From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
syzbot+9b64b619f10f19d19a7c@syzkaller.appspotmail.com,
Masami Hiramatsu <mhiramat@kernel.org>,
Borislav Petkov <bp@suse.de>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH 4.9 45/45] x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes
Date: Thu, 10 Dec 2020 15:26:59 +0100 [thread overview]
Message-ID: <20201210142604.559310989@linuxfoundation.org> (raw)
In-Reply-To: <20201210142602.361598591@linuxfoundation.org>
From: Masami Hiramatsu <mhiramat@kernel.org>
commit 4e9a5ae8df5b3365183150f6df49e49dece80d8c upstream
Since insn.prefixes.nbytes can be bigger than the size of
insn.prefixes.bytes[] when a prefix is repeated, the proper check must
be
insn.prefixes.bytes[i] != 0 and i < 4
instead of using insn.prefixes.nbytes.
Introduce a for_each_insn_prefix() macro for this purpose. Debugged by
Kees Cook <keescook@chromium.org>.
[ bp: Massage commit message, sync with the respective header in tools/
and drop "we". ]
Fixes: 2b1444983508 ("uprobes, mm, x86: Add the ability to install and remove uprobes breakpoints")
Reported-by: syzbot+9b64b619f10f19d19a7c@syzkaller.appspotmail.com
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/160697103739.3146288.7437620795200799020.stgit@devnote2
[sudip: adjust context, use old insn.h]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/include/asm/insn.h | 15 +++++++++++++++
arch/x86/kernel/uprobes.c | 10 ++++++----
tools/objtool/arch/x86/include/asm/insn.h | 15 +++++++++++++++
3 files changed, 36 insertions(+), 4 deletions(-)
--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -208,6 +208,21 @@ static inline int insn_offset_immediate(
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
+/**
+ * for_each_insn_prefix() -- Iterate prefixes in the instruction
+ * @insn: Pointer to struct insn.
+ * @idx: Index storage.
+ * @prefix: Prefix byte.
+ *
+ * Iterate prefix bytes of given @insn. Each prefix byte is stored in @prefix
+ * and the index is stored in @idx (note that this @idx is just for a cursor,
+ * do not change it.)
+ * Since prefixes.nbytes can be bigger than 4 if some prefixes
+ * are repeated, it cannot be used for looping over the prefixes.
+ */
+#define for_each_insn_prefix(insn, idx, prefix) \
+ for (idx = 0; idx < ARRAY_SIZE(insn->prefixes.bytes) && (prefix = insn->prefixes.bytes[idx]) != 0; idx++)
+
#define POP_SS_OPCODE 0x1f
#define MOV_SREG_OPCODE 0x8e
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -268,10 +268,11 @@ static volatile u32 good_2byte_insns[256
static bool is_prefix_bad(struct insn *insn)
{
+ insn_byte_t p;
int i;
- for (i = 0; i < insn->prefixes.nbytes; i++) {
- switch (insn->prefixes.bytes[i]) {
+ for_each_insn_prefix(insn, i, p) {
+ switch (p) {
case 0x26: /* INAT_PFX_ES */
case 0x2E: /* INAT_PFX_CS */
case 0x36: /* INAT_PFX_DS */
@@ -711,6 +712,7 @@ static const struct uprobe_xol_ops branc
static int branch_setup_xol_ops(struct arch_uprobe *auprobe, struct insn *insn)
{
u8 opc1 = OPCODE1(insn);
+ insn_byte_t p;
int i;
switch (opc1) {
@@ -741,8 +743,8 @@ static int branch_setup_xol_ops(struct a
* Intel and AMD behavior differ in 64-bit mode: Intel ignores 66 prefix.
* No one uses these insns, reject any branch insns with such prefix.
*/
- for (i = 0; i < insn->prefixes.nbytes; i++) {
- if (insn->prefixes.bytes[i] == 0x66)
+ for_each_insn_prefix(insn, i, p) {
+ if (p == 0x66)
return -ENOTSUPP;
}
--- a/tools/objtool/arch/x86/include/asm/insn.h
+++ b/tools/objtool/arch/x86/include/asm/insn.h
@@ -208,4 +208,19 @@ static inline int insn_offset_immediate(
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
+/**
+ * for_each_insn_prefix() -- Iterate prefixes in the instruction
+ * @insn: Pointer to struct insn.
+ * @idx: Index storage.
+ * @prefix: Prefix byte.
+ *
+ * Iterate prefix bytes of given @insn. Each prefix byte is stored in @prefix
+ * and the index is stored in @idx (note that this @idx is just for a cursor,
+ * do not change it.)
+ * Since prefixes.nbytes can be bigger than 4 if some prefixes
+ * are repeated, it cannot be used for looping over the prefixes.
+ */
+#define for_each_insn_prefix(insn, idx, prefix) \
+ for (idx = 0; idx < ARRAY_SIZE(insn->prefixes.bytes) && (prefix = insn->prefixes.bytes[idx]) != 0; idx++)
+
#endif /* _ASM_X86_INSN_H */
next prev parent reply other threads:[~2020-12-10 19:09 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 14:26 [PATCH 4.9 00/45] 4.9.248-rc1 review Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 01/45] net/af_iucv: set correct sk_protocol for child sockets Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 02/45] rose: Fix Null pointer dereference in rose_send_frame() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 03/45] usbnet: ipheth: fix connectivity with iOS 14 Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 04/45] bonding: wait for sysfs kobject destruction before freeing struct slave Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 05/45] netfilter: bridge: reset skb->pkt_type after NF_INET_POST_ROUTING traversal Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 06/45] ibmvnic: Ensure that SCRQ entry reads are correctly ordered Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 07/45] ibmvnic: Fix TX completion error handling Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 08/45] net/x25: prevent a couple of overflows Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 09/45] cxgb3: fix error return code in t3_sge_alloc_qset() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 10/45] net: pasemi: fix error return code in pasemi_mac_open() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 11/45] net/mlx5: Fix wrong address reclaim when command interface is down Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 12/45] dt-bindings: net: correct interrupt flags in examples Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 13/45] Input: xpad - support Ardwiino Controllers Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 14/45] Input: i8042 - add ByteSpeed touchpad to noloop table Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 15/45] spi: Fix controller unregister order harder Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 16/45] RDMA/i40iw: Address an mmap handler exploit in i40iw Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 17/45] btrfs: sysfs: init devices outside of the chunk_mutex Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 18/45] pinctrl: baytrail: Replace WARN with dev_info_once when setting direct-irq pin to output Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 19/45] pinctrl: baytrail: Fix pin being driven low for a while on gpiod_get(..., GPIOD_OUT_HIGH) Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 20/45] vlan: consolidate VLAN parsing code and limit max parsing depth Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 21/45] geneve: pull IP header before ECN decapsulation Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 22/45] usb: gadget: f_fs: Use local copy of descriptors for userspace copy Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 23/45] USB: serial: kl5kusb105: fix memleak on open Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 24/45] USB: serial: ch341: add new Product ID for CH341A Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 25/45] USB: serial: ch341: sort device-id entries Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 26/45] USB: serial: option: add Fibocom NL668 variants Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 27/45] USB: serial: option: add support for Thales Cinterion EXS82 Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 28/45] tty: Fix ->pgrp locking in tiocspgrp() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 29/45] ALSA: hda/realtek - Add new codec supported for ALC897 Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 30/45] ALSA: hda/generic: Add option to enforce preferred_dacs pairs Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 31/45] tty: Fix ->session locking Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 32/45] ftrace: Fix updating FTRACE_FL_TRAMP Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 33/45] cifs: fix potential use-after-free in cifs_echo_request() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 34/45] i2c: imx: Fix reset of I2SR_IAL flag Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 35/45] i2c: imx: Check for I2SR_IAL after every byte Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 36/45] iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 37/45] spi: Introduce device-managed SPI controller allocation Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 38/45] spi: bcm-qspi: Fix use-after-free on unbind Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 39/45] spi: bcm2835: " Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 40/45] spi: bcm2835: Release the DMA channel if probe fails after dma_init Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 41/45] tracing: Fix userstacktrace option for instances Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 42/45] gfs2: check for empty rgrp tree in gfs2_ri_update Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 43/45] i2c: qup: Fix error return code in qup_i2c_bam_schedule_desc() Greg Kroah-Hartman
2020-12-10 14:26 ` [PATCH 4.9 44/45] Input: i8042 - fix error return code in i8042_setup_aux() Greg Kroah-Hartman
2020-12-10 14:26 ` Greg Kroah-Hartman [this message]
2020-12-10 21:23 ` [PATCH 4.9 00/45] 4.9.248-rc1 review Shuah Khan
2020-12-10 23:43 ` Guenter Roeck
2020-12-11 12:03 ` Naresh Kamboju
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