Messages in this thread Patch in this message | | | Subject | [PATCH] Fix out-by-one error in traps.c | From | Rusty Russell <> | Date | Fri, 31 Aug 2007 08:14:26 +1000 |
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We don't care if ebp is on the stack, we care about ebp + 4. Without this, lguest (with CONFIG_DEBUG_LOCKDEP) can touch a page unmapped by CONFIG_DEBUG_PAGEALLOC.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff -r b0b1ab8ecf48 arch/i386/kernel/traps.c --- a/arch/i386/kernel/traps.c Fri Aug 31 03:25:06 2007 +1000 +++ b/arch/i386/kernel/traps.c Fri Aug 31 07:57:35 2007 +1000 @@ -100,7 +100,7 @@ print_context_stack(struct thread_info *tinfo, unsigned long addr; #ifdef CONFIG_FRAME_POINTER - while (valid_stack_ptr(tinfo, (void *)ebp)) { + while (valid_stack_ptr(tinfo, (void *)ebp + 4)) { unsigned long new_ebp; addr = *(unsigned long *)(ebp + 4); ops->address(data, addr);
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