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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2009-06-03 14:29:16 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2009-06-13 15:57:30 +0200
commitbb6e647051a59dca5a72b3deef1e061d7c1c34da (patch)
tree6b6ee5c3381e4e84560dc55f200190b1388e76d6 /arch/avr32/kernel
parentfbe0b8d5822a88e2e769a318eaf3134da5881769 (diff)
downloadlinux-bb6e647051a59dca5a72b3deef1e061d7c1c34da.tar.gz
linux-bb6e647051a59dca5a72b3deef1e061d7c1c34da.tar.xz
avr32: Fix oops on unaligned user access
The unaligned address exception handler (and others) does not scan the fixup tables before oopsing. This is bad because it means passing a badly aligned pointer from user space might crash the kernel. Fix this by scanning the fixup tables in _exception(). This should resolve the issue for unaligned addresses as well as other less common exceptions that might be happening during a userspace access. The page fault handler already does fixup processing. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/kernel')
-rw-r--r--arch/avr32/kernel/traps.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index d547c8df157d..6e3d491184ea 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -75,8 +75,17 @@ void _exception(long signr, struct pt_regs *regs, int code,
{
siginfo_t info;
- if (!user_mode(regs))
+ if (!user_mode(regs)) {
+ const struct exception_table_entry *fixup;
+
+ /* Are we prepared to handle this kernel fault? */
+ fixup = search_exception_tables(regs->pc);
+ if (fixup) {
+ regs->pc = fixup->fixup;
+ return;
+ }
die("Unhandled exception in kernel mode", regs, signr);
+ }
memset(&info, 0, sizeof(info));
info.si_signo = signr;