* [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
@ 2022-06-27 18:04 Gustavo A. R. Silva
2022-06-27 18:27 ` Daniel Borkmann
` (3 more replies)
0 siblings, 4 replies; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-27 18:04 UTC (permalink / raw)
To: Kees Cook, linux-kernel
Cc: x86, dm-devel, linux-m68k, linux-mips, linux-s390, kvm,
intel-gfx, dri-devel, netdev, bpf, linux-btrfs, linux-can,
linux-fsdevel, linux1394-devel, io-uring, lvs-devel, linux-mtd,
kasan-dev, linux-mmc, nvdimm, netfilter-devel, coreteam,
linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
Gustavo A. R. Silva, linux-hardening
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
This code was transformed with the help of Coccinelle:
(linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
@@
identifier S, member, array;
type T1, T2;
@@
struct S {
...
T1 member;
T2 array[
- 0
];
};
-fstrict-flex-arrays=3 is coming and we need to land these changes
to prevent issues like these in the short future:
../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
but the source string has length 2 (including NUL byte) [-Wfortify-source]
strcpy(de3->name, ".");
^
Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
this breaks anything, we can use a union with a new member name.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/78
Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
Hi all!
JFYI: I'm adding this to my -next tree. :)
arch/m68k/include/uapi/asm/bootinfo.h | 4 +-
arch/mips/include/uapi/asm/ucontext.h | 2 +-
arch/s390/include/uapi/asm/hwctrset.h | 6 +-
arch/x86/include/uapi/asm/bootparam.h | 2 +-
arch/x86/include/uapi/asm/kvm.h | 12 ++--
include/uapi/drm/i915_drm.h | 6 +-
include/uapi/linux/blkzoned.h | 2 +-
include/uapi/linux/bpf.h | 2 +-
include/uapi/linux/btrfs.h | 10 +--
include/uapi/linux/btrfs_tree.h | 2 +-
include/uapi/linux/can/bcm.h | 2 +-
include/uapi/linux/connector.h | 2 +-
include/uapi/linux/cycx_cfm.h | 2 +-
include/uapi/linux/dm-ioctl.h | 8 +--
include/uapi/linux/dm-log-userspace.h | 2 +-
include/uapi/linux/ethtool.h | 28 ++++----
include/uapi/linux/fanotify.h | 2 +-
include/uapi/linux/fiemap.h | 2 +-
include/uapi/linux/firewire-cdev.h | 12 ++--
include/uapi/linux/fs.h | 2 +-
include/uapi/linux/if_alg.h | 2 +-
include/uapi/linux/if_arcnet.h | 6 +-
include/uapi/linux/if_pppox.h | 4 +-
include/uapi/linux/if_tun.h | 2 +-
include/uapi/linux/igmp.h | 6 +-
include/uapi/linux/inet_diag.h | 2 +-
include/uapi/linux/inotify.h | 2 +-
include/uapi/linux/io_uring.h | 2 +-
include/uapi/linux/ip.h | 4 +-
include/uapi/linux/ip_vs.h | 4 +-
include/uapi/linux/iso_fs.h | 4 +-
include/uapi/linux/jffs2.h | 8 +--
include/uapi/linux/kcov.h | 2 +-
include/uapi/linux/kvm.h | 8 +--
include/uapi/linux/minix_fs.h | 4 +-
include/uapi/linux/mmc/ioctl.h | 2 +-
include/uapi/linux/ndctl.h | 10 +--
include/uapi/linux/net_dropmon.h | 4 +-
include/uapi/linux/netfilter/x_tables.h | 4 +-
include/uapi/linux/netfilter_arp/arp_tables.h | 6 +-
.../uapi/linux/netfilter_bridge/ebt_among.h | 2 +-
include/uapi/linux/netfilter_ipv4/ip_tables.h | 6 +-
.../uapi/linux/netfilter_ipv6/ip6_tables.h | 4 +-
include/uapi/linux/perf_event.h | 2 +-
include/uapi/linux/pkt_cls.h | 4 +-
include/uapi/linux/raid/md_p.h | 2 +-
include/uapi/linux/random.h | 2 +-
include/uapi/linux/romfs_fs.h | 4 +-
include/uapi/linux/rtnetlink.h | 2 +-
include/uapi/linux/sctp.h | 10 +--
include/uapi/linux/seg6.h | 2 +-
include/uapi/linux/seg6_iptunnel.h | 2 +-
include/uapi/linux/stm.h | 2 +-
include/uapi/linux/target_core_user.h | 2 +-
include/uapi/linux/usb/audio.h | 2 +-
include/uapi/linux/usb/cdc.h | 6 +-
include/uapi/linux/usb/ch9.h | 2 +-
include/uapi/linux/usb/raw_gadget.h | 4 +-
include/uapi/linux/usbdevice_fs.h | 4 +-
include/uapi/linux/vhost_types.h | 4 +-
include/uapi/linux/virtio_9p.h | 2 +-
include/uapi/linux/xfrm.h | 10 +--
include/uapi/rdma/hfi/hfi1_user.h | 2 +-
include/uapi/rdma/ib_user_verbs.h | 72 +++++++++----------
include/uapi/rdma/rdma_user_cm.h | 2 +-
include/uapi/rdma/rdma_user_ioctl_cmds.h | 2 +-
include/uapi/scsi/fc/fc_els.h | 18 ++---
include/uapi/scsi/scsi_bsg_fc.h | 2 +-
include/uapi/sound/asound.h | 2 +-
include/uapi/sound/firewire.h | 6 +-
include/uapi/sound/skl-tplg-interface.h | 2 +-
| 2 +-
include/uapi/sound/usb_stream.h | 2 +-
tools/arch/x86/include/uapi/asm/kvm.h | 12 ++--
tools/include/uapi/drm/i915_drm.h | 6 +-
tools/include/uapi/linux/bpf.h | 2 +-
tools/include/uapi/linux/fs.h | 2 +-
tools/include/uapi/linux/if_tun.h | 2 +-
tools/include/uapi/linux/kvm.h | 8 +--
tools/include/uapi/linux/perf_event.h | 2 +-
tools/include/uapi/linux/pkt_cls.h | 4 +-
tools/include/uapi/linux/seg6.h | 4 +-
tools/include/uapi/linux/usbdevice_fs.h | 4 +-
tools/include/uapi/sound/asound.h | 2 +-
84 files changed, 218 insertions(+), 218 deletions(-)
diff --git a/arch/m68k/include/uapi/asm/bootinfo.h b/arch/m68k/include/uapi/asm/bootinfo.h
index 203d9cbf9630..95ecf3ae4c49 100644
--- a/arch/m68k/include/uapi/asm/bootinfo.h
+++ b/arch/m68k/include/uapi/asm/bootinfo.h
@@ -34,7 +34,7 @@
struct bi_record {
__be16 tag; /* tag ID */
__be16 size; /* size of record (in bytes) */
- __be32 data[0]; /* data */
+ __be32 data[]; /* data */
};
@@ -168,7 +168,7 @@ struct bootversion {
struct {
__be32 machtype;
__be32 version;
- } machversions[0];
+ } machversions[];
} __packed;
#endif /* __ASSEMBLY__ */
diff --git a/arch/mips/include/uapi/asm/ucontext.h b/arch/mips/include/uapi/asm/ucontext.h
index 2d3bf8eebf1f..6122ef97c6ff 100644
--- a/arch/mips/include/uapi/asm/ucontext.h
+++ b/arch/mips/include/uapi/asm/ucontext.h
@@ -60,7 +60,7 @@ struct ucontext {
sigset_t uc_sigmask;
/* Extended context structures may follow ucontext */
- unsigned long long uc_extcontext[0];
+ unsigned long long uc_extcontext[];
};
#endif /* __MIPS_UAPI_ASM_UCONTEXT_H */
diff --git a/arch/s390/include/uapi/asm/hwctrset.h b/arch/s390/include/uapi/asm/hwctrset.h
index 3d8284b95f87..e56b9dd23a4b 100644
--- a/arch/s390/include/uapi/asm/hwctrset.h
+++ b/arch/s390/include/uapi/asm/hwctrset.h
@@ -30,18 +30,18 @@ struct s390_ctrset_start { /* Set CPUs to operate on */
struct s390_ctrset_setdata { /* Counter set data */
__u32 set; /* Counter set number */
__u32 no_cnts; /* # of counters stored in cv[] */
- __u64 cv[0]; /* Counter values (variable length) */
+ __u64 cv[]; /* Counter values (variable length) */
};
struct s390_ctrset_cpudata { /* Counter set data per CPU */
__u32 cpu_nr; /* CPU number */
__u32 no_sets; /* # of counters sets in data[] */
- struct s390_ctrset_setdata data[0];
+ struct s390_ctrset_setdata data[];
};
struct s390_ctrset_read { /* Structure to get all ctr sets */
__u64 no_cpus; /* Total # of CPUs data taken from */
- struct s390_ctrset_cpudata data[0];
+ struct s390_ctrset_cpudata data[];
};
#define S390_HWCTR_MAGIC 'C' /* Random magic # for ioctls */
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index bea5cdcdf532..cdd6c7f6cfa6 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -52,7 +52,7 @@ struct setup_data {
__u64 next;
__u32 type;
__u32 len;
- __u8 data[0];
+ __u8 data[];
};
/* extensible setup indirect data node */
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 21614807a2cb..ec53c9fa1da9 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -198,13 +198,13 @@ struct kvm_msrs {
__u32 nmsrs; /* number of msrs in entries */
__u32 pad;
- struct kvm_msr_entry entries[0];
+ struct kvm_msr_entry entries[];
};
/* for KVM_GET_MSR_INDEX_LIST */
struct kvm_msr_list {
__u32 nmsrs; /* number of msrs in entries */
- __u32 indices[0];
+ __u32 indices[];
};
/* Maximum size of any access bitmap in bytes */
@@ -241,7 +241,7 @@ struct kvm_cpuid_entry {
struct kvm_cpuid {
__u32 nent;
__u32 padding;
- struct kvm_cpuid_entry entries[0];
+ struct kvm_cpuid_entry entries[];
};
struct kvm_cpuid_entry2 {
@@ -263,7 +263,7 @@ struct kvm_cpuid_entry2 {
struct kvm_cpuid2 {
__u32 nent;
__u32 padding;
- struct kvm_cpuid_entry2 entries[0];
+ struct kvm_cpuid_entry2 entries[];
};
/* for KVM_GET_PIT and KVM_SET_PIT */
@@ -389,7 +389,7 @@ struct kvm_xsave {
* the contents of CPUID leaf 0xD on the host.
