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| author |   Tejun Heo <tj@kernel.org> | 2011-06-17 16:50:35 +0200 |
|---|---|---|
| committer |   Oleg Nesterov <oleg@redhat.com> | 2011-06-22 19:26:28 +0200 |
| commit | 643ad8388e189dfd14ef76972cf7dc394b3cbebd (patch) | |
| tree | 82d4787ddc09cf5a6fc9fc1345839973ab7763f5 /include/linux/tracehook.h | |
| parent | ptrace: kill task_ptrace() (diff) | |
| download | wireguard-linux-643ad8388e189dfd14ef76972cf7dc394b3cbebd.tar.xz wireguard-linux-643ad8388e189dfd14ef76972cf7dc394b3cbebd.zip | |
ptrace: introduce ptrace_event_enabled() and simplify ptrace_event() and tracehook_prepare_clone()
This patch implements ptrace_event_enabled() which tests whether a
given PTRACE_EVENT_* is enabled and use it to simplify ptrace_event()
and tracehook_prepare_clone().
PT_EVENT_FLAG() macro is added which calculates PT_TRACE_* flag from
PTRACE_EVENT_*. This is used to define PT_TRACE_* flags and by
ptrace_event_enabled() to find the matching flag.
This is used to make ptrace_event() and tracehook_prepare_clone()
simpler.
* ptrace_event() callers were responsible for providing mask to test
whether the event was enabled. This patch implements
ptrace_event_enabled() and make ptrace_event() drop @mask and
determine whether the event is enabled from @event. Note that
@event is constant and this conversion doesn't add runtime overhead.
All conversions except tracehook_report_clone_complete() are
trivial. tracehook_report_clone_complete() used to use 0 for @mask
(always enabled) but now tests whether the specified event is
enabled. This doesn't cause any behavior difference as it's
guaranteed that the event specified by @trace is enabled.
* tracehook_prepare_clone() now only determines which event is
applicable and use ptrace_event_enabled() for enable test.
This doesn't introduce any behavior change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'include/linux/tracehook.h')
| -rw-r--r-- | include/linux/tracehook.h | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index a3e838784f43..7d38571b0c05 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -201,7 +201,7 @@ static inline void tracehook_report_exec(struct linux_binfmt *fmt, struct linux_binprm *bprm, struct pt_regs *regs) { - if (!ptrace_event(PT_TRACE_EXEC, PTRACE_EVENT_EXEC, 0) && + if (!ptrace_event(PTRACE_EVENT_EXEC, 0) && unlikely(current->ptrace & PT_PTRACED)) send_sig(SIGTRAP, current, 0); } @@ -218,7 +218,7 @@ static inline void tracehook_report_exec(struct linux_binfmt *fmt, */ static inline void tracehook_report_exit(long *exit_code) { - ptrace_event(PT_TRACE_EXIT, PTRACE_EVENT_EXIT, *exit_code); + ptrace_event(PTRACE_EVENT_EXIT, *exit_code); } /** @@ -232,19 +232,19 @@ static inline void tracehook_report_exit(long *exit_code) */ static inline int tracehook_prepare_clone(unsigned clone_flags) { + int event = 0; + if (clone_flags & CLONE_UNTRACED) return 0; - if (clone_flags & CLONE_VFORK) { - if (current->ptrace & PT_TRACE_VFORK) - return PTRACE_EVENT_VFORK; - } else if ((clone_flags & CSIGNAL) != SIGCHLD) { - if (current->ptrace & PT_TRACE_CLONE) - return PTRACE_EVENT_CLONE; - } else if (current->ptrace & PT_TRACE_FORK) - return PTRACE_EVENT_FORK; + if (clone_flags & CLONE_VFORK) + event = PTRACE_EVENT_VFORK; + else if ((clone_flags & CSIGNAL) != SIGCHLD) + event = PTRACE_EVENT_CLONE; + else + event = PTRACE_EVENT_FORK; - return 0; + return ptrace_event_enabled(current, event) ? event : 0; } /** @@ -318,7 +318,7 @@ static inline void tracehook_report_clone_complete(int trace, struct task_struct *child) { if (unlikely(trace)) - ptrace_event(0, trace, pid); + ptrace_event(trace, pid); } /** @@ -336,7 +336,7 @@ static inline void tracehook_report_clone_complete(int trace, static inline void tracehook_report_vfork_done(struct task_struct *child, pid_t pid) { - ptrace_event(PT_TRACE_VFORK_DONE, PTRACE_EVENT_VFORK_DONE, pid); + ptrace_event(PTRACE_EVENT_VFORK_DONE, pid); } /** |