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| author |   David S. Miller <davem@davemloft.net> | 2008-08-07 23:04:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-08-07 23:04:37 -0700 |
| commit | 433c5f706856689be25928a99636e724fb3ea7cf (patch) | |
| tree | 4a76f75ebec4adf1140a6f7930ce701b11d42d98 /arch/sparc64 | |
| parent | sparc: don't use asm/of_device.h (diff) | |
| download | linux-dev-433c5f706856689be25928a99636e724fb3ea7cf.tar.xz linux-dev-433c5f706856689be25928a99636e724fb3ea7cf.zip | |
sparc64: Fix end-of-stack checking in save_stack_trace().
Bug reported by Alexander Beregalov.
Before we dereference the stack frame or try to peek at the
pt_regs magic value, make sure the entire object is within
the kernel stack bounds.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
| -rw-r--r-- | arch/sparc64/kernel/stacktrace.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c index b3e3737750d8..e9d7f0660f2e 100644 --- a/arch/sparc64/kernel/stacktrace.c +++ b/arch/sparc64/kernel/stacktrace.c @@ -26,13 +26,15 @@ void save_stack_trace(struct stack_trace *trace) /* Bogus frame pointer? */ if (fp < (thread_base + sizeof(struct thread_info)) || - fp >= (thread_base + THREAD_SIZE)) + fp > (thread_base + THREAD_SIZE - sizeof(struct sparc_stackf))) break; sf = (struct sparc_stackf *) fp; regs = (struct pt_regs *) (sf + 1); - if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) { + if (((unsigned long)regs <= + (thread_base + THREAD_SIZE - sizeof(*regs))) && + (regs->magic & ~0x1ff) == PT_REGS_MAGIC) { if (!(regs->tstate & TSTATE_PRIV)) break; pc = regs->tpc; |