*/
__u32 region[1024];
- __u32 extra[0];
+ __u32 extra[];
};
#define KVM_MAX_XCRS 16
@@ -516,7 +516,7 @@ struct kvm_pmu_event_filter {
__u32 fixed_counter_bitmap;
__u32 flags;
__u32 pad[4];
- __u64 events[0];
+ __u64 events[];
};
#define KVM_PMU_EVENT_ALLOW 0
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index a2def7b27009..b28ff5d88145 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2123,7 +2123,7 @@ struct i915_context_engines_load_balance {
__u64 mbz64; /* reserved for future use; must be zero */
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __attribute__((packed));
#define I915_DEFINE_CONTEXT_ENGINES_LOAD_BALANCE(name__, N__) struct { \
@@ -2161,7 +2161,7 @@ struct i915_context_engines_bond {
__u64 flags; /* all undefined flags must be zero */
__u64 mbz64[4]; /* reserved for future use; must be zero */
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __attribute__((packed));
#define I915_DEFINE_CONTEXT_ENGINES_BOND(name__, N__) struct { \
@@ -2288,7 +2288,7 @@ struct i915_context_engines_parallel_submit {
* length = width (i) * num_siblings (j)
* index = j + i * num_siblings
*/
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __packed;
diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzoned.h
index 656a326821a2..b80fcc9ea525 100644
--- a/include/uapi/linux/blkzoned.h
+++ b/include/uapi/linux/blkzoned.h
@@ -130,7 +130,7 @@ struct blk_zone_report {
__u64 sector;
__u32 nr_zones;
__u32 flags;
- struct blk_zone zones[0];
+ struct blk_zone zones[];
};
/**
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index f4009dbdf62d..e4b33ba06f00 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -79,7 +79,7 @@ struct bpf_insn {
/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
struct bpf_lpm_trie_key {
__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
- __u8 data[0]; /* Arbitrary size */
+ __u8 data[]; /* Arbitrary size */
};
struct bpf_cgroup_storage_key {
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index d956b2993970..3d0edbe3b991 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -93,7 +93,7 @@ struct btrfs_qgroup_inherit {
__u64 num_ref_copies;
__u64 num_excl_copies;
struct btrfs_qgroup_limit lim;
- __u64 qgroups[0];
+ __u64 qgroups[];
};
struct btrfs_ioctl_qgroup_limit_args {
@@ -561,7 +561,7 @@ struct btrfs_ioctl_search_args_v2 {
__u64 buf_size; /* in - size of buffer
* out - on EOVERFLOW: needed size
* to store item */
- __u64 buf[0]; /* out - found items */
+ __u64 buf[]; /* out - found items */
};
struct btrfs_ioctl_clone_range_args {
@@ -632,7 +632,7 @@ struct btrfs_ioctl_same_args {
__u16 dest_count; /* in - total elements in info array */
__u16 reserved1;
__u32 reserved2;
- struct btrfs_ioctl_same_extent_info info[0];
+ struct btrfs_ioctl_same_extent_info info[];
};
struct btrfs_ioctl_space_info {
@@ -644,7 +644,7 @@ struct btrfs_ioctl_space_info {
struct btrfs_ioctl_space_args {
__u64 space_slots;
__u64 total_spaces;
- struct btrfs_ioctl_space_info spaces[0];
+ struct btrfs_ioctl_space_info spaces[];
};
struct btrfs_data_container {
@@ -652,7 +652,7 @@ struct btrfs_data_container {
__u32 bytes_missing; /* out -- additional bytes needed for result */
__u32 elem_cnt; /* out */
__u32 elem_missed; /* out */
- __u64 val[0]; /* out */
+ __u64 val[]; /* out */
};
struct btrfs_ioctl_ino_path_args {
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index d4117152d907..5f32a2a495dc 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -575,7 +575,7 @@ struct btrfs_inode_extref {
__le64 parent_objectid;
__le64 index;
__le16 name_len;
- __u8 name[0];
+ __u8 name[];
/* name goes here */
} __attribute__ ((__packed__));
diff --git a/include/uapi/linux/can/bcm.h b/include/uapi/linux/can/bcm.h
index dd2b925b09ac..f1e45f533a72 100644
--- a/include/uapi/linux/can/bcm.h
+++ b/include/uapi/linux/can/bcm.h
@@ -71,7 +71,7 @@ struct bcm_msg_head {
struct bcm_timeval ival1, ival2;
canid_t can_id;
__u32 nframes;
- struct can_frame frames[0];
+ struct can_frame frames[];
};
enum {
diff --git a/include/uapi/linux/connector.h b/include/uapi/linux/connector.h
index 3738936149a2..5ae131c3f145 100644
--- a/include/uapi/linux/connector.h
+++ b/include/uapi/linux/connector.h
@@ -75,7 +75,7 @@ struct cn_msg {
__u16 len; /* Length of the following data */
__u16 flags;
- __u8 data[0];
+ __u8 data[];
};
#endif /* _UAPI__CONNECTOR_H */
diff --git a/include/uapi/linux/cycx_cfm.h b/include/uapi/linux/cycx_cfm.h
index 51f541942ff9..91778c8024b1 100644
--- a/include/uapi/linux/cycx_cfm.h
+++ b/include/uapi/linux/cycx_cfm.h
@@ -91,7 +91,7 @@ struct cycx_firmware {
unsigned short reserved[6];
char descr[CFM_DESCR_LEN];
struct cycx_fw_info info;
- unsigned char image[0];
+ unsigned char image[];
};
struct cycx_fw_header {
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 2e9550fef90f..8c97d75f3104 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -182,7 +182,7 @@ struct dm_target_spec {
struct dm_target_deps {
__u32 count; /* Array size */
__u32 padding; /* unused */
- __u64 dev[0]; /* out */
+ __u64 dev[]; /* out */
};
/*
@@ -192,7 +192,7 @@ struct dm_name_list {
__u64 dev;
__u32 next; /* offset to the next record from
the _start_ of this */
- char name[0];
+ char name[];
/*
* The following members can be accessed by taking a pointer that
@@ -216,7 +216,7 @@ struct dm_target_versions {
__u32 next;
__u32 version[3];
- char name[0];
+ char name[];
};
/*
@@ -225,7 +225,7 @@ struct dm_target_versions {
struct dm_target_msg {
__u64 sector; /* Device sector */
- char message[0];
+ char message[];
};
/*
diff --git a/include/uapi/linux/dm-log-userspace.h b/include/uapi/linux/dm-log-userspace.h
index 5c47a8603376..23dad9565e46 100644
--- a/include/uapi/linux/dm-log-userspace.h
+++ b/include/uapi/linux/dm-log-userspace.h
@@ -426,7 +426,7 @@ struct dm_ulog_request {
__u32 request_type; /* DM_ULOG_* defined above */
__u32 data_size; /* How much data (not including this struct) */
- char data[0];
+ char data[];
};
#endif /* __DM_LOG_USERSPACE_H__ */
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index e0f0ee9bc89e..2d5741fd44bb 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -257,7 +257,7 @@ struct ethtool_tunable {
__u32 id;
__u32 type_id;
__u32 len;
- void *data[0];
+ void *data[];
};
#define DOWNSHIFT_DEV_DEFAULT_COUNT 0xff
@@ -322,7 +322,7 @@ struct ethtool_regs {
__u32 cmd;
__u32 version;
__u32 len;
- __u8 data[0];
+ __u8 data[];
};
/**
@@ -348,7 +348,7 @@ struct ethtool_eeprom {
__u32 magic;
__u32 offset;
__u32 len;
- __u8 data[0];
+ __u8 data[];
};
/**
@@ -752,7 +752,7 @@ struct ethtool_gstrings {
__u32 cmd;
__u32 string_set;
__u32 len;
- __u8 data[0];
+ __u8 data[];
};
/**
@@ -777,7 +777,7 @@ struct ethtool_sset_info {
__u32 cmd;
__u32 reserved;
__u64 sset_mask;
- __u32 data[0];
+ __u32 data[];
};
/**
@@ -817,7 +817,7 @@ struct ethtool_test {
__u32 flags;
__u32 reserved;
__u32 len;
- __u64 data[0];
+ __u64 data[];
};
/**
@@ -834,7 +834,7 @@ struct ethtool_test {
struct ethtool_stats {
__u32 cmd;
__u32 n_stats;
- __u64 data[0];
+ __u64 data[];
};
/**
@@ -851,7 +851,7 @@ struct ethtool_stats {
struct ethtool_perm_addr {
__u32 cmd;
__u32 size;
- __u8 data[0];
+ __u8 data[];
};
/* boolean flags controlling per-interface behavior characteristics.
@@ -1160,7 +1160,7 @@ struct ethtool_rxnfc {
struct ethtool_rxfh_indir {
__u32 cmd;
__u32 size;
- __u32 ring_index[0];
+ __u32 ring_index[];
};
/**
@@ -1201,7 +1201,7 @@ struct ethtool_rxfh {
__u8 hfunc;
__u8 rsvd8[3];
__u32 rsvd32;
- __u32 rss_config[0];
+ __u32 rss_config[];
};
#define ETH_RXFH_CONTEXT_ALLOC 0xffffffff
#define ETH_RXFH_INDIR_NO_CHANGE 0xffffffff
@@ -1286,7 +1286,7 @@ struct ethtool_dump {
__u32 version;
__u32 flag;
__u32 len;
- __u8 data[0];
+ __u8 data[];
};
#define ETH_FW_DUMP_DISABLE 0
@@ -1318,7 +1318,7 @@ struct ethtool_get_features_block {
struct ethtool_gfeatures {
__u32 cmd;
__u32 size;
- struct ethtool_get_features_block features[0];
+ struct ethtool_get_features_block features[];
};
/**
@@ -1340,7 +1340,7 @@ struct ethtool_set_features_block {
struct ethtool_sfeatures {
__u32 cmd;
__u32 size;
- struct ethtool_set_features_block features[0];
+ struct ethtool_set_features_block features[];
};
/**
@@ -2087,7 +2087,7 @@ struct ethtool_link_settings {
__u8 master_slave_state;
__u8 reserved1[1];
__u32 reserved[7];
- __u32 link_mode_masks[0];
+ __u32 link_mode_masks[];
/* layout of link_mode_masks fields:
* __u32 map_supported[link_mode_masks_nwords];
* __u32 map_advertising[link_mode_masks_nwords];
diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index f1f89132d60e..197df344307d 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -162,7 +162,7 @@ struct fanotify_event_info_fid {
* Following is an opaque struct file_handle that can be passed as
* an argument to open_by_handle_at(2).
*/
- unsigned char handle[0];
+ unsigned char handle[];
};
/*
diff --git a/include/uapi/linux/fiemap.h b/include/uapi/linux/fiemap.h
index 07c1cdcb715e..24ca0c00cae3 100644
--- a/include/uapi/linux/fiemap.h
+++ b/include/uapi/linux/fiemap.h
@@ -34,7 +34,7 @@ struct fiemap {
__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
__u32 fm_extent_count; /* size of fm_extents array (in) */
__u32 fm_reserved;
- struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
+ struct fiemap_extent fm_extents[]; /* array of mapped extents (out) */
};
#define FIEMAP_MAX_OFFSET (~0ULL)
diff --git a/include/uapi/linux/firewire-cdev.h b/include/uapi/linux/firewire-cdev.h
index 5effa9832802..92be3ea3c6e0 100644
--- a/include/uapi/linux/firewire-cdev.h
+++ b/include/uapi/linux/firewire-cdev.h
@@ -118,7 +118,7 @@ struct fw_cdev_event_response {
__u32 type;
__u32 rcode;
__u32 length;
- __u32 data[0];
+ __u32 data[];
};
/**
@@ -142,7 +142,7 @@ struct fw_cdev_event_request {
__u64 offset;
__u32 handle;
__u32 length;
- __u32 data[0];
+ __u32 data[];
};
/**
@@ -205,7 +205,7 @@ struct fw_cdev_event_request2 {
__u32 generation;
__u32 handle;
__u32 length;
- __u32 data[0];
+ __u32 data[];
};
/**
@@ -265,7 +265,7 @@ struct fw_cdev_event_iso_interrupt {
__u32 type;
__u32 cycle;
__u32 header_length;
- __u32 header[0];
+ __u32 header[];
};
/**
@@ -355,7 +355,7 @@ struct fw_cdev_event_phy_packet {
__u32 type;
__u32 rcode;
__u32 length;
- __u32 data[0];
+ __u32 data[];
};
/**
@@ -803,7 +803,7 @@ struct fw_cdev_set_iso_channels {
*/
struct fw_cdev_iso_packet {
__u32 control;
- __u32 header[0];
+ __u32 header[];
};
/**
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index bdf7b404b3e7..b7b56871029c 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -90,7 +90,7 @@ struct file_dedupe_range {
__u16 dest_count; /* in - total elements in info array */
__u16 reserved1; /* must be zero */
__u32 reserved2; /* must be zero */
- struct file_dedupe_range_info info[0];
+ struct file_dedupe_range_info info[];
};
/* And dynamically-tunable limits and defaults: */
diff --git a/include/uapi/linux/if_alg.h b/include/uapi/linux/if_alg.h
index dc52a11ba6d1..578b18aab821 100644
--- a/include/uapi/linux/if_alg.h
+++ b/include/uapi/linux/if_alg.h
@@ -42,7 +42,7 @@ struct sockaddr_alg_new {
struct af_alg_iv {
__u32 ivlen;
- __u8 iv[0];
+ __u8 iv[];
};
/* Socket options */
diff --git a/include/uapi/linux/if_arcnet.h b/include/uapi/linux/if_arcnet.h
index 683878036d76..b122cfac7128 100644
--- a/include/uapi/linux/if_arcnet.h
+++ b/include/uapi/linux/if_arcnet.h
@@ -60,7 +60,7 @@ struct arc_rfc1201 {
__u8 proto; /* protocol ID field - varies */
__u8 split_flag; /* for use with split packets */
__be16 sequence; /* sequence number */
- __u8 payload[0]; /* space remaining in packet (504 bytes)*/
+ __u8 payload[]; /* space remaining in packet (504 bytes)*/
};
#define RFC1201_HDR_SIZE 4
@@ -69,7 +69,7 @@ struct arc_rfc1201 {
*/
struct arc_rfc1051 {
__u8 proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */
- __u8 payload[0]; /* 507 bytes */
+ __u8 payload[]; /* 507 bytes */
};
#define RFC1051_HDR_SIZE 1
@@ -80,7 +80,7 @@ struct arc_rfc1051 {
struct arc_eth_encap {
__u8 proto; /* Always ARC_P_ETHER */
struct ethhdr eth; /* standard ethernet header (yuck!) */
- __u8 payload[0]; /* 493 bytes */
+ __u8 payload[]; /* 493 bytes */
};
#define ETH_ENCAP_HDR_SIZE 14
diff --git a/include/uapi/linux/if_pppox.h b/include/uapi/linux/if_pppox.h
index e7a693c28f16..9abd80dcc46f 100644
--- a/include/uapi/linux/if_pppox.h
+++ b/include/uapi/linux/if_pppox.h
@@ -122,7 +122,7 @@ struct sockaddr_pppol2tpv3in6 {
struct pppoe_tag {
__be16 tag_type;
__be16 tag_len;
- char tag_data[0];
+ char tag_data[];
} __attribute__ ((packed));
/* Tag identifiers */
@@ -150,7 +150,7 @@ struct pppoe_hdr {
__u8 code;
__be16 sid;
__be16 length;
- struct pppoe_tag tag[0];
+ struct pppoe_tag tag[];
} __packed;
/* Length of entire PPPoE + PPP header */
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 454ae31b93c7..2ec07de1d73b 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -108,7 +108,7 @@ struct tun_pi {
struct tun_filter {
