sh: fix unaligned and nonexistent address handling
unaligned and nonexistent address causes wrong exception
handling in traps_32.c(handle_unaligned_access).
'handle_unalinged_ins' should return -EFAULT if address error
is fixed up with kernel exception table, otherwise
'handle_unaligned_access' increases already fixed program counter
and then crash.
for example
ioctl(fd, TCGETA, (struct termio *)-1)
never return and stay in TASK_UNINTERRUPTIBLE state forever
in my kernel.
Signed-off-by: SUGIOKA Toshinobu <sugioka@itonet.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index c0aa3d8..60dcf87 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -125,20 +125,18 @@
* - userspace errors just cause EFAULT to be returned, resulting in SEGV
* - kernel/userspace interfaces cause a jump to an appropriate handler
* - other kernel errors are bad
- * - return 0 if fixed-up, -EFAULT if non-fatal (to the kernel) fault
*/
-static int die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
+static void die_if_no_fixup(const char * str, struct pt_regs * regs, long err)
{
if (!user_mode(regs)) {
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->pc);
if (fixup) {
regs->pc = fixup->fixup;
- return 0;
+ return;
}
die(str, regs, err);
}
- return -EFAULT;
}
static inline void sign_extend(unsigned int count, unsigned char *dst)
@@ -314,7 +312,8 @@
/* Argh. Address not only misaligned but also non-existent.
* Raise an EFAULT and see if it's trapped
*/
- return die_if_no_fixup("Fault in unaligned fixup", regs, 0);
+ die_if_no_fixup("Fault in unaligned fixup", regs, 0);
+ return -EFAULT;
}
/*