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author | Denys Vlasenko <vda.linux@googlemail.com> | 2012-03-23 15:02:42 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-23 16:58:40 -0700 |
commit | aa9147c98f27550bd39416eca5a5844e54bced26 (patch) | |
tree | d73386b9f58034ea3332c5359c04cfc13c085a7f /crypto | |
parent | 86b6c1f301faf085de5a3f9ce16b8de6e69c729b (diff) | |
download | op-kernel-dev-aa9147c98f27550bd39416eca5a5844e54bced26.zip op-kernel-dev-aa9147c98f27550bd39416eca5a5844e54bced26.tar.gz |
ptrace: make PTRACE_SEIZE set ptrace options specified in 'data' parameter
This can be used to close a few corner cases in strace where we get
unwanted racy behavior after attach, but before we have a chance to set
options (the notorious post-execve SIGTRAP comes to mind), and removes
the need to track "did we set opts for this task" state in strace
internals.
While we are at it:
Make it possible to extend SEIZE in the future with more functionality
by passing non-zero 'addr' parameter. To that end, error out if 'addr'
is non-zero. PTRACE_ATTACH did not (and still does not) have such
check, and users (strace) do pass garbage there... let's avoid
repeating this mistake with SEIZE.
Set all task->ptrace bits in one operation - before this change, we were
adding PT_SEIZED and PT_PTRACE_CAP with task->ptrace |= BIT ops. This
was probably ok (not a bug), but let's be on a safer side.
Changes since v2: use (unsigned long) casts instead of (long) ones, move
PTRACE_SEIZE_DEVEL-related code to separate lines of code.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Pedro Alves <palves@redhat.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions