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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Ard Biesheuvel <ardb@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 009/137] efi: cper: fix snprintf() use in cper_dimm_err_location()
Date: Tue,  8 Jun 2021 20:25:49 +0200	[thread overview]
Message-ID: <20210608175942.698829452@linuxfoundation.org> (raw)
In-Reply-To: <20210608175942.377073879@linuxfoundation.org>

From: Rasmus Villemoes <linux@rasmusvillemoes.dk>

[ Upstream commit 942859d969de7f6f7f2659a79237a758b42782da ]

snprintf() should be given the full buffer size, not one less. And it
guarantees nul-termination, so doing it manually afterwards is
pointless.

It's even potentially harmful (though probably not in practice because
CPER_REC_LEN is 256), due to the "return how much would have been
written had the buffer been big enough" semantics. I.e., if the bank
and/or device strings are long enough that the "DIMM location ..."
output gets truncated, writing to msg[n] is a buffer overflow.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Fixes: 3760cd20402d4 ("CPER: Adjust code flow of some functions")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/firmware/efi/cper.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index e15d484b6a5a..ea7ca74fc173 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -276,8 +276,7 @@ static int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg)
 	if (!msg || !(mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE))
 		return 0;
 
-	n = 0;
-	len = CPER_REC_LEN - 1;
+	len = CPER_REC_LEN;
 	dmi_memdev_name(mem->mem_dev_handle, &bank, &device);
 	if (bank && device)
 		n = snprintf(msg, len, "DIMM location: %s %s ", bank, device);
@@ -286,7 +285,6 @@ static int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg)
 			     "DIMM location: not present. DMI handle: 0x%.4x ",
 			     mem->mem_dev_handle);
 
-	msg[n] = '\0';
 	return n;
 }
 
-- 
2.30.2




  parent reply	other threads:[~2021-06-08 18:54 UTC|newest]

