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futex: Validate futex value against futex size
authorpeterz@infradead.org <peterz@infradead.org>
Thu, 21 Sep 2023 10:45:09 +0000 (12:45 +0200)
committerPeter Zijlstra <peterz@infradead.org>
Thu, 21 Sep 2023 17:22:06 +0000 (19:22 +0200)
commit698eb826383616ce0e817d2384da6413d1439fb6
treebd22f2fa7f6a8a57253b9040778f5d12f5c43228tree
parent5694289ce183bc3336407a78c8c722a0b9208f9bcommit | diff
futex: Validate futex value against futex size

Ensure the futex value fits in the given futex size. Since this adds a
constraint to an existing syscall, it might possibly change behaviour.

Currently the value would be truncated to a u32 and any high bits
would get silently lost.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230921105247.828934099@noisy.programming.kicks-ass.net
kernel/futex/futex.h diff | blob | history
kernel/futex/syscalls.c diff | blob | history
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