s390/futex: Fix FUTEX_OP_ANDN implementation

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commit 26701574ce upstream.

The futex operation FUTEX_OP_ANDN is supposed to implement

*(int *)UADDR2 &= ~OPARG;

The s390 implementation just implements an AND instead of ANDN.
Add the missing bitwise not operation to oparg to fix this.

This is broken since nearly 19 years, so it looks like user space is
not making use of this operation.

Fixes: 3363fbdd6f ("[PATCH] s390: futex atomic operations")
Cc: stable@vger.kernel.org
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Heiko Carstens 2025-01-07 11:28:58 +01:00 • committed by Greg Kroah-Hartman

parent 7879a3e54c

commit 2eb70a0b5b

1 changed files with 1 additions and 1 deletions

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arch/s390/include/asm/futex.h

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