s390/compat: correct restore of high gprs on signal return

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commit 342300cc9c upstream.

git commit 8070361799
"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.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Schwidefsky 2016-02-19 14:44:14 +01:00 • committed by Greg Kroah-Hartman

parent a90ad5c546

commit d70325085f

1 changed files with 1 additions and 1 deletions

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arch/s390/kernel/compat_signal.c

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