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authorOleg Nesterov <oleg@redhat.com>2012-09-30 20:31:41 +0200
committerAnton Arapov <anton@redhat.com>2012-10-29 11:50:19 +0100
commit7e0dbbe849e1d99b1b3ae1b5acc7a1dabaf64e7f (patch)
tree7984c88cbbdc57b2b69b9f0a8bae7efc6309e110 /arch/arm/mach-vt8500/include/mach/entry-macro.S
parent50dfafcb45e17878104d94f7a479de83ec76d6b6 (diff)
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uprobes: Fix prepare_uprobe() race with itself
install_breakpoint() is called under mm->mmap_sem, this protects set_swbp() but not prepare_uprobe(). Two or more different tasks can call install_breakpoint()->prepare_uprobe() at the same time, this leads to numerous problems if UPROBE_COPY_INSN is not set. Just for example, the second copy_insn() can corrupt the already analyzed/fixuped uprobe->arch.insn and race with handle_swbp(). This patch simply adds uprobe->copy_mutex to serialize this code. We could probably reuse ->consumer_rwsem, but this would mean that consumer->handler() can not use mm->mmap_sem, not good. Note: this is another temporary ugly hack until we move this logic into uprobe_register(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Diffstat (limited to 'arch/arm/mach-vt8500/include/mach/entry-macro.S')
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