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| author | Robin Getz <robin.getz@analog.com> | 2009-05-11 20:34:41 +0200 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-06-12 12:11:45 +0200 |
| commit | a0cab65642813b7990e1b4b2ab6ad92e171571f4 (patch) | |
| tree | 9b1f9c50e36e69ef5776a404ac473313f4179794 /arch/blackfin | |
| parent | Blackfin: make deferred hardware errors more exact (diff) | |
| download | linux-a0cab65642813b7990e1b4b2ab6ad92e171571f4.tar.xz linux-a0cab65642813b7990e1b4b2ab6ad92e171571f4.zip | |
Blackfin: make sure stack is accessible before dumping it
When displaying a crash dump, make sure accessing the stack is safe so
we don't crash at the same time.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/kernel/traps.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c index fb5774275889..0d04a4732b1f 100644 --- a/arch/blackfin/kernel/traps.c +++ b/arch/blackfin/kernel/traps.c @@ -196,6 +196,11 @@ done: asmlinkage void double_fault_c(struct pt_regs *fp) { +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON + int j; + trace_buffer_save(j); +#endif + console_verbose(); oops_in_progress = 1; #ifdef CONFIG_DEBUG_VERBOSE @@ -220,6 +225,7 @@ asmlinkage void double_fault_c(struct pt_regs *fp) dump_bfin_process(fp); dump_bfin_mem(fp); show_regs(fp); + dump_bfin_trace_buffer(); } #endif panic("Double Fault - unrecoverable event"); @@ -832,6 +838,11 @@ void show_stack(struct task_struct *task, unsigned long *stack) decode_address(buf, (unsigned int)stack); printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf); + if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) { + printk(KERN_NOTICE "Invalid stack pointer\n"); + return; + } + /* First thing is to look for a frame pointer */ for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) { if (*addr & 0x1) |