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linux/arch/s390/include
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Martin Schwidefsky bcf4dd5f9e s390: fix test_fp_ctl inline assembly contraints 
The test_fp_ctl function is used to test if a given value is a valid
floating-point control. The inline assembly in test_fp_ctl uses an
incorrect constraint for the 'orig_fpc' variable. If the compiler
chooses the same register for 'fpc' and 'orig_fpc' the test_fp_ctl()
function always returns true. This allows user space to trigger
kernel oopses with invalid floating-point control values on the
signal stack.

This problem has been introduced with git commit 4725c86055
"s390: fix save and restore of the floating-point-control register"

Cc: stable@vger.kernel.org # v3.13+
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
History 2016-06-28 09:24:28 +02:00
..
asm s390: fix test_fp_ctl inline assembly contraints 2016-06-28 09:24:28 +02:00
uapi/asm Small release overall. 2016-05-19 11:27:09 -07:00