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| author |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-11 11:08:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-11 11:08:49 -0700 |
| commit | f358166a9405e4f1d8e50d8f415c26d95505b6de (patch) | |
| tree | 7f5349d9e8b59633b9f8a7bd9bcd45ace1d21a41 /block | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband (diff) | |
| download | linux-dev-f358166a9405e4f1d8e50d8f415c26d95505b6de.tar.xz linux-dev-f358166a9405e4f1d8e50d8f415c26d95505b6de.zip | |
ptrace_attach: fix possible deadlock schenario with irqs
Eric Biederman points out that we can't take the task_lock while holding
tasklist_lock for writing, because another CPU that holds the task lock
might take an interrupt that then tries to take tasklist_lock for writing.
Which would be a nasty deadlock, with one CPU spinning forever in an
interrupt handler (although admittedly you need to really work at
triggering it ;)
Since the ptrace_attach() code is special and very unusual, just make it
be extra careful, and use trylock+repeat to avoid the possible deadlock.
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions