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Baptiste Lepers c5102ced8a events: Reuse value read using READ_ONCE instead of re-reading it

commit b89a05b21f upstream.

In perf_event_addr_filters_apply, the task associated with
the event (event->ctx->task) is read using READ_ONCE at the beginning
of the function, checked, and then re-read from event->ctx->task,
voiding all guarantees of the checks. Reuse the value that was read by
READ_ONCE to ensure the consistency of the task struct throughout the
function.

Fixes: 375637bc52 ("perf/core: Introduce address range filtering")
Signed-off-by: Baptiste Lepers <baptiste.lepers@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210906015310.12802-1-baptiste.lepers@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2021-09-22 12:27:57 +02:00

callchain.c

uaccess: add force_uaccess_{begin,end} helpers

2020-08-12 10:57:59 -07:00

core.c

events: Reuse value read using READ_ONCE instead of re-reading it

2021-09-22 12:27:57 +02:00

hw_breakpoint.c

powerpc/watchpoint: Don't allow concurrent perf and ptrace events

2020-05-19 00:14:45 +10:00

internal.h

perf: Optimize get_recursion_context()