linux

iv/linux

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Heiko Carstens d09c5373e8 s390/uaccess: get_user() should zero on failure (again)

Commit fd2d2b191fe7 ("s390: get_user() should zero on failure")
intended to fix s390's get_user() implementation which did not zero
the target operand if the read from user space faulted. Unfortunately
the patch has no effect: the corresponding inline assembly specifies
that the operand is only written to ("=") and the previous value is
discarded.

Therefore the compiler is free to and actually does omit the zero
initialization.

To fix this simply change the contraint modifier to "+", so the
compiler cannot omit the initialization anymore.

Fixes: c9ca78415ac1 ("s390/uaccess: provide inline variants of get_user/put_user")
Fixes: fd2d2b191fe7 ("s390: get_user() should zero on failure")
Cc: stable@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2017-03-30 08:18:59 +02:00

appldata

sched/headers: Move task statistics APIs from <linux/sched.h> to <linux/sched/stat.h>

2017-03-03 01:43:43 +01:00

boot

s390/decompressor: fix initrd corruption caused by bss clear

2017-03-22 08:21:20 +01:00

configs

perf/core: Rename CONFIG_[UK]PROBE_EVENT to CONFIG_[UK]PROBE_EVENTS

2017-03-01 10:26:39 +01:00

crypto

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux