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authorJan Beulich <jbeulich@novell.com>2006-12-07 02:14:13 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:13 +0100
commit359ad0d4015a9ab39243f2ebc4eb07915bd618b2 (patch)
tree90f05d8d9ab048029bfe1e451a012b4d5896aafe /arch/x86_64
parenteef5e0d185fc049bda11fa14ba286fbd357da896 (diff)
downloadlinux-linaro-stable-359ad0d4015a9ab39243f2ebc4eb07915bd618b2.tar.gz
[PATCH] unwinder: more sanity checks in Dwarf2 unwinder
Tighten the requirements on both input to and output from the Dwarf2 unwinder. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/traps.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 9864d195c408..4fdd162f0bef 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;
}