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(parent: 4710f05) | patch
uprobes: Fix the racy uprobe->flags manipulation
authorOleg Nesterov <oleg@redhat.com>
Sun, 30 Sep 2012 19:12:44 +0000 (21:12 +0200)
committerOleg Nesterov <oleg@redhat.com>
Sun, 7 Oct 2012 19:19:43 +0000 (21:19 +0200)
commit71434f2fcba5c22d6e0d51878ba8e241a5dea5fb
tree0a61c5a75390a4eb39f018cc39cf8f40b0103058tree | snapshot
parent4710f05fd146d4739e57a8832a3abc5bd3bf0997commit | diff
uprobes: Fix the racy uprobe->flags manipulation

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>
kernel/events/uprobes.c diff | blob | history
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