__u16 flags; /* TUN_FLT_ flags see above */
__u16 count; /* Number of addresses */
- __u8 addr[0][ETH_ALEN];
+ __u8 addr[][ETH_ALEN];
};
#endif /* _UAPI__IF_TUN_H */
diff --git a/include/uapi/linux/igmp.h b/include/uapi/linux/igmp.h
index 90c28bc466c6..5930f2437cd1 100644
--- a/include/uapi/linux/igmp.h
+++ b/include/uapi/linux/igmp.h
@@ -48,7 +48,7 @@ struct igmpv3_grec {
__u8 grec_auxwords;
__be16 grec_nsrcs;
__be32 grec_mca;
- __be32 grec_src[0];
+ __be32 grec_src[];
};
struct igmpv3_report {
@@ -57,7 +57,7 @@ struct igmpv3_report {
__sum16 csum;
__be16 resv2;
__be16 ngrec;
- struct igmpv3_grec grec[0];
+ struct igmpv3_grec grec[];
};
struct igmpv3_query {
@@ -78,7 +78,7 @@ struct igmpv3_query {
#endif
__u8 qqic;
__be16 nsrcs;
- __be32 srcs[0];
+ __be32 srcs[];
};
#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */
diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index 20ee93f0f876..50655de04c9b 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -104,7 +104,7 @@ struct inet_diag_hostcond {
__u8 family;
__u8 prefix_len;
int port;
- __be32 addr[0];
+ __be32 addr[];
};
struct inet_diag_markcond {
diff --git a/include/uapi/linux/inotify.h b/include/uapi/linux/inotify.h
index 884b4846b630..b3e165853d5b 100644
--- a/include/uapi/linux/inotify.h
+++ b/include/uapi/linux/inotify.h
@@ -23,7 +23,7 @@ struct inotify_event {
__u32 mask; /* watch mask */
__u32 cookie; /* cookie to synchronize two events */
__u32 len; /* length (including nulls) of name */
- char name[0]; /* stub for possible name */
+ char name[]; /* stub for possible name */
};
/* the following are legal, implemented events that user-space can watch for */
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 776e0278f9dd..7822ef9d8628 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -486,7 +486,7 @@ struct io_uring_probe {
__u8 ops_len; /* length of ops[] array below */
__u16 resv;
__u32 resv2[3];
- struct io_uring_probe_op ops[0];
+ struct io_uring_probe_op ops[];
};
struct io_uring_restriction {
diff --git a/include/uapi/linux/ip.h b/include/uapi/linux/ip.h
index e00bbb9c47bb..961ec16a26b8 100644
--- a/include/uapi/linux/ip.h
+++ b/include/uapi/linux/ip.h
@@ -112,13 +112,13 @@ struct ip_auth_hdr {
__be16 reserved;
__be32 spi;
__be32 seq_no; /* Sequence number */
- __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
+ __u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */
};
struct ip_esp_hdr {
__be32 spi;
__be32 seq_no; /* Sequence number */
- __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
+ __u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */
};
struct ip_comp_hdr {
diff --git a/include/uapi/linux/ip_vs.h b/include/uapi/linux/ip_vs.h
index 4102ddcb4e14..1ed234e7f251 100644
--- a/include/uapi/linux/ip_vs.h
+++ b/include/uapi/linux/ip_vs.h
@@ -254,7 +254,7 @@ struct ip_vs_get_dests {
unsigned int num_dests;
/* the real servers */
- struct ip_vs_dest_entry entrytable[0];
+ struct ip_vs_dest_entry entrytable[];
};
@@ -264,7 +264,7 @@ struct ip_vs_get_services {
unsigned int num_services;
/* service table */
- struct ip_vs_service_entry entrytable[0];
+ struct ip_vs_service_entry entrytable[];
};
diff --git a/include/uapi/linux/iso_fs.h b/include/uapi/linux/iso_fs.h
index a2555176f6d1..758178f5b52d 100644
--- a/include/uapi/linux/iso_fs.h
+++ b/include/uapi/linux/iso_fs.h
@@ -137,7 +137,7 @@ struct iso_path_table{
__u8 name_len[2]; /* 721 */
__u8 extent[4]; /* 731 */
__u8 parent[2]; /* 721 */
- char name[0];
+ char name[];
} __attribute__((packed));
/* high sierra is identical to iso, except that the date is only 6 bytes, and
@@ -154,7 +154,7 @@ struct iso_directory_record {
__u8 interleave [ISODCL (28, 28)]; /* 711 */
__u8 volume_sequence_number [ISODCL (29, 32)]; /* 723 */
__u8 name_len [ISODCL (33, 33)]; /* 711 */
- char name [0];
+ char name [];
} __attribute__((packed));
#define ISOFS_BLOCK_BITS 11
diff --git a/include/uapi/linux/jffs2.h b/include/uapi/linux/jffs2.h
index 784ba0b9690a..637ee4a793cf 100644
--- a/include/uapi/linux/jffs2.h
+++ b/include/uapi/linux/jffs2.h
@@ -123,7 +123,7 @@ struct jffs2_raw_dirent
__u8 unused[2];
jint32_t node_crc;
jint32_t name_crc;
- __u8 name[0];
+ __u8 name[];
};
/* The JFFS2 raw inode structure: Used for storage on physical media. */
@@ -155,7 +155,7 @@ struct jffs2_raw_inode
jint16_t flags; /* See JFFS2_INO_FLAG_* */
jint32_t data_crc; /* CRC for the (compressed) data. */
jint32_t node_crc; /* CRC for the raw inode (excluding data) */
- __u8 data[0];
+ __u8 data[];
};
struct jffs2_raw_xattr {
@@ -170,7 +170,7 @@ struct jffs2_raw_xattr {
jint16_t value_len;
jint32_t data_crc;
jint32_t node_crc;
- __u8 data[0];
+ __u8 data[];
} __attribute__((packed));
struct jffs2_raw_xref
@@ -196,7 +196,7 @@ struct jffs2_raw_summary
jint32_t padded; /* sum of the size of padding nodes */
jint32_t sum_crc; /* summary information crc */
jint32_t node_crc; /* node crc */
- jint32_t sum[0]; /* inode summary info */
+ jint32_t sum[]; /* inode summary info */
};
union jffs2_node_union
diff --git a/include/uapi/linux/kcov.h b/include/uapi/linux/kcov.h
index 1d0350e44ae3..ed95dba9fa37 100644
--- a/include/uapi/linux/kcov.h
+++ b/include/uapi/linux/kcov.h
@@ -13,7 +13,7 @@ struct kcov_remote_arg {
__u32 area_size; /* Length of coverage buffer in words */
__u32 num_handles; /* Size of handles array */
__aligned_u64 common_handle;
- __aligned_u64 handles[0];
+ __aligned_u64 handles[];
};
#define KCOV_REMOTE_MAX_HANDLES 0x100
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 5088bd9f1922..74dc8bafcb9e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -542,7 +542,7 @@ struct kvm_coalesced_mmio {
struct kvm_coalesced_mmio_ring {
__u32 first, last;
- struct kvm_coalesced_mmio coalesced_mmio[0];
+ struct kvm_coalesced_mmio coalesced_mmio[];
};
#define KVM_COALESCED_MMIO_MAX \
@@ -621,7 +621,7 @@ struct kvm_clear_dirty_log {
/* for KVM_SET_SIGNAL_MASK */
struct kvm_signal_mask {
__u32 len;
- __u8 sigset[0];
+ __u8 sigset[];
};
/* for KVM_TPR_ACCESS_REPORTING */
@@ -1221,7 +1221,7 @@ struct kvm_irq_routing_entry {
struct kvm_irq_routing {
__u32 nr;
__u32 flags;
- struct kvm_irq_routing_entry entries[0];
+ struct kvm_irq_routing_entry entries[];
};
#endif
@@ -1341,7 +1341,7 @@ struct kvm_dirty_tlb {
struct kvm_reg_list {
__u64 n; /* number of regs */
- __u64 reg[0];
+ __u64 reg[];
};
struct kvm_one_reg {
diff --git a/include/uapi/linux/minix_fs.h b/include/uapi/linux/minix_fs.h
index 95dbcb17eacd..8d9ca8b2c357 100644
--- a/include/uapi/linux/minix_fs.h
+++ b/include/uapi/linux/minix_fs.h
@@ -97,11 +97,11 @@ struct minix3_super_block {
struct minix_dir_entry {
__u16 inode;
- char name[0];
+ char name[];
};
struct minix3_dir_entry {
__u32 inode;
- char name[0];
+ char name[];
};
#endif
diff --git a/include/uapi/linux/mmc/ioctl.h b/include/uapi/linux/mmc/ioctl.h
index 27a39847d55c..e7401ade6822 100644
--- a/include/uapi/linux/mmc/ioctl.h
+++ b/include/uapi/linux/mmc/ioctl.h
@@ -58,7 +58,7 @@ struct mmc_ioc_cmd {
*/
struct mmc_ioc_multi_cmd {
__u64 num_of_cmds;
- struct mmc_ioc_cmd cmds[0];
+ struct mmc_ioc_cmd cmds[];
};
#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index 17e02b64ea2e..73516e263627 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -30,25 +30,25 @@ struct nd_cmd_get_config_data_hdr {
__u32 in_offset;
__u32 in_length;
__u32 status;
- __u8 out_buf[0];
+ __u8 out_buf[];
} __packed;
struct nd_cmd_set_config_hdr {
__u32 in_offset;
__u32 in_length;
- __u8 in_buf[0];
+ __u8 in_buf[];
} __packed;
struct nd_cmd_vendor_hdr {
__u32 opcode;
__u32 in_length;
- __u8 in_buf[0];
+ __u8 in_buf[];
} __packed;
struct nd_cmd_vendor_tail {
__u32 status;
__u32 out_length;
- __u8 out_buf[0];
+ __u8 out_buf[];
} __packed;
struct nd_cmd_ars_cap {
@@ -86,7 +86,7 @@ struct nd_cmd_ars_status {
__u32 reserved;
__u64 err_address;
__u64 length;
- } __packed records[0];
+ } __packed records[];
} __packed;
struct nd_cmd_clear_error {
diff --git a/include/uapi/linux/net_dropmon.h b/include/uapi/linux/net_dropmon.h
index 1bbea8f0681e..84f622a66a7a 100644
--- a/include/uapi/linux/net_dropmon.h
+++ b/include/uapi/linux/net_dropmon.h
@@ -29,12 +29,12 @@ struct net_dm_config_entry {
struct net_dm_config_msg {
__u32 entries;
- struct net_dm_config_entry options[0];
+ struct net_dm_config_entry options[];
};
struct net_dm_alert_msg {
__u32 entries;
- struct net_dm_drop_point points[0];
+ struct net_dm_drop_point points[];
};
struct net_dm_user_msg {
diff --git a/include/uapi/linux/netfilter/x_tables.h b/include/uapi/linux/netfilter/x_tables.h
index b8c6bb233ac1..796af83a963a 100644
--- a/include/uapi/linux/netfilter/x_tables.h
+++ b/include/uapi/linux/netfilter/x_tables.h
@@ -28,7 +28,7 @@ struct xt_entry_match {
__u16 match_size;
} u;
- unsigned char data[0];
+ unsigned char data[];
};
struct xt_entry_target {
@@ -119,7 +119,7 @@ struct xt_counters_info {
unsigned int num_counters;
/* The counters (actually `number' of these). */
- struct xt_counters counters[0];
+ struct xt_counters counters[];
};
#define XT_INV_PROTO 0x40 /* Invert the sense of PROTO. */
diff --git a/include/uapi/linux/netfilter_arp/arp_tables.h b/include/uapi/linux/netfilter_arp/arp_tables.h
index bbf5af2b67a8..a6ac2463f787 100644
--- a/include/uapi/linux/netfilter_arp/arp_tables.h
+++ b/include/uapi/linux/netfilter_arp/arp_tables.h
@@ -109,7 +109,7 @@ struct arpt_entry
struct xt_counters counters;
/* The matches (if any), then the target. */
- unsigned char elems[0];
+ unsigned char elems[];
};
/*
@@ -181,7 +181,7 @@ struct arpt_replace {
struct xt_counters __user *counters;
/* The entries (hang off end: not really an array). */
- struct arpt_entry entries[0];
+ struct arpt_entry entries[];
};
/* The argument to ARPT_SO_GET_ENTRIES. */
@@ -193,7 +193,7 @@ struct arpt_get_entries {
unsigned int size;
/* The entries. */
- struct arpt_entry entrytable[0];
+ struct arpt_entry entrytable[];
};
/* Helper functions */
diff --git a/include/uapi/linux/netfilter_bridge/ebt_among.h b/include/uapi/linux/netfilter_bridge/ebt_among.h
index 9acf757bc1f7..73b26a280c4f 100644
--- a/include/uapi/linux/netfilter_bridge/ebt_among.h
+++ b/include/uapi/linux/netfilter_bridge/ebt_among.h
@@ -40,7 +40,7 @@ struct ebt_mac_wormhash_tuple {
struct ebt_mac_wormhash {
int table[257];
int poolsize;
- struct ebt_mac_wormhash_tuple pool[0];
+ struct ebt_mac_wormhash_tuple pool[];
};
#define ebt_mac_wormhash_size(x) ((x) ? sizeof(struct ebt_mac_wormhash) \
diff --git a/include/uapi/linux/netfilter_ipv4/ip_tables.h b/include/uapi/linux/netfilter_ipv4/ip_tables.h
index 50c7fee625ae..1485df28b239 100644
--- a/include/uapi/linux/netfilter_ipv4/ip_tables.h
+++ b/include/uapi/linux/netfilter_ipv4/ip_tables.h
@@ -121,7 +121,7 @@ struct ipt_entry {
struct xt_counters counters;
/* The matches (if any), then the target. */
- unsigned char elems[0];
+ unsigned char elems[];
};
/*
@@ -203,7 +203,7 @@ struct ipt_replace {
struct xt_counters __user *counters;
/* The entries (hang off end: not really an array). */
- struct ipt_entry entries[0];
+ struct ipt_entry entries[];
};
/* The argument to IPT_SO_GET_ENTRIES. */
@@ -215,7 +215,7 @@ struct ipt_get_entries {
unsigned int size;
/* The entries. */
- struct ipt_entry entrytable[0];
+ struct ipt_entry entrytable[];
};
/* Helper functions */
diff --git a/include/uapi/linux/netfilter_ipv6/ip6_tables.h b/include/uapi/linux/netfilter_ipv6/ip6_tables.h
index d9e364f96a5c..766e8e0bcc68 100644
--- a/include/uapi/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/uapi/linux/netfilter_ipv6/ip6_tables.h
@@ -243,7 +243,7 @@ struct ip6t_replace {
struct xt_counters __user *counters;
/* The entries (hang off end: not really an array). */
- struct ip6t_entry entries[0];
+ struct ip6t_entry entries[];
};
/* The argument to IP6T_SO_GET_ENTRIES. */
@@ -255,7 +255,7 @@ struct ip6t_get_entries {
unsigned int size;
/* The entries. */
- struct ip6t_entry entrytable[0];
+ struct ip6t_entry entrytable[];
};
/* Helper functions */
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index d37629dbad72..4653834f078f 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -491,7 +491,7 @@ struct perf_event_query_bpf {
/*
* User provided buffer to store program ids
*/
- __u32 ids[0];
+ __u32 ids[];
};
/*
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 9a2ee1e39fad..ffbe230ef90b 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -256,7 +256,7 @@ struct tc_u32_sel {
short hoff;
__be32 hmask;
- struct tc_u32_key keys[0];
+ struct tc_u32_key keys[];
};
struct tc_u32_mark {
@@ -268,7 +268,7 @@ struct tc_u32_mark {
struct tc_u32_pcnt {
__u64 rcnt;
__u64 rhit;
- __u64 kcnts[0];
+ __u64 kcnts[];
};
/* Flags */
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h
index e5a98a16f9b0..6c0aa577730f 100644
--- a/include/uapi/linux/raid/md_p.h
+++ b/include/uapi/linux/raid/md_p.h
@@ -303,7 +303,7 @@ struct mdp_superblock_1 {
* into the 'roles' value. If a device is spare or faulty, then it doesn't
* have a meaningful role.