Thread overview: 145+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08 18:25 [PATCH 5.10 000/137] 5.10.43-rc1 review Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 001/137] btrfs: tree-checker: do not error out if extent ref hash doesnt match Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 002/137] net: usb: cdc_ncm: dont spew notifications Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 003/137] hwmon: (dell-smm-hwmon) Fix index values Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 004/137] hwmon: (pmbus/isl68137) remove READ_TEMPERATURE_3 for RAA228228 Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 005/137] netfilter: conntrack: unregister ipv4 sockopts on error unwind Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 006/137] efi/fdt: fix panic when no valid fdt found Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 007/137] efi: Allow EFI_MEMORY_XP and EFI_MEMORY_RO both to be cleared Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 008/137] efi/libstub: prevent read overflow in find_file_option() Greg Kroah-Hartman
2021-06-08 18:25 ` Greg Kroah-Hartman [this message]
2021-06-08 18:25 ` [PATCH 5.10 010/137] vfio/pci: Fix error return code in vfio_ecap_init() Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 011/137] vfio/pci: zap_vma_ptes() needs MMU Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 012/137] samples: vfio-mdev: fix error handing in mdpy_fb_probe() Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 013/137] vfio/platform: fix module_put call in error flow Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 014/137] ipvs: ignore IP_VS_SVC_F_HASHED flag when adding service Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 015/137] HID: logitech-hidpp: initialize level variable Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 016/137] HID: pidff: fix error return code in hid_pidff_init() Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 017/137] HID: i2c-hid: fix format string mismatch Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 018/137] devlink: Correct VIRTUAL port to not have phys_port attributes Greg Kroah-Hartman
2021-06-08 18:25 ` [PATCH 5.10 019/137] net/sched: act_ct: Offload connections with commit action Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 020/137] net/sched: act_ct: Fix ct template allocation for zone 0 Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 021/137] mptcp: always parse mptcp options for MPC reqsk Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 022/137] nvme-rdma: fix in-casule data send for chained sgls Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 023/137] ACPICA: Clean up context mutex during object deletion Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 024/137] perf probe: Fix NULL pointer dereference in convert_variable_location() Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 025/137] net: dsa: tag_8021q: fix the VLAN IDs used for encoding sub-VLANs Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 026/137] net: sock: fix in-kernel mark setting Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 027/137] net/tls: Replace TLS_RX_SYNC_RUNNING with RCU Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 028/137] net/tls: Fix use-after-free after the TLS device goes down and up Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 029/137] net/mlx5e: Fix incompatible casting Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 030/137] net/mlx5: Check firmware sync reset requested is set before trying to abort it Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 031/137] net/mlx5e: Check for needed capability for cvlan matching Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 032/137] net/mlx5: DR, Create multi-destination flow table with level less than 64 Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 033/137] nvmet: fix freeing unallocated p2pmem Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 034/137] netfilter: nft_ct: skip expectations for confirmed conntrack Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 035/137] netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 036/137] drm/i915/selftests: Fix return value check in live_breadcrumbs_smoketest() Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 037/137] bpf: Simplify cases in bpf_base_func_proto Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 038/137] bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 039/137] ieee802154: fix error return code in ieee802154_add_iface() Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 040/137] ieee802154: fix error return code in ieee802154_llsec_getparams() Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 041/137] igb: add correct exception tracing for XDP Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 042/137] ixgbevf: " Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 043/137] cxgb4: fix regression with HASH tc prio value update Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 044/137] ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 045/137] ice: Fix allowing VF to request more/less queues via virtchnl Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 046/137] ice: Fix VFR issues for AVF drivers that expect ATQLEN cleared Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 047/137] ice: handle the VF VSI rebuild failure Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 048/137] ice: report supported and advertised autoneg using PHY capabilities Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 049/137] ice: Allow all LLDP packets from PF to Tx Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 050/137] i2c: qcom-geni: Add shutdown callback for i2c Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 051/137] cxgb4: avoid link re-train during TC-MQPRIO configuration Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 052/137] i40e: optimize for XDP_REDIRECT in xsk path Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 053/137] i40e: add correct exception tracing for XDP Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 054/137] ice: simplify ice_run_xdp Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 055/137] ice: optimize for XDP_REDIRECT in xsk path Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 056/137] ice: add correct exception tracing for XDP Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 057/137] ixgbe: optimize for XDP_REDIRECT in xsk path Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 058/137] ixgbe: add correct exception tracing for XDP Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 059/137] arm64: dts: ti: j7200-main: Mark Main NAVSS as dma-coherent Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 060/137] optee: use export_uuid() to copy client UUID Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 061/137] bus: ti-sysc: Fix am335x resume hang for usb otg module Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 062/137] arm64: dts: ls1028a: fix memory node Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 063/137] arm64: dts: zii-ultra: fix 12V_MAIN voltage Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 064/137] arm64: dts: freescale: sl28: var4: fix RGMII clock and voltage Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 065/137] ARM: dts: imx7d-meerkat96: Fix the tuning-step property Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 066/137] ARM: dts: imx7d-pico: " Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 067/137] ARM: dts: imx: emcon-avari: Fix nxp,pca8574 #gpio-cells Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 068/137] bus: ti-sysc: Fix flakey idling of uarts and stop using swsup_sidle_act Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 069/137] tipc: add extack messages for bearer/media failure Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 070/137] tipc: fix unique bearer names sanity check Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 071/137] serial: stm32: fix threaded interrupt handling Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 072/137] riscv: vdso: fix and clean-up Makefile Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 073/137] io_uring: fix link timeout refs Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 074/137] io_uring: use better types for cflags Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 075/137] drm/amdgpu/vcn3: add cancel_delayed_work_sync before power gate Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 076/137] drm/amdgpu/jpeg2.5: " Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 077/137] drm/amdgpu/jpeg3: " Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 078/137] Bluetooth: fix the erroneous flush_work() order Greg Kroah-Hartman
