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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-02-19 16:44:14 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-02-22 11:29:35 +0300 |
| commit | 342300cc9cd3428bc6bfe5809bfcc1b9a0f06702 (patch) | |
| tree | aa9ef26490a56a9b6fa973a30f2218a7783bfe8d /arch/s390 | |
| parent | 81f70ba233d5f660e1ea5fe23260ee323af5d53a (diff) | |
| download | linux-342300cc9cd3428bc6bfe5809bfcc1b9a0f06702.tar.xz | |
s390/compat: correct restore of high gprs on signal return
git commit 8070361799ae1e3f4ef347bd10f0a508ac10acfb
"s390: add support for vector extension"
broke 31-bit compat processes in regard to signal handling.
The restore_sigregs_ext32() function is used to restore the additional
elements from the user space signal frame. Among the additional elements
are the upper registers halves for 64-bit register support for 31-bit
processes. The copy_from_user that is used to retrieve the high-gprs
array from the user stack uses an incorrect length, 8 bytes instead of
64 bytes. This causes incorrect upper register halves to get loaded.
Cc: stable@vger.kernel.org # 3.8+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/compat_signal.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index 66c94417c0ba..4af60374eba0 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -271,7 +271,7 @@ static int restore_sigregs_ext32(struct pt_regs *regs, /* Restore high gprs from signal stack */ if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high, - sizeof(&sregs_ext->gprs_high))) + sizeof(sregs_ext->gprs_high))) return -EFAULT; for (i = 0; i < NUM_GPRS; i++) *(__u32 *)®s->gprs[i] = gprs_high[i]; |