sched/psi: Fix OOB write when writing 0 bytes to PSI files

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commit 6fcca0fa48 upstream.

Issuing write() with count parameter set to 0 on any file under
/proc/pressure/ will cause an OOB write because of the access to
buf[buf_size-1] when NUL-termination is performed. Fix this by checking
for buf_size to be non-zero.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lkml.kernel.org/r/20200203212216.7076-1-surenb@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Suren Baghdasaryan 2020-02-03 13:22:16 -08:00 • committed by Greg Kroah-Hartman

parent 659b375f9b

commit 9ce51fc82b

1 changed files with 3 additions and 0 deletions

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kernel/sched/psi.c

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