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authorRobin Getz <robin.getz@analog.com>2009-05-11 18:34:41 +0000
committerMike Frysinger <vapier@gentoo.org>2009-06-12 06:11:45 -0400
commita0cab65642813b7990e1b4b2ab6ad92e171571f4 (patch)
tree9b1f9c50e36e69ef5776a404ac473313f4179794 /arch/blackfin
parentb9a3899d59c3f0fc074573f0eba2419b1e4c0bca (diff)
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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.c11
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)