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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>
This commit is contained in:
Dave Martin 2011-07-28 14:29:40 +01:00 committed by Russell King
parent 088c01f1e3
commit 2102a65e69
1 changed files with 11 additions and 3 deletions
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14
arch/arm/mm/alignment.c
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@ -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