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| author | Jan Beulich <jbeulich@novell.com> | 2006-12-07 02:14:13 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:13 +0100 |
| commit | 359ad0d4015a9ab39243f2ebc4eb07915bd618b2 (patch) | |
| tree | 90f05d8d9ab048029bfe1e451a012b4d5896aafe /arch/i386 | |
| parent | eef5e0d185fc049bda11fa14ba286fbd357da896 (diff) | |
| download | linux-359ad0d4015a9ab39243f2ebc4eb07915bd618b2.tar.bz2 | |
[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/i386')
| -rw-r--r-- | arch/i386/kernel/traps.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index 86d8476be4fe..c447807e2a45 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; } |