*/
- __le16 dev_roles[0]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
+ __le16 dev_roles[]; /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
};
/* feature_map bits */
diff --git a/include/uapi/linux/random.h b/include/uapi/linux/random.h
index dcc1b3e6106f..e744c23582eb 100644
--- a/include/uapi/linux/random.h
+++ b/include/uapi/linux/random.h
@@ -41,7 +41,7 @@
struct rand_pool_info {
int entropy_count;
int buf_size;
- __u32 buf[0];
+ __u32 buf[];
};
/*
diff --git a/include/uapi/linux/romfs_fs.h b/include/uapi/linux/romfs_fs.h
index a7f1585accef..6aa05e792454 100644
--- a/include/uapi/linux/romfs_fs.h
+++ b/include/uapi/linux/romfs_fs.h
@@ -27,7 +27,7 @@ struct romfs_super_block {
__be32 word1;
__be32 size;
__be32 checksum;
- char name[0]; /* volume name */
+ char name[]; /* volume name */
};
/* On disk inode */
@@ -37,7 +37,7 @@ struct romfs_inode {
__be32 spec;
__be32 size;
__be32 checksum;
- char name[0];
+ char name[];
};
#define ROMFH_TYPE 7
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 83849a37db5b..eb2747d58a81 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -440,7 +440,7 @@ struct rtnexthop {
/* RTA_VIA */
struct rtvia {
__kernel_sa_family_t rtvia_family;
- __u8 rtvia_addr[0];
+ __u8 rtvia_addr[];
};
/* RTM_CACHEINFO */
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index c4ff1ebd8bcc..ed7d4ecbf53d 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -365,7 +365,7 @@ struct sctp_assoc_change {
__u16 sac_outbound_streams;
__u16 sac_inbound_streams;
sctp_assoc_t sac_assoc_id;
- __u8 sac_info[0];
+ __u8 sac_info[];
};
/*
@@ -436,7 +436,7 @@ struct sctp_remote_error {
__u32 sre_length;
__be16 sre_error;
sctp_assoc_t sre_assoc_id;
- __u8 sre_data[0];
+ __u8 sre_data[];
};
@@ -453,7 +453,7 @@ struct sctp_send_failed {
__u32 ssf_error;
struct sctp_sndrcvinfo ssf_info;
sctp_assoc_t ssf_assoc_id;
- __u8 ssf_data[0];
+ __u8 ssf_data[];
};
struct sctp_send_failed_event {
@@ -463,7 +463,7 @@ struct sctp_send_failed_event {
__u32 ssf_error;
struct sctp_sndinfo ssfe_info;
sctp_assoc_t ssf_assoc_id;
- __u8 ssf_data[0];
+ __u8 ssf_data[];
};
/*
@@ -1029,7 +1029,7 @@ struct sctp_getaddrs_old {
struct sctp_getaddrs {
sctp_assoc_t assoc_id; /*input*/
__u32 addr_num; /*output*/
- __u8 addrs[0]; /*output, variable size*/
+ __u8 addrs[]; /*output, variable size*/
};
/* A socket user request obtained via SCTP_GET_ASSOC_STATS that retrieves
diff --git a/include/uapi/linux/seg6.h b/include/uapi/linux/seg6.h
index 286e8d6a8e98..13bcbc8bba32 100644
--- a/include/uapi/linux/seg6.h
+++ b/include/uapi/linux/seg6.h
@@ -30,7 +30,7 @@ struct ipv6_sr_hdr {
__u8 flags;
__u16 tag;
- struct in6_addr segments[0];
+ struct in6_addr segments[];
};
#define SR6_FLAG1_PROTECTED (1 << 6)
diff --git a/include/uapi/linux/seg6_iptunnel.h b/include/uapi/linux/seg6_iptunnel.h
index eb815e0d0ac3..a74294211290 100644
--- a/include/uapi/linux/seg6_iptunnel.h
+++ b/include/uapi/linux/seg6_iptunnel.h
@@ -26,7 +26,7 @@ enum {
struct seg6_iptunnel_encap {
int mode;
- struct ipv6_sr_hdr srh[0];
+ struct ipv6_sr_hdr srh[];
};
#define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))
diff --git a/include/uapi/linux/stm.h b/include/uapi/linux/stm.h
index 7bac318b4440..de3579c2cff0 100644
--- a/include/uapi/linux/stm.h
+++ b/include/uapi/linux/stm.h
@@ -36,7 +36,7 @@ struct stp_policy_id {
/* padding */
__u16 __reserved_0;
__u32 __reserved_1;
- char id[0];
+ char id[];
};
#define STP_POLICY_ID_SET _IOWR('%', 0, struct stp_policy_id)
diff --git a/include/uapi/linux/target_core_user.h b/include/uapi/linux/target_core_user.h
index 27ace512babd..fbd8ca67e107 100644
--- a/include/uapi/linux/target_core_user.h
+++ b/include/uapi/linux/target_core_user.h
@@ -152,7 +152,7 @@ struct tcmu_tmr_entry {
__u32 cmd_cnt;
__u64 __pad3;
__u64 __pad4;
- __u16 cmd_ids[0];
+ __u16 cmd_ids[];
} __packed;
#define TCMU_OP_ALIGN_SIZE sizeof(__u64)
diff --git a/include/uapi/linux/usb/audio.h b/include/uapi/linux/usb/audio.h
index 76b7c3f6cd0d..c917c53070d5 100644
--- a/include/uapi/linux/usb/audio.h
+++ b/include/uapi/linux/usb/audio.h
@@ -341,7 +341,7 @@ struct uac_feature_unit_descriptor {
__u8 bUnitID;
__u8 bSourceID;
__u8 bControlSize;
- __u8 bmaControls[0]; /* variable length */
+ __u8 bmaControls[]; /* variable length */
} __attribute__((packed));
static inline __u8 uac_feature_unit_iFeature(struct uac_feature_unit_descriptor *desc)
diff --git a/include/uapi/linux/usb/cdc.h b/include/uapi/linux/usb/cdc.h
index 6d61550959ef..acf3852bb676 100644
--- a/include/uapi/linux/usb/cdc.h
+++ b/include/uapi/linux/usb/cdc.h
@@ -171,7 +171,7 @@ struct usb_cdc_mdlm_detail_desc {
/* type is associated with mdlm_desc.bGUID */
__u8 bGuidDescriptorType;
- __u8 bDetailData[0];
+ __u8 bDetailData[];
} __attribute__ ((packed));
/* "OBEX Control Model Functional Descriptor" */
@@ -379,7 +379,7 @@ struct usb_cdc_ncm_ndp16 {
__le32 dwSignature;
__le16 wLength;
__le16 wNextNdpIndex;
- struct usb_cdc_ncm_dpe16 dpe16[0];
+ struct usb_cdc_ncm_dpe16 dpe16[];
} __attribute__ ((packed));
/* 32-bit NCM Datagram Pointer Entry */
@@ -395,7 +395,7 @@ struct usb_cdc_ncm_ndp32 {
__le16 wReserved6;
__le32 dwNextNdpIndex;
__le32 dwReserved12;
- struct usb_cdc_ncm_dpe32 dpe32[0];
+ struct usb_cdc_ncm_dpe32 dpe32[];
} __attribute__ ((packed));
/* CDC NCM subclass 3.2.1 and 3.2.2 */
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index 17ce56198c9a..31fcfa084e63 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -818,7 +818,7 @@ struct usb_key_descriptor {
__u8 tTKID[3];
__u8 bReserved;
- __u8 bKeyData[0];
+ __u8 bKeyData[];
} __attribute__((packed));
/*-------------------------------------------------------------------------*/
diff --git a/include/uapi/linux/usb/raw_gadget.h b/include/uapi/linux/usb/raw_gadget.h
index 0be685272eb1..c7d2199134d7 100644
--- a/include/uapi/linux/usb/raw_gadget.h
+++ b/include/uapi/linux/usb/raw_gadget.h
@@ -60,7 +60,7 @@ enum usb_raw_event_type {
struct usb_raw_event {
__u32 type;
__u32 length;
- __u8 data[0];
+ __u8 data[];
};
#define USB_RAW_IO_FLAGS_ZERO 0x0001
@@ -90,7 +90,7 @@ struct usb_raw_ep_io {
__u16 ep;
__u16 flags;
__u32 length;
- __u8 data[0];
+ __u8 data[];
};
/* Maximum number of non-control endpoints in struct usb_raw_eps_info. */
diff --git a/include/uapi/linux/usbdevice_fs.h b/include/uapi/linux/usbdevice_fs.h
index cf525cddeb94..74a84e02422a 100644
--- a/include/uapi/linux/usbdevice_fs.h
+++ b/include/uapi/linux/usbdevice_fs.h
@@ -131,7 +131,7 @@ struct usbdevfs_urb {
unsigned int signr; /* signal to be sent on completion,
or 0 if none should be sent. */
void __user *usercontext;
- struct usbdevfs_iso_packet_desc iso_frame_desc[0];
+ struct usbdevfs_iso_packet_desc iso_frame_desc[];
};
/* ioctls for talking directly to drivers */
@@ -176,7 +176,7 @@ struct usbdevfs_disconnect_claim {
struct usbdevfs_streams {
unsigned int num_streams; /* Not used by USBDEVFS_FREE_STREAMS */
unsigned int num_eps;
- unsigned char eps[0];
+ unsigned char eps[];
};
/*
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index 634cee485abb..391331a10879 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -107,7 +107,7 @@ struct vhost_memory_region {
struct vhost_memory {
__u32 nregions;
__u32 padding;
- struct vhost_memory_region regions[0];
+ struct vhost_memory_region regions[];
};
/* VHOST_SCSI specific definitions */
@@ -135,7 +135,7 @@ struct vhost_scsi_target {
struct vhost_vdpa_config {
__u32 off;
__u32 len;
- __u8 buf[0];
+ __u8 buf[];
};
/* vhost vdpa IOVA range
diff --git a/include/uapi/linux/virtio_9p.h b/include/uapi/linux/virtio_9p.h
index 441047432258..374b68f8ac6e 100644
--- a/include/uapi/linux/virtio_9p.h
+++ b/include/uapi/linux/virtio_9p.h
@@ -38,7 +38,7 @@ struct virtio_9p_config {
/* length of the tag name */
__virtio16 tag_len;
/* non-NULL terminated tag name */
- __u8 tag[0];
+ __u8 tag[];
} __attribute__((packed));
#endif /* _LINUX_VIRTIO_9P_H */
diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h
index 65e13a099b1a..e8191e0c3b56 100644
--- a/include/uapi/linux/xfrm.h
+++ b/include/uapi/linux/xfrm.h
@@ -33,7 +33,7 @@ struct xfrm_sec_ctx {
__u8 ctx_alg;
__u16 ctx_len;
__u32 ctx_sid;
- char ctx_str[0];
+ char ctx_str[];
};
/* Security Context Domains of Interpretation */
@@ -96,27 +96,27 @@ struct xfrm_replay_state_esn {
__u32 oseq_hi;
__u32 seq_hi;
__u32 replay_window;
- __u32 bmp[0];
+ __u32 bmp[];
};
struct xfrm_algo {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
- char alg_key[0];
+ char alg_key[];
};
struct xfrm_algo_auth {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
unsigned int alg_trunc_len; /* in bits */
- char alg_key[0];
+ char alg_key[];
};
struct xfrm_algo_aead {
char alg_name[64];
unsigned int alg_key_len; /* in bits */
unsigned int alg_icv_len; /* in bits */
- char alg_key[0];
+ char alg_key[];
};
struct xfrm_stats {
diff --git a/include/uapi/rdma/hfi/hfi1_user.h b/include/uapi/rdma/hfi/hfi1_user.h
index d95ef9a2b032..1106a7c90b29 100644
--- a/include/uapi/rdma/hfi/hfi1_user.h
+++ b/include/uapi/rdma/hfi/hfi1_user.h
@@ -180,7 +180,7 @@ struct hfi1_sdma_comp_entry {
struct hfi1_status {
__aligned_u64 dev; /* device/hw status bits */
__aligned_u64 port; /* port state and status bits */
- char freezemsg[0];
+ char freezemsg[];
};
enum sdma_req_opcode {
diff --git a/include/uapi/rdma/ib_user_verbs.h b/include/uapi/rdma/ib_user_verbs.h
index 7dd903d932e5..43672cb1fd57 100644
--- a/include/uapi/rdma/ib_user_verbs.h
+++ b/include/uapi/rdma/ib_user_verbs.h
@@ -158,18 +158,18 @@ struct ib_uverbs_ex_cmd_hdr {
struct ib_uverbs_get_context {
__aligned_u64 response;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_get_context_resp {
__u32 async_fd;
__u32 num_comp_vectors;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_device {
__aligned_u64 response;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_device_resp {
@@ -278,7 +278,7 @@ struct ib_uverbs_query_port {
__aligned_u64 response;
__u8 port_num;
__u8 reserved[7];
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_port_resp {
@@ -308,12 +308,12 @@ struct ib_uverbs_query_port_resp {
struct ib_uverbs_alloc_pd {
__aligned_u64 response;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_alloc_pd_resp {
__u32 pd_handle;
- __u32 driver_data[0];
+ __u32 driver_data[];
};
struct ib_uverbs_dealloc_pd {
@@ -324,12 +324,12 @@ struct ib_uverbs_open_xrcd {
__aligned_u64 response;
__u32 fd;
__u32 oflags;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_open_xrcd_resp {
__u32 xrcd_handle;
- __u32 driver_data[0];
+ __u32 driver_data[];
};
struct ib_uverbs_close_xrcd {
@@ -343,14 +343,14 @@ struct ib_uverbs_reg_mr {
__aligned_u64 hca_va;
__u32 pd_handle;
__u32 access_flags;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_reg_mr_resp {
__u32 mr_handle;
__u32 lkey;
__u32 rkey;
- __u32 driver_data[0];
+ __u32 driver_data[];
};
struct ib_uverbs_rereg_mr {
@@ -362,13 +362,13 @@ struct ib_uverbs_rereg_mr {
__aligned_u64 hca_va;
__u32 pd_handle;
__u32 access_flags;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_rereg_mr_resp {
__u32 lkey;
__u32 rkey;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_dereg_mr {
@@ -380,13 +380,13 @@ struct ib_uverbs_alloc_mw {
__u32 pd_handle;
__u8 mw_type;
__u8 reserved[3];
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_alloc_mw_resp {
__u32 mw_handle;
__u32 rkey;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_dealloc_mw {
@@ -408,7 +408,7 @@ struct ib_uverbs_create_cq {
__u32 comp_vector;
__s32 comp_channel;
__u32 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
enum ib_uverbs_ex_create_cq_flags {
@@ -442,13 +442,13 @@ struct ib_uverbs_resize_cq {
__aligned_u64 response;
__u32 cq_handle;
__u32 cqe;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_resize_cq_resp {
__u32 cqe;
__u32 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_poll_cq {
@@ -492,7 +492,7 @@ struct ib_uverbs_wc {
struct ib_uverbs_poll_cq_resp {
__u32 count;
__u32 reserved;
- struct ib_uverbs_wc wc[0];
+ struct ib_uverbs_wc wc[];
};
struct ib_uverbs_req_notify_cq {
@@ -585,7 +585,7 @@ struct ib_uverbs_create_qp {
__u8 qp_type;
__u8 is_srq;
__u8 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
enum ib_uverbs_create_qp_mask {
@@ -624,7 +624,7 @@ struct ib_uverbs_open_qp {
__u32 qpn;
__u8 qp_type;
__u8 reserved[7];
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
/* also used for open response */
@@ -669,7 +669,7 @@ struct ib_uverbs_query_qp {
__aligned_u64 response;
__u32 qp_handle;
__u32 attr_mask;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_qp_resp {
@@ -703,7 +703,7 @@ struct ib_uverbs_query_qp_resp {
__u8 alt_timeout;
__u8 sq_sig_all;
__u8 reserved[5];
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_modify_qp {
@@ -824,7 +824,7 @@ struct ib_uverbs_post_send {
__u32 wr_count;
__u32 sge_count;
__u32 wqe_size;
- struct ib_uverbs_send_wr send_wr[0];
+ struct ib_uverbs_send_wr send_wr[];
};
struct ib_uverbs_post_send_resp {
@@ -843,7 +843,7 @@ struct ib_uverbs_post_recv {
__u32 wr_count;
__u32 sge_count;
__u32 wqe_size;
- struct ib_uverbs_recv_wr recv_wr[0];
+ struct ib_uverbs_recv_wr recv_wr[];
};
struct ib_uverbs_post_recv_resp {
@@ -856,7 +856,7 @@ struct ib_uverbs_post_srq_recv {
__u32 wr_count;
__u32 sge_count;
__u32 wqe_size;
- struct ib_uverbs_recv_wr recv[0];
+ struct ib_uverbs_recv_wr recv[];
};
struct ib_uverbs_post_srq_recv_resp {
@@ -869,12 +869,12 @@ struct ib_uverbs_create_ah {
__u32 pd_handle;
__u32 reserved;
struct ib_uverbs_ah_attr attr;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_create_ah_resp {
__u32 ah_handle;
- __u32 driver_data[0];
+ __u32 driver_data[];
};
struct ib_uverbs_destroy_ah {
@@ -886,7 +886,7 @@ struct ib_uverbs_attach_mcast {
__u32 qp_handle;
__u16 mlid;
__u16 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_detach_mcast {
@@ -894,7 +894,7 @@ struct ib_uverbs_detach_mcast {
__u32 qp_handle;
__u16 mlid;
__u16 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_flow_spec_hdr {
@@ -1135,7 +1135,7 @@ struct ib_uverbs_flow_attr {
* struct ib_flow_spec_xxx
* struct ib_flow_spec_yyy
*/
- struct ib_uverbs_flow_spec_hdr flow_specs[0];
+ struct ib_uverbs_flow_spec_hdr flow_specs[];
};
struct ib_uverbs_create_flow {
@@ -1161,7 +1161,7 @@ struct ib_uverbs_create_srq {
__u32 max_wr;
__u32 max_sge;
__u32 srq_limit;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_create_xsrq {
@@ -1175,7 +1175,7 @@ struct ib_uverbs_create_xsrq {
__u32 max_num_tags;
__u32 xrcd_handle;
__u32 cq_handle;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_create_srq_resp {
@@ -1183,7 +1183,7 @@ struct ib_uverbs_create_srq_resp {
__u32 max_wr;
__u32 max_sge;
__u32 srqn;
- __u32 driver_data[0];
+ __u32 driver_data[];
};
struct ib_uverbs_modify_srq {
@@ -1191,14 +1191,14 @@ struct ib_uverbs_modify_srq {
__u32 attr_mask;
__u32 max_wr;
__u32 srq_limit;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_srq {
__aligned_u64 response;
__u32 srq_handle;
__u32 reserved;
- __aligned_u64 driver_data[0];
+ __aligned_u64 driver_data[];
};
struct ib_uverbs_query_srq_resp {
@@ -1269,7 +1269,7 @@ struct ib_uverbs_ex_create_rwq_ind_table {
* wq_handle1
* wq_handle2
*/
- __u32 wq_handles[0];
+ __u32 wq_handles[];
};
struct ib_uverbs_ex_create_rwq_ind_table_resp {
diff --git a/include/uapi/rdma/rdma_user_cm.h b/include/uapi/rdma/rdma_user_cm.h
index ed5a514305c1..7cea03581f79 100644
--- a/include/uapi/rdma/rdma_user_cm.h
+++ b/include/uapi/rdma/rdma_user_cm.h
@@ -184,7 +184,7 @@ struct rdma_ucm_query_addr_resp {
struct rdma_ucm_query_path_resp {
__u32 num_paths;
__u32 reserved;
- struct ib_path_rec_data path_data[0];
+ struct ib_path_rec_data path_data[];
};
struct rdma_ucm_conn_param {
diff --git a/include/uapi/rdma/rdma_user_ioctl_cmds.h b/include/uapi/rdma/rdma_user_ioctl_cmds.h
index 38ab7accb7be..ab1aef17feb1 100644
--- a/include/uapi/rdma/rdma_user_ioctl_cmds.h
+++ b/include/uapi/rdma/rdma_user_ioctl_cmds.h
@@ -81,7 +81,7 @@ struct ib_uverbs_ioctl_hdr {
__aligned_u64 reserved1;
__u32 driver_id;
__u32 reserved2;
- struct ib_uverbs_attr attrs[0];
+ struct ib_uverbs_attr attrs[];
};
#endif
diff --git a/include/uapi/scsi/fc/fc_els.h b/include/uapi/scsi/fc/fc_els.h
index c9812c5c2fc4..16782c360de3 100644
--- a/include/uapi/scsi/fc/fc_els.h
+++ b/include/uapi/scsi/fc/fc_els.h
@@ -264,7 +264,7 @@ struct fc_tlv_desc {
* Size of descriptor excluding
* desc_tag and desc_len fields.
*/
- __u8 desc_value[0]; /* Descriptor Value */
+ __u8 desc_value[]; /* Descriptor Value */
};
/* Descriptor tag and len fields are considered the mandatory header
@@ -1027,7 +1027,7 @@ struct fc_fn_li_desc {
* threshold to caause the LI event
*/
__be32 pname_count; /* number of portname_list elements */
- __be64 pname_list[0]; /* list of N_Port_Names accessible
+ __be64 pname_list[]; /* list of N_Port_Names accessible
* through the attached port
*/
};
@@ -1069,7 +1069,7 @@ struct fc_fn_peer_congn_desc {
* congestion event
*/
__be32 pname_count; /* number of portname_list elements */
- __be64 pname_list[0]; /* list of N_Port_Names accessible
+ __be64 pname_list[]; /* list of N_Port_Names accessible
* through the attached port
*/
};
@@ -1104,7 +1104,7 @@ struct fc_els_fpin {
* Size of ELS excluding fpin_cmd,
* fpin_zero and desc_len fields.
*/
- struct fc_tlv_desc fpin_desc[0]; /* Descriptor list */
+ struct fc_tlv_desc fpin_desc[]; /* Descriptor list */
};
/* Diagnostic Function Descriptor - FPIN Registration */
@@ -1115,7 +1115,7 @@ struct fc_df_desc_fpin_reg {
* desc_tag and desc_len fields.
*/
__be32 count; /* Number of desc_tags elements */
- __be32 desc_tags[0]; /* Array of Descriptor Tags.
+ __be32 desc_tags[]; /* Array of Descriptor Tags.
* Each tag indicates a function
* supported by the N_Port (request)
* or by the N_Port and Fabric
@@ -1135,7 +1135,7 @@ struct fc_els_rdf {
* Size of ELS excluding fpin_cmd,
* fpin_zero and desc_len fields.
*/
- struct fc_tlv_desc desc[0]; /* Descriptor list */
+ struct fc_tlv_desc desc[]; /* Descriptor list */
};
/*
@@ -1148,7 +1148,7 @@ struct fc_els_rdf_resp {
* and desc_list_len fields.
*/
struct fc_els_lsri_desc lsri;
- struct fc_tlv_desc desc[0]; /* Supported Descriptor list */
+ struct fc_tlv_desc desc[]; /* Supported Descriptor list */
};
@@ -1231,7 +1231,7 @@ struct fc_els_edc {
* Size of ELS excluding edc_cmd,
* edc_zero and desc_len fields.
*/
- struct fc_tlv_desc desc[0];
+ struct fc_tlv_desc desc[];
/* Diagnostic Descriptor list */
};
@@ -1245,7 +1245,7 @@ struct fc_els_edc_resp {
* and desc_list_len fields.
*/
struct fc_els_lsri_desc lsri;
- struct fc_tlv_desc desc[0];
+ struct fc_tlv_desc desc[];
/* Supported Diagnostic Descriptor list */
};
diff --git a/include/uapi/scsi/scsi_bsg_fc.h b/include/uapi/scsi/scsi_bsg_fc.h
index 3ae65e93235c..7f5930801f72 100644
--- a/include/uapi/scsi/scsi_bsg_fc.h
+++ b/include/uapi/scsi/scsi_bsg_fc.h
@@ -209,7 +209,7 @@ struct fc_bsg_host_vendor {
__u64 vendor_id;
/* start of vendor command area */
- __u32 vendor_cmd[0];
+ __u32 vendor_cmd[];
};
/* Response:
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 2d3e5df39a59..3974a2a911cc 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -1106,7 +1106,7 @@ struct snd_ctl_elem_value {
struct snd_ctl_tlv {
unsigned int numid; /* control element numeric identification */
unsigned int length; /* in bytes aligned to 4 */
- unsigned int tlv[0]; /* first TLV */
+ unsigned int tlv[]; /* first TLV */
};
#define SNDRV_CTL_IOCTL_PVERSION _IOR('U', 0x00, int)
diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h
index 39cf6eb75940..3532ac7046d7 100644
--- a/include/uapi/sound/firewire.h
+++ b/include/uapi/sound/firewire.h
@@ -38,11 +38,11 @@ struct snd_efw_transaction {
__be32 category;
__be32 command;
__be32 status;
- __be32 params[0];
+ __be32 params[];
};
struct snd_firewire_event_efw_response {
unsigned int type;
- __be32 response[0]; /* some responses */
+ __be32 response[]; /* some responses */
};
struct snd_firewire_event_digi00x_message {
@@ -63,7 +63,7 @@ struct snd_firewire_tascam_change {
struct snd_firewire_event_tascam_control {
unsigned int type;
- struct snd_firewire_tascam_change changes[0];
+ struct snd_firewire_tascam_change changes[];
};
struct snd_firewire_event_motu_register_dsp_change {
diff --git a/include/uapi/sound/skl-tplg-interface.h b/include/uapi/sound/skl-tplg-interface.h
index a93c0decfdd5..f29899b179a6 100644
--- a/include/uapi/sound/skl-tplg-interface.h
+++ b/include/uapi/sound/skl-tplg-interface.h
@@ -151,7 +151,7 @@ struct skl_dfw_algo_data {
__u32 rsvd:30;
__u32 param_id;
__u32 max;
- char params[0];
+ char params[];
} __packed;
enum skl_tkn_dir {
--git a/include/uapi/sound/sof/header.h b/include/uapi/sound/sof/header.h
index 5f4518e7a972..dbf137516522 100644
--- a/include/uapi/sound/sof/header.h
+++ b/include/uapi/sound/sof/header.h
@@ -23,7 +23,7 @@ struct sof_abi_hdr {
__u32 size; /**< size in bytes of data excl. this struct */
__u32 abi; /**< SOF ABI version */
__u32 reserved[4]; /**< reserved for future use */
- __u32 data[0]; /**< Component data - opaque to core */
+ __u32 data[]; /**< Component data - opaque to core */
} __packed;
#endif
diff --git a/include/uapi/sound/usb_stream.h b/include/uapi/sound/usb_stream.h
index 95419d8bbc16..ffdd3ea1e31d 100644
--- a/include/uapi/sound/usb_stream.h
+++ b/include/uapi/sound/usb_stream.h
@@ -61,7 +61,7 @@ struct usb_stream {
unsigned inpacket_split_at;
unsigned next_inpacket_split;
unsigned next_inpacket_split_at;
- struct usb_stream_packet inpacket[0];
+ struct usb_stream_packet inpacket[];
};
enum usb_stream_state {
diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h
index bf6e96011dfe..e135f4dcb19d 100644
--- a/tools/arch/x86/include/uapi/asm/kvm.h
+++ b/tools/arch/x86/include/uapi/asm/kvm.h
@@ -198,13 +198,13 @@ struct kvm_msrs {
__u32 nmsrs; /* number of msrs in entries */
__u32 pad;
- struct kvm_msr_entry entries[0];
+ struct kvm_msr_entry entries[];
};
/* for KVM_GET_MSR_INDEX_LIST */
struct kvm_msr_list {
__u32 nmsrs; /* number of msrs in entries */
- __u32 indices[0];
+ __u32 indices[];
};
/* Maximum size of any access bitmap in bytes */
@@ -241,7 +241,7 @@ struct kvm_cpuid_entry {
struct kvm_cpuid {
__u32 nent;
__u32 padding;
- struct kvm_cpuid_entry entries[0];
+ struct kvm_cpuid_entry entries[];
};
struct kvm_cpuid_entry2 {
@@ -263,7 +263,7 @@ struct kvm_cpuid_entry2 {
struct kvm_cpuid2 {
__u32 nent;
__u32 padding;
- struct kvm_cpuid_entry2 entries[0];
+ struct kvm_cpuid_entry2 entries[];
};
/* for KVM_GET_PIT and KVM_SET_PIT */
@@ -389,7 +389,7 @@ struct kvm_xsave {
* the contents of CPUID leaf 0xD on the host.
