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authorDave Martin <dave.martin@linaro.org>2011-07-28 14:29:40 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-08-09 08:42:39 +0100
commit2102a65e69eac8d77dd71b4991b395e825087ba8 (patch)
tree4e13dd2abc790283b6a987bdbf8e9c37a339edc7 /arch
parent088c01f1e39dbe93a13e0b00f4532ed8b79d35f4 (diff)
ARM: 7008/1: alignment: Make SIGBUS sent to userspace POSIXly correct
With the UM_SIGNAL alignment fault mode, no siginfo structure is passed to userspace. POSIX specifies how siginfo_t should be populated for alignment faults, so this patch does just that: * si_signo = SIGBUS * si_code = BUS_ADRALN * si_addr = misaligned data address at which access was attempted Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/alignment.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 1df38e833570..cfbcf8b95599 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -22,6 +22,7 @@
#include <linux/sched.h>
#include <linux/uaccess.h>
+#include <asm/system.h>
#include <asm/unaligned.h>
#include "fault.h"
@@ -913,9 +914,16 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
if (ai_usermode & UM_FIXUP)
goto fixup;
- if (ai_usermode & UM_SIGNAL)
- force_sig(SIGBUS, current);
- else {
+ if (ai_usermode & UM_SIGNAL) {
+ siginfo_t si;
+
+ si.si_signo = SIGBUS;
+ si.si_errno = 0;
+ si.si_code = BUS_ADRALN;
+ si.si_addr = (void __user *)addr;
+
+ force_sig_info(si.si_signo, &si, current);
+ } else {
/*
* We're about to disable the alignment trap and return to
* user space. But if an interrupt occurs before actually