diff options
| author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-11 11:08:49 -0700 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2006-05-20 15:00:33 -0700 |
| commit | f91962f90eb89684ecbfb3f6b8578b3ebd6937df (patch) | |
| tree | 2c4d2f06aab013d41f6d099a6cc3ea23973fa44a /include/linux/ppp_defs.h | |
| parent | 65b01b76265047aa59d6eb741ec61468c8867256 (diff) | |
[PATCH] 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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/ppp_defs.h')
0 files changed, 0 insertions, 0 deletions