*/
__u32 region[1024];
- __u32 extra[0];
+ __u32 extra[];
};
#define KVM_MAX_XCRS 16
@@ -515,7 +515,7 @@ struct kvm_pmu_event_filter {
__u32 fixed_counter_bitmap;
__u32 flags;
__u32 pad[4];
- __u64 events[0];
+ __u64 events[];
};
#define KVM_PMU_EVENT_ALLOW 0
diff --git a/tools/include/uapi/drm/i915_drm.h b/tools/include/uapi/drm/i915_drm.h
index 05c3642aaece..239b91b13c60 100644
--- a/tools/include/uapi/drm/i915_drm.h
+++ b/tools/include/uapi/drm/i915_drm.h
@@ -2060,7 +2060,7 @@ struct i915_context_engines_load_balance {
__u64 mbz64; /* reserved for future use; must be zero */
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __attribute__((packed));
#define I915_DEFINE_CONTEXT_ENGINES_LOAD_BALANCE(name__, N__) struct { \
@@ -2098,7 +2098,7 @@ struct i915_context_engines_bond {
__u64 flags; /* all undefined flags must be zero */
__u64 mbz64[4]; /* reserved for future use; must be zero */
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __attribute__((packed));
#define I915_DEFINE_CONTEXT_ENGINES_BOND(name__, N__) struct { \
@@ -2225,7 +2225,7 @@ struct i915_context_engines_parallel_submit {
* length = width (i) * num_siblings (j)
* index = j + i * num_siblings
*/
- struct i915_engine_class_instance engines[0];
+ struct i915_engine_class_instance engines[];
} __packed;
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index f4009dbdf62d..e4b33ba06f00 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -79,7 +79,7 @@ struct bpf_insn {
/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
struct bpf_lpm_trie_key {
__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
- __u8 data[0]; /* Arbitrary size */
+ __u8 data[]; /* Arbitrary size */
};
struct bpf_cgroup_storage_key {
diff --git a/tools/include/uapi/linux/fs.h b/tools/include/uapi/linux/fs.h
index bdf7b404b3e7..b7b56871029c 100644
--- a/tools/include/uapi/linux/fs.h
+++ b/tools/include/uapi/linux/fs.h
@@ -90,7 +90,7 @@ struct file_dedupe_range {
__u16 dest_count; /* in - total elements in info array */
__u16 reserved1; /* must be zero */
__u32 reserved2; /* must be zero */
- struct file_dedupe_range_info info[0];
+ struct file_dedupe_range_info info[];
};
/* And dynamically-tunable limits and defaults: */
diff --git a/tools/include/uapi/linux/if_tun.h b/tools/include/uapi/linux/if_tun.h
index 454ae31b93c7..2ec07de1d73b 100644
--- a/tools/include/uapi/linux/if_tun.h
+++ b/tools/include/uapi/linux/if_tun.h
@@ -108,7 +108,7 @@ struct tun_pi {
struct tun_filter {
__u16 flags; /* TUN_FLT_ flags see above */
__u16 count; /* Number of addresses */
- __u8 addr[0][ETH_ALEN];
+ __u8 addr[][ETH_ALEN];
};
#endif /* _UAPI__IF_TUN_H */
diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
index 6a184d260c7f..37ce8cbac322 100644
--- a/tools/include/uapi/linux/kvm.h
+++ b/tools/include/uapi/linux/kvm.h
@@ -539,7 +539,7 @@ struct kvm_coalesced_mmio {
struct kvm_coalesced_mmio_ring {
__u32 first, last;
- struct kvm_coalesced_mmio coalesced_mmio[0];
+ struct kvm_coalesced_mmio coalesced_mmio[];
};
#define KVM_COALESCED_MMIO_MAX \
@@ -618,7 +618,7 @@ struct kvm_clear_dirty_log {
/* for KVM_SET_SIGNAL_MASK */
struct kvm_signal_mask {
__u32 len;
- __u8 sigset[0];
+ __u8 sigset[];
};
/* for KVM_TPR_ACCESS_REPORTING */
@@ -1216,7 +1216,7 @@ struct kvm_irq_routing_entry {
struct kvm_irq_routing {
__u32 nr;
__u32 flags;
- struct kvm_irq_routing_entry entries[0];
+ struct kvm_irq_routing_entry entries[];
};
#endif
@@ -1335,7 +1335,7 @@ struct kvm_dirty_tlb {
struct kvm_reg_list {
__u64 n; /* number of regs */
- __u64 reg[0];
+ __u64 reg[];
};
struct kvm_one_reg {
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index d37629dbad72..4653834f078f 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -491,7 +491,7 @@ struct perf_event_query_bpf {
/*
* User provided buffer to store program ids
*/
- __u32 ids[0];
+ __u32 ids[];
};
/*
diff --git a/tools/include/uapi/linux/pkt_cls.h b/tools/include/uapi/linux/pkt_cls.h
index 12153771396a..3faee0199a9b 100644
--- a/tools/include/uapi/linux/pkt_cls.h
+++ b/tools/include/uapi/linux/pkt_cls.h
@@ -180,7 +180,7 @@ struct tc_u32_sel {
short hoff;
__be32 hmask;
- struct tc_u32_key keys[0];
+ struct tc_u32_key keys[];
};
struct tc_u32_mark {
@@ -192,7 +192,7 @@ struct tc_u32_mark {
struct tc_u32_pcnt {
__u64 rcnt;
__u64 rhit;
- __u64 kcnts[0];
+ __u64 kcnts[];
};
/* Flags */
diff --git a/tools/include/uapi/linux/seg6.h b/tools/include/uapi/linux/seg6.h
index 286e8d6a8e98..f94baf154c47 100644
--- a/tools/include/uapi/linux/seg6.h
+++ b/tools/include/uapi/linux/seg6.h
@@ -30,7 +30,7 @@ struct ipv6_sr_hdr {
__u8 flags;
__u16 tag;
- struct in6_addr segments[0];
+ struct in6_addr segments[];
};
#define SR6_FLAG1_PROTECTED (1 << 6)
@@ -49,7 +49,7 @@ struct ipv6_sr_hdr {
struct sr6_tlv {
__u8 type;
__u8 len;
- __u8 data[0];
+ __u8 data[];
};
#endif
diff --git a/tools/include/uapi/linux/usbdevice_fs.h b/tools/include/uapi/linux/usbdevice_fs.h
index cf525cddeb94..74a84e02422a 100644
--- a/tools/include/uapi/linux/usbdevice_fs.h
+++ b/tools/include/uapi/linux/usbdevice_fs.h
@@ -131,7 +131,7 @@ struct usbdevfs_urb {
unsigned int signr; /* signal to be sent on completion,
or 0 if none should be sent. */
void __user *usercontext;
- struct usbdevfs_iso_packet_desc iso_frame_desc[0];
+ struct usbdevfs_iso_packet_desc iso_frame_desc[];
};
/* ioctls for talking directly to drivers */
@@ -176,7 +176,7 @@ struct usbdevfs_disconnect_claim {
struct usbdevfs_streams {
unsigned int num_streams; /* Not used by USBDEVFS_FREE_STREAMS */
unsigned int num_eps;
- unsigned char eps[0];
+ unsigned char eps[];
};
/*
diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h
index 2d3e5df39a59..3974a2a911cc 100644
--- a/tools/include/uapi/sound/asound.h
+++ b/tools/include/uapi/sound/asound.h
@@ -1106,7 +1106,7 @@ struct snd_ctl_elem_value {
struct snd_ctl_tlv {
unsigned int numid; /* control element numeric identification */
unsigned int length; /* in bytes aligned to 4 */
- unsigned int tlv[0]; /* first TLV */
+ unsigned int tlv[]; /* first TLV */
};
#define SNDRV_CTL_IOCTL_PVERSION _IOR('U', 0x00, int)
--
2.27.0
^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:04 [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
@ 2022-06-27 18:27 ` Daniel Borkmann
2022-06-27 18:35 ` Gustavo A. R. Silva
2022-06-28 0:40 ` Jason Gunthorpe
2022-06-27 19:53 ` Stephen Hemminger
` (2 subsequent siblings)
3 siblings, 2 replies; 15+ messages in thread
From: Daniel Borkmann @ 2022-06-27 18:27 UTC (permalink / raw)
To: Gustavo A. R. Silva, Kees Cook, linux-kernel
Cc: x86, dm-devel, linux-m68k, linux-mips, linux-s390, kvm,
intel-gfx, dri-devel, netdev, bpf, linux-btrfs, linux-can,
linux-fsdevel, linux1394-devel, io-uring, lvs-devel, linux-mtd,
kasan-dev, linux-mmc, nvdimm, netfilter-devel, coreteam,
linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
linux-hardening
On 6/27/22 8:04 PM, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
>
> This code was transformed with the help of Coccinelle:
> (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
>
> @@
> identifier S, member, array;
> type T1, T2;
> @@
>
> struct S {
> ...
> T1 member;
> T2 array[
> - 0
> ];
> };
>
> -fstrict-flex-arrays=3 is coming and we need to land these changes
> to prevent issues like these in the short future:
>
> ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> but the source string has length 2 (including NUL byte) [-Wfortify-source]
> strcpy(de3->name, ".");
> ^
>
> Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> this breaks anything, we can use a union with a new member name.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/78
> Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> Hi all!
>
> JFYI: I'm adding this to my -next tree. :)
Fyi, this breaks BPF CI:
https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
[...]
progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
struct bpf_lpm_trie_key trie_key;
^
1 error generated.
make: *** [Makefile:519: /tmp/runner/work/bpf/bpf/tools/testing/selftests/bpf/map_ptr_kern.o] Error 1
make: *** Waiting for unfinished jobs....
Error: Process completed with exit code 2.
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:27 ` Daniel Borkmann
@ 2022-06-27 18:35 ` Gustavo A. R. Silva
2022-06-28 0:40 ` Jason Gunthorpe
1 sibling, 0 replies; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-27 18:35 UTC (permalink / raw)
To: Daniel Borkmann
Cc: Kees Cook, linux-kernel, x86, dm-devel, linux-m68k, linux-mips,
linux-s390, kvm, intel-gfx, dri-devel, netdev, bpf, linux-btrfs,
linux-can, linux-fsdevel, linux1394-devel, io-uring, lvs-devel,
linux-mtd, kasan-dev, linux-mmc, nvdimm, netfilter-devel,
coreteam, linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
linux-hardening
On Mon, Jun 27, 2022 at 08:27:37PM +0200, Daniel Borkmann wrote:
> On 6/27/22 8:04 PM, Gustavo A. R. Silva wrote:
> > There is a regular need in the kernel to provide a way to declare
> > having a dynamically sized set of trailing elements in a structure.
> > Kernel code should always use “flexible array members”[1] for these
> > cases. The older style of one-element or zero-length arrays should
> > no longer be used[2].
> >
> > This code was transformed with the help of Coccinelle:
> > (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
> >
> > @@
> > identifier S, member, array;
> > type T1, T2;
> > @@
> >
> > struct S {
> > ...
> > T1 member;
> > T2 array[
> > - 0
> > ];
> > };
> >
> > -fstrict-flex-arrays=3 is coming and we need to land these changes
> > to prevent issues like these in the short future:
> >
> > ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> > but the source string has length 2 (including NUL byte) [-Wfortify-source]
> > strcpy(de3->name, ".");
> > ^
> >
> > Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> > this breaks anything, we can use a union with a new member name.
> >
> > [1] https://en.wikipedia.org/wiki/Flexible_array_member
> > [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> >
> > Link: https://github.com/KSPP/linux/issues/78
> > Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> > ---
> > Hi all!
> >
> > JFYI: I'm adding this to my -next tree. :)
>
> Fyi, this breaks BPF CI:
Thanks for the report! It seems the 0-day robot didn't catch that one.
I'll fix it up right away. :)
--
Gustavo
>
> https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
>
> [...]
> progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct bpf_lpm_trie_key trie_key;
> ^
> 1 error generated.
> make: *** [Makefile:519: /tmp/runner/work/bpf/bpf/tools/testing/selftests/bpf/map_ptr_kern.o] Error 1
> make: *** Waiting for unfinished jobs....
> Error: Process completed with exit code 2.
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:04 [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
2022-06-27 18:27 ` Daniel Borkmann
@ 2022-06-27 19:53 ` Stephen Hemminger
2022-06-28 14:18 ` Gustavo A. R. Silva
2022-06-27 22:31 ` Dan Williams
2022-06-28 7:27 ` Geert Uytterhoeven
3 siblings, 1 reply; 15+ messages in thread
From: Stephen Hemminger @ 2022-06-27 19:53 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Kees Cook, linux-kernel, x86, dm-devel, linux-m68k, linux-mips,
linux-s390, kvm, intel-gfx, dri-devel, netdev, bpf, linux-btrfs,
linux-can, linux-fsdevel, linux1394-devel, io-uring, lvs-devel,
linux-mtd, kasan-dev, linux-mmc, nvdimm, netfilter-devel,
coreteam, linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
linux-hardening
On Mon, 27 Jun 2022 20:04:32 +0200
"Gustavo A. R. Silva" <gustavoars@kernel.org> wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
>
> This code was transformed with the help of Coccinelle:
> (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
>
> @@
> identifier S, member, array;
> type T1, T2;
> @@
>
> struct S {
> ...
