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Subject[PATCH 3.2 046/153] signal/openrisc: Fix do_unaligned_access to send the proper signal
3.2.102-rc1 review patch.  If anyone has any objections, please let me know.


From: "Eric W. Biederman" <>

commit 500d58300571b6602341b041f97c082a461ef994 upstream.

While reviewing the signal sending on openrisc the do_unaligned_access
function stood out because it is obviously wrong. A comment about an
si_code set above when actually si_code is never set. Leading to a
random si_code being sent to userspace in the event of an unaligned

Looking further SIGBUS BUS_ADRALN is the proper pair of signal and
si_code to send for an unaligned access. That is what other
architectures do and what is required by posix.

Given that do_unaligned_access is broken in a way that no one can be
relying on it on openrisc fix the code to just do the right thing.

Fixes: 769a8a96229e ("OpenRISC: Traps")
Cc: Jonas Bonn <>
Cc: Stefan Kristiansson <>
Cc: Stafford Horne <>
Cc: Arnd Bergmann <>
Acked-by: Stafford Horne <>
Signed-off-by: "Eric W. Biederman" <>
Signed-off-by: Ben Hutchings <>
arch/openrisc/kernel/traps.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -313,12 +313,12 @@ asmlinkage void do_unaligned_access(stru
siginfo_t info;

if (user_mode(regs)) {
- /* Send a SIGSEGV */
- info.si_signo = SIGSEGV;
+ /* Send a SIGBUS */
+ info.si_signo = SIGBUS;
info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *)address;
- force_sig_info(SIGSEGV, &info, current);
+ info.si_code = BUS_ADRALN;
+ info.si_addr = (void __user *)address;
+ force_sig_info(SIGBUS, &info, current);
} else {
printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
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