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authorMatt Fleming <matt@console-pimps.org>2009-08-20 20:42:34 +0200
committerMatt Fleming <matt@console-pimps.org>2009-08-21 14:04:10 +0200
commit5480675dc60c7dda7146e506981b2b40a775cc1e (patch)
tree71f0f32d67e7d13d484ff1f3cd9af85259d288ac /arch/sh/kernel/dwarf.c
parentsh: Setup the frame pointer in handle_interrupt (diff)
downloadlinux-5480675dc60c7dda7146e506981b2b40a775cc1e.tar.xz
linux-5480675dc60c7dda7146e506981b2b40a775cc1e.zip
sh: Fix bug calculating the end of the FDE instructions
The 'end' member of struct dwarf_fde denotes one byte past the end of the CFA instruction stream for an FDE. The value of 'end' was being calcualted incorrectly, it was being set too high. This resulted in dwarf_cfa_execute_insns() interpreting data past the end of valid instructions, thus causing all sorts of weird crashes. Signed-off-by: Matt Fleming <matt@console-pimps.org>
Diffstat (limited to 'arch/sh/kernel/dwarf.c')
-rw-r--r--arch/sh/kernel/dwarf.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c
index 606ece37eb42..e6f427cff5ba 100644
--- a/arch/sh/kernel/dwarf.c
+++ b/arch/sh/kernel/dwarf.c
@@ -751,7 +751,8 @@ static int dwarf_parse_cie(void *entry, void *p, unsigned long len,
}
static int dwarf_parse_fde(void *entry, u32 entry_type,
- void *start, unsigned long len)
+ void *start, unsigned long len,
+ unsigned char *end)
{
struct dwarf_fde *fde;
struct dwarf_cie *cie;
@@ -798,7 +799,7 @@ static int dwarf_parse_fde(void *entry, u32 entry_type,
/* Call frame instructions. */
fde->instructions = p;
- fde->end = start + len;
+ fde->end = end;
/* Add to list. */
spin_lock_irqsave(&dwarf_fde_lock, flags);
@@ -932,7 +933,7 @@ static int __init dwarf_unwinder_init(void)
else
c_entries++;
} else {
- err = dwarf_parse_fde(entry, entry_type, p, len);
+ err = dwarf_parse_fde(entry, entry_type, p, len, end);
if (err < 0)
goto out;
else