Commit bcf4dd5f authored Jun 27, 2016 by Martin Schwidefsky

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 4725c860
"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>

parent 5419447e

arch/s390/include/asm/fpu/api.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -22,7 +22,7 @@ static inline int test_fp_ctl(u32 fpc)
		" la %0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc), "=d" (orig_fpc)
		: "=d" (rc), "=&d" (orig_fpc)
		: "d" (fpc), "0" (-EINVAL));
		return rc;
		}