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-rw-r--r--arch/i386/kernel/traps.c7
-rw-r--r--arch/x86_64/kernel/traps.c7
-rw-r--r--include/asm-i386/unwind.h12
-rw-r--r--include/asm-x86_64/unwind.h8
-rw-r--r--kernel/unwind.c16
5 files changed, 35 insertions, 15 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 86d8476be4f..c447807e2a4 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -161,12 +161,19 @@ dump_trace_unwind(struct unwind_frame_info *info, void *data)
{
struct ops_and_data *oad = (struct ops_and_data *)data;
int n = 0;
+ unsigned long sp = UNW_SP(info);
+ if (arch_unw_user_mode(info))
+ return -1;
while (unwind(info) == 0 && UNW_PC(info)) {
n++;
oad->ops->address(oad->data, UNW_PC(info));
if (arch_unw_user_mode(info))
break;
+ if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1))
+ && sp > UNW_SP(info))
+ break;
+ sp = UNW_SP(info);
}
return n;
}
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 9864d195c40..4fdd162f0be 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -225,12 +225,19 @@ static int dump_trace_unwind(struct unwind_frame_info *info, void *context)
{
struct ops_and_data *oad = (struct ops_and_data *)context;
int n = 0;
+ unsigned long sp = UNW_SP(info);
+ if (arch_unw_user_mode(info))
+ return -1;
while (unwind(info) == 0 && UNW_PC(info)) {
n++;
oad->ops->address(oad->data, UNW_PC(info));
if (arch_unw_user_mode(info))
break;
+ if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1))
+ && sp > UNW_SP(info))
+ break;
+ sp = UNW_SP(info);
}
return n;
}
diff --git a/include/asm-i386/unwind.h b/include/asm-i386/unwind.h
index 601fc67bd77..aa2c931e30d 100644
--- a/include/asm-i386/unwind.h
+++ b/include/asm-i386/unwind.h
@@ -79,17 +79,13 @@ extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *,
void *arg),
void *arg);
-static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
+static inline int arch_unw_user_mode(/*const*/ struct unwind_frame_info *info)
{
-#if 0 /* This can only work when selector register and EFLAGS saves/restores
- are properly annotated (and tracked in UNW_REGISTER_INFO). */
- return user_mode_vm(&info->regs);
-#else
- return info->regs.eip < PAGE_OFFSET
+ return user_mode_vm(&info->regs)
+ || info->regs.eip < PAGE_OFFSET
|| (info->regs.eip >= __fix_to_virt(FIX_VDSO)
- && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
+ && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
|| info->regs.esp < PAGE_OFFSET;
-#endif
}
#else
diff --git a/include/asm-x86_64/unwind.h b/include/asm-x86_64/unwind.h
index 2e7ff10fd77..2f6349e4871 100644
--- a/include/asm-x86_64/unwind.h
+++ b/include/asm-x86_64/unwind.h
@@ -87,14 +87,10 @@ extern int arch_unwind_init_running(struct unwind_frame_info *,
static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
{
-#if 0 /* This can only work when selector register saves/restores
- are properly annotated (and tracked in UNW_REGISTER_INFO). */
- return user_mode(&info->regs);
-#else
- return (long)info->regs.rip >= 0
+ return user_mode(&info->regs)
+ || (long)info->regs.rip >= 0
|| (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
|| (long)info->regs.rsp >= 0;
-#endif
}
#else
diff --git a/kernel/unwind.c b/kernel/unwind.c
index af48168a3af..7e721f10410 100644
--- a/kernel/unwind.c
+++ b/kernel/unwind.c
@@ -95,6 +95,7 @@ static const struct {
typedef unsigned long uleb128_t;
typedef signed long sleb128_t;
+#define sleb128abs __builtin_labs
static struct unwind_table {
struct {
@@ -787,7 +788,7 @@ int unwind(struct unwind_frame_info *frame)
#define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs])
const u32 *fde = NULL, *cie = NULL;
const u8 *ptr = NULL, *end = NULL;
- unsigned long pc = UNW_PC(frame) - frame->call_frame;
+ unsigned long pc = UNW_PC(frame) - frame->call_frame, sp;
unsigned long startLoc = 0, endLoc = 0, cfa;
unsigned i;
signed ptrType = -1;
@@ -936,6 +937,9 @@ int unwind(struct unwind_frame_info *frame)
state.dataAlign = get_sleb128(&ptr, end);
if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end)
cie = NULL;
+ else if (UNW_PC(frame) % state.codeAlign
+ || UNW_SP(frame) % sleb128abs(state.dataAlign))
+ return -EPERM;
else {
retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
/* skip augmentation */
@@ -968,6 +972,8 @@ int unwind(struct unwind_frame_info *frame)
#ifdef CONFIG_FRAME_POINTER
unsigned long top, bottom;
+ if ((UNW_SP(frame) | UNW_FP(frame)) % sizeof(unsigned long))
+ return -EPERM;
top = STACK_TOP(frame->task);
bottom = STACK_BOTTOM(frame->task);
# if FRAME_RETADDR_OFFSET < 0
@@ -1018,6 +1024,7 @@ int unwind(struct unwind_frame_info *frame)
|| state.regs[retAddrReg].where == Nowhere
|| state.cfa.reg >= ARRAY_SIZE(reg_info)
|| reg_info[state.cfa.reg].width != sizeof(unsigned long)
+ || FRAME_REG(state.cfa.reg, unsigned long) % sizeof(unsigned long)
|| state.cfa.offs % sizeof(unsigned long))
return -EIO;
/* update frame */
@@ -1038,6 +1045,8 @@ int unwind(struct unwind_frame_info *frame)
#else
# define CASES CASE(8); CASE(16); CASE(32); CASE(64)
#endif
+ pc = UNW_PC(frame);
+ sp = UNW_SP(frame);
for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
if (REG_INVALID(i)) {
if (state.regs[i].where == Nowhere)
@@ -1118,6 +1127,11 @@ int unwind(struct unwind_frame_info *frame)
}
}
+ if (UNW_PC(frame) % state.codeAlign
+ || UNW_SP(frame) % sleb128abs(state.dataAlign)
+ || (pc == UNW_PC(frame) && sp == UNW_SP(frame)))
+ return -EIO;
+
return 0;
#undef CASES
#undef FRAME_REG
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 17:38:39 +0000