2021-06-08 18:26 ` [PATCH 5.10 079/137] Bluetooth: use correct lock to prevent UAF of hdev object Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 080/137] wireguard: do not use -O3 Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 081/137] wireguard: peer: allocate in kmem_cache Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 082/137] wireguard: use synchronize_net rather than synchronize_rcu Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 083/137] wireguard: selftests: remove old conntrack kconfig value Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 084/137] wireguard: selftests: make sure rp_filter is disabled on vethc Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 085/137] wireguard: allowedips: initialize list head in selftest Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 086/137] wireguard: allowedips: remove nodes in O(1) Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 087/137] wireguard: allowedips: allocate nodes in kmem_cache Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 088/137] wireguard: allowedips: free empty intermediate nodes when removing single node Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 089/137] net: caif: added cfserl_release function Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 090/137] net: caif: add proper error handling Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 091/137] net: caif: fix memory leak in caif_device_notify Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 092/137] net: caif: fix memory leak in cfusbl_device_notify Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 093/137] HID: i2c-hid: Skip ELAN power-on command after reset Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 094/137] HID: magicmouse: fix NULL-deref on disconnect Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 095/137] HID: multitouch: require Finger field to mark Win8 reports as MT Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 096/137] gfs2: fix scheduling while atomic bug in glocks Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 097/137] ALSA: timer: Fix master timer notification Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 098/137] ALSA: hda: Fix for mute key LED for HP Pavilion 15-CK0xx Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 099/137] ALSA: hda: update the power_state during the direct-complete Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 100/137] ARM: dts: imx6dl-yapp4: Fix RGMII connection to QCA8334 switch Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 101/137] ARM: dts: imx6q-dhcom: Add PU,VDD1P1,VDD2P5 regulators Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 102/137] ext4: fix memory leak in ext4_fill_super Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 103/137] ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 104/137] ext4: fix fast commit alignment issues Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 105/137] ext4: fix memory leak in ext4_mb_init_backend on error path Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 106/137] ext4: fix accessing uninit percpu counter variable with fast_commit Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 107/137] usb: dwc2: Fix build in periphal-only mode Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 108/137] pid: take a reference when initializing `cad_pid` Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 109/137] ocfs2: fix data corruption by fallocate Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 110/137] mm/debug_vm_pgtable: fix alignment for pmd/pud_advanced_tests() Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 111/137] mm/page_alloc: fix counting of free pages after take off from buddy Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 112/137] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update_pasid() Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 113/137] x86/sev: Check SME/SEV support in CPUID first Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 114/137] nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 115/137] drm/amdgpu: Dont query CE and UE errors Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 116/137] drm/amdgpu: make sure we unpin the UVD BO Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 117/137] x86/apic: Mark _all_ legacy interrupts when IO/APIC is missing Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 118/137] powerpc/kprobes: Fix validation of prefixed instructions across page boundary Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 119/137] btrfs: mark ordered extent and inode with error if we fail to finish Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 120/137] btrfs: fix error handling in btrfs_del_csums Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 121/137] btrfs: return errors from btrfs_del_csums in cleanup_ref_head Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 122/137] btrfs: fixup error handling in fixup_inode_link_counts Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 123/137] btrfs: abort in rename_exchange if we fail to insert the second ref Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 124/137] btrfs: fix deadlock when cloning inline extents and low on available space Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 125/137] mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 126/137] drm/msm/dpu: always use mdp device to scale bandwidth Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 127/137] btrfs: fix unmountable seed device after fstrim Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 128/137] KVM: SVM: Truncate GPR value for DR and CR accesses in !64-bit mode Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 129/137] KVM: arm64: Fix debug register indexing Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 130/137] x86/kvm: Teardown PV features on boot CPU as well Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 131/137] x86/kvm: Disable kvmclock on all CPUs on shutdown Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 132/137] x86/kvm: Disable all PV features on crash Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 133/137] lib/lz4: explicitly support in-place decompression Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 134/137] i2c: qcom-geni: Suspend and resume the bus during SYSTEM_SLEEP_PM ops Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 135/137] netfilter: nf_tables: missing error reporting for not selected expressions Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 136/137] xen-netback: take a reference to the RX task thread Greg Kroah-Hartman
2021-06-08 18:27 ` [PATCH 5.10 137/137] neighbour: allow NUD_NOARP entries to be forced GCed Greg Kroah-Hartman
2021-06-09  2:54 ` [PATCH 5.10 000/137] 5.10.43-rc1 review Shuah Khan
2021-06-09  9:33 ` Jon Hunter
2021-06-09  9:34 ` Naresh Kamboju
2021-06-09 18:49 ` Florian Fainelli
2021-06-09 18:49 ` Guenter Roeck
2021-06-09 19:15 ` Pavel Machek
2021-06-10  9:02 ` Sudip Mukherjee

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