> T1 member;
> T2 array[
> - 0
> ];
> };
>
> -fstrict-flex-arrays=3 is coming and we need to land these changes
> to prevent issues like these in the short future:
>
> ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> but the source string has length 2 (including NUL byte) [-Wfortify-source]
> strcpy(de3->name, ".");
> ^
>
> Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> this breaks anything, we can use a union with a new member name.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/78
> Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks this fixes warning with gcc-12 in iproute2.
In function ‘xfrm_algo_parse’,
inlined from ‘xfrm_state_modify.constprop’ at xfrm_state.c:573:5:
xfrm_state.c:162:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
162 | buf[j] = val;
| ~~~~~~~^~~~~
^ permalink raw reply [flat|nested] 15+ messages in thread
* RE: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:04 [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
2022-06-27 18:27 ` Daniel Borkmann
2022-06-27 19:53 ` Stephen Hemminger
@ 2022-06-27 22:31 ` Dan Williams
2022-06-28 7:27 ` Geert Uytterhoeven
3 siblings, 0 replies; 15+ messages in thread
From: Dan Williams @ 2022-06-27 22:31 UTC (permalink / raw)
To: Gustavo A. R. Silva, Kees Cook, linux-kernel
Cc: x86, dm-devel, linux-m68k, linux-mips, linux-s390, kvm,
intel-gfx, dri-devel, netdev, bpf, linux-btrfs, linux-can,
linux-fsdevel, linux1394-devel, io-uring, lvs-devel, linux-mtd,
kasan-dev, linux-mmc, nvdimm, netfilter-devel, coreteam,
linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
Gustavo A. R. Silva, linux-hardening
Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
>
> This code was transformed with the help of Coccinelle:
> (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
>
> @@
> identifier S, member, array;
> type T1, T2;
> @@
>
> struct S {
> ...
> T1 member;
> T2 array[
> - 0
> ];
> };
>
> -fstrict-flex-arrays=3 is coming and we need to land these changes
> to prevent issues like these in the short future:
>
> ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> but the source string has length 2 (including NUL byte) [-Wfortify-source]
> strcpy(de3->name, ".");
> ^
>
> Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> this breaks anything, we can use a union with a new member name.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/78
> Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> Hi all!
>
> JFYI: I'm adding this to my -next tree. :)
>
[..]
> include/uapi/linux/ndctl.h | 10 +--
For ndctl.h
Acked-by: Dan Williams <dan.j.williams@intel.com>
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:27 ` Daniel Borkmann
2022-06-27 18:35 ` Gustavo A. R. Silva
@ 2022-06-28 0:40 ` Jason Gunthorpe
2022-06-28 0:58 ` Gustavo A. R. Silva
2022-06-28 17:54 ` Kees Cook
1 sibling, 2 replies; 15+ messages in thread
From: Jason Gunthorpe @ 2022-06-28 0:40 UTC (permalink / raw)
To: Daniel Borkmann
Cc: Gustavo A. R. Silva, Kees Cook, linux-kernel, x86, dm-devel,
linux-m68k, linux-mips, linux-s390, kvm, intel-gfx, dri-devel,
netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Mon, Jun 27, 2022 at 08:27:37PM +0200, Daniel Borkmann wrote:
> On 6/27/22 8:04 PM, Gustavo A. R. Silva wrote:
> > There is a regular need in the kernel to provide a way to declare
> > having a dynamically sized set of trailing elements in a structure.
> > Kernel code should always use “flexible array members”[1] for these
> > cases. The older style of one-element or zero-length arrays should
> > no longer be used[2].
> >
> > This code was transformed with the help of Coccinelle:
> > (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
> >
> > @@
> > identifier S, member, array;
> > type T1, T2;
> > @@
> >
> > struct S {
> > ...
> > T1 member;
> > T2 array[
> > - 0
> > ];
> > };
> >
> > -fstrict-flex-arrays=3 is coming and we need to land these changes
> > to prevent issues like these in the short future:
> >
> > ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> > but the source string has length 2 (including NUL byte) [-Wfortify-source]
> > strcpy(de3->name, ".");
> > ^
> >
> > Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> > this breaks anything, we can use a union with a new member name.
> >
> > [1] https://en.wikipedia.org/wiki/Flexible_array_member
> > [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> >
> > Link: https://github.com/KSPP/linux/issues/78
> > Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> > ---
> > Hi all!
> >
> > JFYI: I'm adding this to my -next tree. :)
>
> Fyi, this breaks BPF CI:
>
> https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
>
> [...]
> progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct bpf_lpm_trie_key trie_key;
> ^
This will break the rdma-core userspace as well, with a similar
error:
/usr/bin/clang-13 -DVERBS_DEBUG -Dibverbs_EXPORTS -Iinclude -I/usr/include/libnl3 -I/usr/include/drm -g -O2 -fdebug-prefix-map=/__w/1/s=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Werror -Wredundant-decls -g -fPIC -std=gnu11 -MD -MT libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -MF libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o.d -o libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -c ../libibverbs/cmd_flow.c
In file included from ../libibverbs/cmd_flow.c:33:
In file included from include/infiniband/cmd_write.h:36:
In file included from include/infiniband/cmd_ioctl.h:41:
In file included from include/infiniband/verbs.h:48:
In file included from include/infiniband/verbs_api.h:66:
In file included from include/infiniband/ib_user_ioctl_verbs.h:38:
include/rdma/ib_user_verbs.h:436:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_cq_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
struct ib_uverbs_create_cq_resp base;
^
include/rdma/ib_user_verbs.h:644:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_qp_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
struct ib_uverbs_create_qp_resp base;
Which is why I gave up trying to change these..
Though maybe we could just switch off -Wgnu-variable-sized-type-not-at-end during configuration ?
Jason
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 0:40 ` Jason Gunthorpe
@ 2022-06-28 0:58 ` Gustavo A. R. Silva
2022-06-28 2:21 ` Gustavo A. R. Silva
2022-06-28 17:54 ` Kees Cook
1 sibling, 1 reply; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 0:58 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Daniel Borkmann, Kees Cook, linux-kernel, x86, dm-devel,
linux-m68k, linux-mips, linux-s390, kvm, intel-gfx, dri-devel,
netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Mon, Jun 27, 2022 at 09:40:52PM -0300, Jason Gunthorpe wrote:
> On Mon, Jun 27, 2022 at 08:27:37PM +0200, Daniel Borkmann wrote:
> > On 6/27/22 8:04 PM, Gustavo A. R. Silva wrote:
> > > There is a regular need in the kernel to provide a way to declare
> > > having a dynamically sized set of trailing elements in a structure.
> > > Kernel code should always use “flexible array members”[1] for these
> > > cases. The older style of one-element or zero-length arrays should
> > > no longer be used[2].
> > >
> > > This code was transformed with the help of Coccinelle:
> > > (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
> > >
> > > @@
> > > identifier S, member, array;
> > > type T1, T2;
> > > @@
> > >
> > > struct S {
> > > ...
> > > T1 member;
> > > T2 array[
> > > - 0
> > > ];
> > > };
> > >
> > > -fstrict-flex-arrays=3 is coming and we need to land these changes
> > > to prevent issues like these in the short future:
> > >
> > > ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> > > but the source string has length 2 (including NUL byte) [-Wfortify-source]
> > > strcpy(de3->name, ".");
> > > ^
> > >
> > > Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> > > this breaks anything, we can use a union with a new member name.
> > >
> > > [1] https://en.wikipedia.org/wiki/Flexible_array_member
> > > [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> > >
> > > Link: https://github.com/KSPP/linux/issues/78
> > > Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> > > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> > > ---
> > > Hi all!
> > >
> > > JFYI: I'm adding this to my -next tree. :)
> >
> > Fyi, this breaks BPF CI:
> >
> > https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
> >
> > [...]
> > progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> > struct bpf_lpm_trie_key trie_key;
> > ^
>
> This will break the rdma-core userspace as well, with a similar
> error:
>
> /usr/bin/clang-13 -DVERBS_DEBUG -Dibverbs_EXPORTS -Iinclude -I/usr/include/libnl3 -I/usr/include/drm -g -O2 -fdebug-prefix-map=/__w/1/s=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Werror -Wredundant-decls -g -fPIC -std=gnu11 -MD -MT libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -MF libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o.d -o libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -c ../libibverbs/cmd_flow.c
> In file included from ../libibverbs/cmd_flow.c:33:
> In file included from include/infiniband/cmd_write.h:36:
> In file included from include/infiniband/cmd_ioctl.h:41:
> In file included from include/infiniband/verbs.h:48:
> In file included from include/infiniband/verbs_api.h:66:
> In file included from include/infiniband/ib_user_ioctl_verbs.h:38:
> include/rdma/ib_user_verbs.h:436:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_cq_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct ib_uverbs_create_cq_resp base;
> ^
> include/rdma/ib_user_verbs.h:644:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_qp_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct ib_uverbs_create_qp_resp base;
>
> Which is why I gave up trying to change these..
>
> Though maybe we could just switch off -Wgnu-variable-sized-type-not-at-end during configuration ?
No. I think now we can easily workaround these sorts of problems with
something like this:
struct flex {
any_type any_member;
union {
type array[0];
__DECLARE_FLEX_ARRAY(type, array_flex);
};
};
and use array_flex in kernel-space.
The same for the one-elment arrays in UAPI:
struct flex {
any_type any_member;
union {
type array[1];
__DECLARE_FLEX_ARRAY(type, array_flex);
};
};
I'll use the idiom above to resolve all these warnings in a follow-up
patch. :)
Thanks
--
Gustavo
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 0:58 ` Gustavo A. R. Silva
@ 2022-06-28 2:21 ` Gustavo A. R. Silva
2022-06-28 13:36 ` Jason Gunthorpe
0 siblings, 1 reply; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 2:21 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Daniel Borkmann, Kees Cook, linux-kernel, x86, dm-devel,
linux-m68k, linux-mips, linux-s390, kvm, intel-gfx, dri-devel,
netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Tue, Jun 28, 2022 at 02:58:25AM +0200, Gustavo A. R. Silva wrote:
> On Mon, Jun 27, 2022 at 09:40:52PM -0300, Jason Gunthorpe wrote:
> > On Mon, Jun 27, 2022 at 08:27:37PM +0200, Daniel Borkmann wrote:
> > > On 6/27/22 8:04 PM, Gustavo A. R. Silva wrote:
> > > > There is a regular need in the kernel to provide a way to declare
> > > > having a dynamically sized set of trailing elements in a structure.
> > > > Kernel code should always use “flexible array members”[1] for these
> > > > cases. The older style of one-element or zero-length arrays should
> > > > no longer be used[2].
> > > >
> > > > This code was transformed with the help of Coccinelle:
> > > > (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
> > > >
> > > > @@
> > > > identifier S, member, array;
> > > > type T1, T2;
> > > > @@
> > > >
> > > > struct S {
> > > > ...
> > > > T1 member;
> > > > T2 array[
> > > > - 0
> > > > ];
> > > > };
> > > >
> > > > -fstrict-flex-arrays=3 is coming and we need to land these changes
> > > > to prevent issues like these in the short future:
> > > >
> > > > ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
> > > > but the source string has length 2 (including NUL byte) [-Wfortify-source]
> > > > strcpy(de3->name, ".");
> > > > ^
> > > >
> > > > Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
> > > > this breaks anything, we can use a union with a new member name.
> > > >
> > > > [1] https://en.wikipedia.org/wiki/Flexible_array_member
> > > > [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> > > >
> > > > Link: https://github.com/KSPP/linux/issues/78
> > > > Build-tested-by: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
> > > > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> > > > ---
> > > > Hi all!
> > > >
> > > > JFYI: I'm adding this to my -next tree. :)
> > >
> > > Fyi, this breaks BPF CI:
> > >
> > > https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
> > >
> > > [...]
> > > progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> > > struct bpf_lpm_trie_key trie_key;
> > > ^
> >
> > This will break the rdma-core userspace as well, with a similar
> > error:
> >
> > /usr/bin/clang-13 -DVERBS_DEBUG -Dibverbs_EXPORTS -Iinclude -I/usr/include/libnl3 -I/usr/include/drm -g -O2 -fdebug-prefix-map=/__w/1/s=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Werror -Wredundant-decls -g -fPIC -std=gnu11 -MD -MT libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -MF libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o.d -o libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -c ../libibverbs/cmd_flow.c
> > In file included from ../libibverbs/cmd_flow.c:33:
> > In file included from include/infiniband/cmd_write.h:36:
> > In file included from include/infiniband/cmd_ioctl.h:41:
> > In file included from include/infiniband/verbs.h:48:
> > In file included from include/infiniband/verbs_api.h:66:
> > In file included from include/infiniband/ib_user_ioctl_verbs.h:38:
> > include/rdma/ib_user_verbs.h:436:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_cq_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> > struct ib_uverbs_create_cq_resp base;
> > ^
> > include/rdma/ib_user_verbs.h:644:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_qp_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> > struct ib_uverbs_create_qp_resp base;
> >
> > Which is why I gave up trying to change these..
> >
> > Though maybe we could just switch off -Wgnu-variable-sized-type-not-at-end during configuration ?
>
> No. I think now we can easily workaround these sorts of problems with
> something like this:
>
> struct flex {
> any_type any_member;
> union {
> type array[0];
> __DECLARE_FLEX_ARRAY(type, array_flex);
> };
> };
Mmmh... nope; this doesn't work[1].
We need to think in a different strategy.
--
Gustavo
[1] https://godbolt.org/z/av79Pqbfz
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 18:04 [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
` (2 preceding siblings ...)
2022-06-27 22:31 ` Dan Williams
@ 2022-06-28 7:27 ` Geert Uytterhoeven
2022-06-28 18:05 ` Kees Cook
3 siblings, 1 reply; 15+ messages in thread
From: Geert Uytterhoeven @ 2022-06-28 7:27 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Kees Cook, Linux Kernel Mailing List, the arch/x86 maintainers,
dm-devel, linux-m68k, open list:BROADCOM NVRAM DRIVER,
linux-s390, KVM list, Intel Graphics Development,
DRI Development, netdev, bpf, linux-btrfs, linux-can,
Linux FS Devel, linux1394-devel, io-uring, lvs-devel,
MTD Maling List, kasan-dev, Linux MMC List, nvdimm, NetFilter,
coreteam, linux-perf-users, linux-raid, linux-sctp, linux-stm32,
Linux ARM, scsi, target-devel, USB list, virtualization,
V9FS Developers, linux-rdma, ALSA Development Mailing List,
linux-hardening
Hi Gustavo,
Thanks for your patch!
On Mon, Jun 27, 2022 at 8:04 PM Gustavo A. R. Silva
<gustavoars@kernel.org> wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
These rules apply to the kernel, but uapi is not considered part of the
kernel, so different rules apply. Uapi header files should work with
whatever compiler that can be used for compiling userspace.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 2:21 ` Gustavo A. R. Silva
@ 2022-06-28 13:36 ` Jason Gunthorpe
2022-06-28 13:56 ` Gustavo A. R. Silva
0 siblings, 1 reply; 15+ messages in thread
From: Jason Gunthorpe @ 2022-06-28 13:36 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Daniel Borkmann, Kees Cook, linux-kernel, x86, dm-devel,
linux-m68k, linux-mips, linux-s390, kvm, intel-gfx, dri-devel,
netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Tue, Jun 28, 2022 at 04:21:29AM +0200, Gustavo A. R. Silva wrote:
> > > Though maybe we could just switch off -Wgnu-variable-sized-type-not-at-end during configuration ?
> We need to think in a different strategy.
I think we will need to switch off the warning in userspace - this is
doable for rdma-core.
On the other hand, if the goal is to enable the array size check
compiler warning I would suggest focusing only on those structs that
actually hit that warning in the kernel. IIRC infiniband doesn't
trigger it because it just pointer casts the flex array to some other
struct.
It isn't actually an array it is a placeholder for a trailing
structure, so it is never indexed.
This is also why we hit the warning because the convient way for
userspace to compose the message is to squash the header and trailer
structs together in a super struct on the stack, then invoke the
ioctl.
Jason
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 13:36 ` Jason Gunthorpe
@ 2022-06-28 13:56 ` Gustavo A. R. Silva
0 siblings, 0 replies; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 13:56 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Daniel Borkmann, Kees Cook, linux-kernel, x86, dm-devel,
linux-m68k, linux-mips, linux-s390, kvm, intel-gfx, dri-devel,
netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Tue, Jun 28, 2022 at 10:36:51AM -0300, Jason Gunthorpe wrote:
> On Tue, Jun 28, 2022 at 04:21:29AM +0200, Gustavo A. R. Silva wrote:
>
> > > > Though maybe we could just switch off -Wgnu-variable-sized-type-not-at-end during configuration ?
>
> > We need to think in a different strategy.
>
> I think we will need to switch off the warning in userspace - this is
> doable for rdma-core.
>
> On the other hand, if the goal is to enable the array size check
> compiler warning I would suggest focusing only on those structs that
> actually hit that warning in the kernel. IIRC infiniband doesn't
> trigger it because it just pointer casts the flex array to some other
> struct.
Yep; this is actually why I reverted those changes in rdma (before
sending out the patch) when 0-day reported the same problems you pointed
out[1].
Also, that's the strategy I'm following right now with the one-element
array into flex-array member transformations. I'm addressing those cases
in which the trailing array is actually being iterated over, first.
I just added the patch to my -next tree, so it can be build-tested by
other people, and let's see what else is reported this week. :)
--
Gustavo
[1] https://lore.kernel.org/lkml/620ca2a5.NkAEIDEfiYoxE9%2Fu%25lkp@intel.com/
>
> It isn't actually an array it is a placeholder for a trailing
> structure, so it is never indexed.
>
> This is also why we hit the warning because the convient way for
> userspace to compose the message is to squash the header and trailer
> structs together in a super struct on the stack, then invoke the
> ioctl.
>
> Jason
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-27 19:53 ` Stephen Hemminger
@ 2022-06-28 14:18 ` Gustavo A. R. Silva
0 siblings, 0 replies; 15+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-28 14:18 UTC (permalink / raw)
To: Stephen Hemminger
Cc: Kees Cook, linux-kernel, x86, dm-devel, linux-m68k, linux-mips,
linux-s390, kvm, intel-gfx, dri-devel, netdev, bpf, linux-btrfs,
linux-can, linux-fsdevel, linux1394-devel, io-uring, lvs-devel,
linux-mtd, kasan-dev, linux-mmc, nvdimm, netfilter-devel,
coreteam, linux-perf-users, linux-raid, linux-sctp, linux-stm32,
linux-arm-kernel, linux-scsi, target-devel, linux-usb,
virtualization, v9fs-developer, linux-rdma, alsa-devel,
linux-hardening
On Mon, Jun 27, 2022 at 12:53:43PM -0700, Stephen Hemminger wrote:
> Thanks this fixes warning with gcc-12 in iproute2.
> In function ‘xfrm_algo_parse’,
> inlined from ‘xfrm_state_modify.constprop’ at xfrm_state.c:573:5:
> xfrm_state.c:162:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
> 162 | buf[j] = val;
> | ~~~~~~~^~~~~
Great! This gives me hope. :)
Thanks
--
Gustavo
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 0:40 ` Jason Gunthorpe
2022-06-28 0:58 ` Gustavo A. R. Silva
@ 2022-06-28 17:54 ` Kees Cook
2022-06-28 18:44 ` Jason Gunthorpe
1 sibling, 1 reply; 15+ messages in thread
From: Kees Cook @ 2022-06-28 17:54 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Daniel Borkmann, Gustavo A. R. Silva, linux-kernel, x86,
dm-devel, linux-m68k, linux-mips, linux-s390, kvm, intel-gfx,
dri-devel, netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Mon, Jun 27, 2022 at 09:40:52PM -0300, Jason Gunthorpe wrote:
> On Mon, Jun 27, 2022 at 08:27:37PM +0200, Daniel Borkmann wrote:
> > [...]
> > Fyi, this breaks BPF CI:
> >
> > https://github.com/kernel-patches/bpf/runs/7078719372?check_suite_focus=true
> >
> > [...]
> > progs/map_ptr_kern.c:314:26: error: field 'trie_key' with variable sized type 'struct bpf_lpm_trie_key' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> > struct bpf_lpm_trie_key trie_key;
> > ^
The issue here seems to be a collision between "unknown array size"
and known sizes:
struct bpf_lpm_trie_key {
__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
__u8 data[0]; /* Arbitrary size */
};
struct lpm_key {
struct bpf_lpm_trie_key trie_key;
__u32 data;
};
This is treating trie_key as a header, which it's not: it's a complete
structure. :)
Perhaps:
struct lpm_key {
__u32 prefixlen;
__u32 data;
};
I don't see anything else trying to include bpf_lpm_trie_key.
>
> This will break the rdma-core userspace as well, with a similar
> error:
>
> /usr/bin/clang-13 -DVERBS_DEBUG -Dibverbs_EXPORTS -Iinclude -I/usr/include/libnl3 -I/usr/include/drm -g -O2 -fdebug-prefix-map=/__w/1/s=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wmissing-prototypes -Wmissing-declarations -Wwrite-strings -Wformat=2 -Wcast-function-type -Wformat-nonliteral -Wdate-time -Wnested-externs -Wshadow -Wstrict-prototypes -Wold-style-definition -Werror -Wredundant-decls -g -fPIC -std=gnu11 -MD -MT libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -MF libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o.d -o libibverbs/CMakeFiles/ibverbs.dir/cmd_flow.c.o -c ../libibverbs/cmd_flow.c
> In file included from ../libibverbs/cmd_flow.c:33:
> In file included from include/infiniband/cmd_write.h:36:
> In file included from include/infiniband/cmd_ioctl.h:41:
> In file included from include/infiniband/verbs.h:48:
> In file included from include/infiniband/verbs_api.h:66:
> In file included from include/infiniband/ib_user_ioctl_verbs.h:38:
> include/rdma/ib_user_verbs.h:436:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_cq_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct ib_uverbs_create_cq_resp base;
> ^
> include/rdma/ib_user_verbs.h:644:34: error: field 'base' with variable sized type 'struct ib_uverbs_create_qp_resp' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
> struct ib_uverbs_create_qp_resp base;
This looks very similar, a struct of unknown size is being treated as a
header struct:
struct ib_uverbs_create_cq_resp {
__u32 cq_handle;
__u32 cqe;
__aligned_u64 driver_data[0];
};
struct ib_uverbs_ex_create_cq_resp {
struct ib_uverbs_create_cq_resp base;
__u32 comp_mask;
__u32 response_length;
};
And it only gets used here:
DECLARE_UVERBS_WRITE(IB_USER_VERBS_CMD_CREATE_CQ,
ib_uverbs_create_cq,
UAPI_DEF_WRITE_UDATA_IO(
struct ib_uverbs_create_cq,
struct ib_uverbs_create_cq_resp),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UAPI_DEF_METHOD_NEEDS_FN(create_cq)),
which must also be assuming it's a header. So probably better to just
drop the driver_data field? I don't see anything using it (that I can
find) besides as a sanity-check that the field exists and is at the end
of the struct.
--
Kees Cook
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 7:27 ` Geert Uytterhoeven
@ 2022-06-28 18:05 ` Kees Cook
0 siblings, 0 replies; 15+ messages in thread
From: Kees Cook @ 2022-06-28 18:05 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Gustavo A. R. Silva, Linux Kernel Mailing List,
the arch/x86 maintainers, dm-devel, linux-m68k,
open list:BROADCOM NVRAM DRIVER, linux-s390, KVM list,
Intel Graphics Development, DRI Development, netdev, bpf,
linux-btrfs, linux-can, Linux FS Devel, linux1394-devel,
io-uring, lvs-devel, MTD Maling List, kasan-dev, Linux MMC List,
nvdimm, NetFilter, coreteam, linux-perf-users, linux-raid,
linux-sctp, linux-stm32, Linux ARM, scsi, target-devel, USB list,
virtualization, V9FS Developers, linux-rdma,
ALSA Development Mailing List, linux-hardening
On Tue, Jun 28, 2022 at 09:27:21AM +0200, Geert Uytterhoeven wrote:
> Hi Gustavo,
>
> Thanks for your patch!
>
> On Mon, Jun 27, 2022 at 8:04 PM Gustavo A. R. Silva
> <gustavoars@kernel.org> wrote:
> > There is a regular need in the kernel to provide a way to declare
> > having a dynamically sized set of trailing elements in a structure.
> > Kernel code should always use “flexible array members”[1] for these
> > cases. The older style of one-element or zero-length arrays should
> > no longer be used[2].
>
> These rules apply to the kernel, but uapi is not considered part of the
> kernel, so different rules apply. Uapi header files should work with
> whatever compiler that can be used for compiling userspace.
Right, userspace isn't bound by these rules, but the kernel ends up
consuming these structures, so we need to fix them. The [0] -> []
changes (when they are not erroneously being used within other
structures) is valid for all compilers. Flexible arrays are C99; it's
been 23 years. :)
But, yes, where we DO break stuff we need to workaround it, etc.
--
Kees Cook
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members
2022-06-28 17:54 ` Kees Cook
@ 2022-06-28 18:44 ` Jason Gunthorpe
0 siblings, 0 replies; 15+ messages in thread
From: Jason Gunthorpe @ 2022-06-28 18:44 UTC (permalink / raw)
To: Kees Cook
Cc: Daniel Borkmann, Gustavo A. R. Silva, linux-kernel, x86,
dm-devel, linux-m68k, linux-mips, linux-s390, kvm, intel-gfx,
dri-devel, netdev, bpf, linux-btrfs, linux-can, linux-fsdevel,
linux1394-devel, io-uring, lvs-devel, linux-mtd, kasan-dev,
linux-mmc, nvdimm, netfilter-devel, coreteam, linux-perf-users,
linux-raid, linux-sctp, linux-stm32, linux-arm-kernel,
linux-scsi, target-devel, linux-usb, virtualization,
v9fs-developer, linux-rdma, alsa-devel, linux-hardening
On Tue, Jun 28, 2022 at 10:54:58AM -0700, Kees Cook wrote:
> which must also be assuming it's a header. So probably better to just
> drop the driver_data field? I don't see anything using it (that I can
> find) besides as a sanity-check that the field exists and is at the end
> of the struct.
The field is guaranteeing alignment of the following structure. IIRC
there are a few cases that we don't have a u64 already to force this.
Jason
^ permalink raw reply [flat|nested] 15+ messages in thread
end of thread, other threads:[~2022-06-28 18:44 UTC | newest]
Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-06-27 18:04 [PATCH][next] treewide: uapi: Replace zero-length arrays with flexible-array members Gustavo A. R. Silva
2022-06-27 18:27 ` Daniel Borkmann
2022-06-27 18:35 ` Gustavo A. R. Silva
2022-06-28 0:40 ` Jason Gunthorpe
2022-06-28 0:58 ` Gustavo A. R. Silva
2022-06-28 2:21 ` Gustavo A. R. Silva
2022-06-28 13:36 ` Jason Gunthorpe
2022-06-28 13:56 ` Gustavo A. R. Silva
2022-06-28 17:54 ` Kees Cook
2022-06-28 18:44 ` Jason Gunthorpe
2022-06-27 19:53 ` Stephen Hemminger
2022-06-28 14:18 ` Gustavo A. R. Silva
2022-06-27 22:31 ` Dan Williams
2022-06-28 7:27 ` Geert Uytterhoeven
2022-06-28 18:05 ` Kees Cook
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