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Message-ID: <lsq.1496331795.950394434@decadent.org.uk>
Date: Thu, 01 Jun 2017 16:43:15 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org,
"Leonid Yegoshin" <leonid.yegoshin@...tec.com>,
"Paul Burton" <paul.burton@...tec.com>, linux-mips@...ux-mips.org,
"Ralf Baechle" <ralf@...ux-mips.org>
Subject: [PATCH 3.16 007/212] MIPS: Prevent unaligned accesses during
stack unwinding
3.16.44-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Paul Burton <paul.burton@...tec.com>
commit a3552dace7d1d0cabf573e88fc3025cb90c4a601 upstream.
During stack unwinding we call a number of functions to determine what
type of instruction we're looking at. The union mips_instruction pointer
provided to them may be pointing at a 2 byte, but not 4 byte, aligned
address & we thus cannot directly access the 4 byte wide members of the
union mips_instruction. To avoid this is_ra_save_ins() copies the
required half-words of the microMIPS instruction to a correctly aligned
union mips_instruction on the stack, which it can then access safely.
The is_jump_ins() & is_sp_move_ins() functions do not correctly perform
this temporary copy, and instead attempt to directly dereference 4 byte
fields which may be misaligned and lead to an address exception.
Fix this by copying the instruction halfwords to a temporary union
mips_instruction in get_frame_info() such that we can provide a 4 byte
aligned union mips_instruction to the is_*_ins() functions and they do
not need to deal with misalignment themselves.
Signed-off-by: Paul Burton <paul.burton@...tec.com>
Fixes: 34c2f668d0f6 ("MIPS: microMIPS: Add unaligned access support.")
Cc: Leonid Yegoshin <leonid.yegoshin@...tec.com>
Cc: linux-mips@...ux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14529/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
[bwh: Backported to 3.16: old code had extra parentheses]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
arch/mips/kernel/process.c | 70 +++++++++++++++++++++++-----------------------
1 file changed, 35 insertions(+), 35 deletions(-)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -226,8 +226,6 @@ struct mips_frame_info {
static inline int is_ra_save_ins(union mips_instruction *ip)
{
#ifdef CONFIG_CPU_MICROMIPS
- union mips_instruction mmi;
-
/*
* swsp ra,offset
* swm16 reglist,offset(sp)
@@ -237,23 +235,20 @@ static inline int is_ra_save_ins(union m
*
* microMIPS is way more fun...
*/
- if (mm_insn_16bit(ip->halfword[0])) {
- mmi.word = (ip->halfword[0] << 16);
- return ((mmi.mm16_r5_format.opcode == mm_swsp16_op &&
- mmi.mm16_r5_format.rt == 31) ||
- (mmi.mm16_m_format.opcode == mm_pool16c_op &&
- mmi.mm16_m_format.func == mm_swm16_op));
+ if (mm_insn_16bit(ip->halfword[1])) {
+ return (ip->mm16_r5_format.opcode == mm_swsp16_op &&
+ ip->mm16_r5_format.rt == 31) ||
+ (ip->mm16_m_format.opcode == mm_pool16c_op &&
+ ip->mm16_m_format.func == mm_swm16_op);
}
else {
- mmi.halfword[0] = ip->halfword[1];
- mmi.halfword[1] = ip->halfword[0];
- return ((mmi.mm_m_format.opcode == mm_pool32b_op &&
- mmi.mm_m_format.rd > 9 &&
- mmi.mm_m_format.base == 29 &&
- mmi.mm_m_format.func == mm_swm32_func) ||
- (mmi.i_format.opcode == mm_sw32_op &&
- mmi.i_format.rs == 29 &&
- mmi.i_format.rt == 31));
+ return (ip->mm_m_format.opcode == mm_pool32b_op &&
+ ip->mm_m_format.rd > 9 &&
+ ip->mm_m_format.base == 29 &&
+ ip->mm_m_format.func == mm_swm32_func) ||
+ (ip->i_format.opcode == mm_sw32_op &&
+ ip->i_format.rs == 29 &&
+ ip->i_format.rt == 31);
}
#else
/* sw / sd $ra, offset($sp) */
@@ -274,12 +269,8 @@ static inline int is_jump_ins(union mips
*
* microMIPS is kind of more fun...
*/
- union mips_instruction mmi;
-
- mmi.word = (ip->halfword[0] << 16);
-
- if ((mmi.mm16_r5_format.opcode == mm_pool16c_op &&
- (mmi.mm16_r5_format.rt & mm_jr16_op) == mm_jr16_op) ||
+ if ((ip->mm16_r5_format.opcode == mm_pool16c_op &&
+ (ip->mm16_r5_format.rt & mm_jr16_op) == mm_jr16_op) ||
ip->j_format.opcode == mm_jal32_op)
return 1;
if (ip->r_format.opcode != mm_pool32a_op ||
@@ -308,15 +299,13 @@ static inline int is_sp_move_ins(union m
*
* microMIPS is not more fun...
*/
- if (mm_insn_16bit(ip->halfword[0])) {
- union mips_instruction mmi;
-
- mmi.word = (ip->halfword[0] << 16);
- return ((mmi.mm16_r3_format.opcode == mm_pool16d_op &&
- mmi.mm16_r3_format.simmediate && mm_addiusp_func) ||
- (mmi.mm16_r5_format.opcode == mm_pool16d_op &&
- mmi.mm16_r5_format.rt == 29));
+ if (mm_insn_16bit(ip->halfword[1])) {
+ return (ip->mm16_r3_format.opcode == mm_pool16d_op &&
+ ip->mm16_r3_format.simmediate && mm_addiusp_func) ||
+ (ip->mm16_r5_format.opcode == mm_pool16d_op &&
+ ip->mm16_r5_format.rt == 29);
}
+
return (ip->mm_i_format.opcode == mm_addiu32_op &&
ip->mm_i_format.rt == 29 && ip->mm_i_format.rs == 29);
#else
@@ -331,7 +320,8 @@ static inline int is_sp_move_ins(union m
static int get_frame_info(struct mips_frame_info *info)
{
- union mips_instruction *ip;
+ bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS);
+ union mips_instruction insn, *ip;
unsigned max_insns = info->func_size / sizeof(union mips_instruction);
unsigned i;
@@ -347,11 +337,21 @@ static int get_frame_info(struct mips_fr
max_insns = min(128U, max_insns);
for (i = 0; i < max_insns; i++, ip++) {
+ if (is_mmips && mm_insn_16bit(ip->halfword[0])) {
+ insn.halfword[0] = 0;
+ insn.halfword[1] = ip->halfword[0];
+ } else if (is_mmips) {
+ insn.halfword[0] = ip->halfword[1];
+ insn.halfword[1] = ip->halfword[0];
+ } else {
+ insn.word = ip->word;
+ }
- if (is_jump_ins(ip))
+ if (is_jump_ins(&insn))
break;
+
if (!info->frame_size) {
- if (is_sp_move_ins(ip))
+ if (is_sp_move_ins(&insn))
{
#ifdef CONFIG_CPU_MICROMIPS
if (mm_insn_16bit(ip->halfword[0]))
@@ -374,7 +374,7 @@ static int get_frame_info(struct mips_fr
}
continue;
}
- if (info->pc_offset == -1 && is_ra_save_ins(ip)) {
+ if (info->pc_offset == -1 && is_ra_save_ins(&insn)) {
info->pc_offset =
ip->i_format.simmediate / sizeof(long);
break;
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