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authorMasami Hiramatsu <mhiramat@redhat.com>2009-03-16 18:57:22 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-17 09:11:48 -0700
commit30390880debce4a68fd23e87a787f27609e4bf4a (patch)
tree8466b965fee089fdafceaeaaf785fdea288b4bbd
parent18439c39e826191c0ef08c3a3271ce7ece46a860 (diff)
downloadop-kernel-dev-30390880debce4a68fd23e87a787f27609e4bf4a.zip
op-kernel-dev-30390880debce4a68fd23e87a787f27609e4bf4a.tar.gz
prevent boosting kprobes on exception address
Don't boost at the addresses which are listed on exception tables, because major page fault will occur on those addresses. In that case, kprobes can not ensure that when instruction buffer can be freed since some processes will sleep on the buffer. kprobes-ia64 already has same check. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86/kernel/kprobes.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index e948b28..4558dd3 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -193,6 +193,9 @@ static int __kprobes can_boost(kprobe_opcode_t *opcodes)
kprobe_opcode_t opcode;
kprobe_opcode_t *orig_opcodes = opcodes;
+ if (search_exception_tables(opcodes))
+ return 0; /* Page fault may occur on this address. */
+
retry:
if (opcodes - orig_opcodes > MAX_INSN_SIZE - 1)
return 0;
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