uprobes: Fix the racy uprobe->flags manipulation

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Multiple threads can manipulate uprobe->flags, this is obviously
unsafe. For example mmap can set UPROBE_COPY_INSN while register
tries to set UPROBE_RUN_HANDLER, the latter can also race with
can_skip_sstep() which clears UPROBE_SKIP_SSTEP.

Change this code to use bitops.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

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This commit is contained in:

Oleg Nesterov 2012-09-30 21:12:44 +02:00

parent 4710f05fd1

commit 71434f2fcb

1 changed files with 14 additions and 14 deletions

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28

kernel/events/uprobes.c

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