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29 July 2024, 15:18:00 UTC
Revision 19b558db12f9f4e45a22012bae7b4783e62224da authored by Thomas Gleixner on 15 February 2018, 16:21:55 UTC, committed by Thomas Gleixner on 22 March 2018, 11:29:27 UTC 
posix-timers: Protect posix clock array access against speculation
 
The clockid argument of clockid_to_kclock() comes straight from user space
via various syscalls and is used as index into the posix_clocks array.

Protect it against spectre v1 array out of bounds speculation. Remove the
redundant check for !posix_clock[id] as this is another source for
speculation and does not provide any advantage over the return
posix_clock[id] path which returns NULL in that case anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1802151718320.1296@nanos.tec.linutronix.de
1 parent 1b5f3ba
History
Tip revision: 19b558db12f9f4e45a22012bae7b4783e62224da authored by Thomas Gleixner on 15 February 2018, 16:21:55 UTC
posix-timers: Protect posix clock array access against speculation
Tip revision: 19b558d
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