diff options
| author | Dave Martin <dave.martin@linaro.org> | 2011-07-28 15:29:40 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-08-09 09:42:39 +0200 |
| commit | 2102a65e69eac8d77dd71b4991b395e825087ba8 (patch) | |
| tree | 4e13dd2abc790283b6a987bdbf8e9c37a339edc7 /arch/arm/mm/alignment.c | |
| parent | ARM: 7007/1: alignment: Prevent ignoring of faults with ARMv6 unaligned acces... (diff) | |
| download | linux-2102a65e69eac8d77dd71b4991b395e825087ba8.tar.xz linux-2102a65e69eac8d77dd71b4991b395e825087ba8.zip | |
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 '')
| -rw-r--r-- | arch/arm/mm/alignment.c | 14 |
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 |