bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-04-24 14:07:52 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

ptrace: introduce ptrace_event_enabled() and simplify ptrace_event() and tracehook_prepare_clone()

Browse source 
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>
This commit is contained in:
Tejun Heo 2011-06-17 16:50:35 +02:00 • committed by Oleg Nesterov
parent d21142ece4
commit 643ad8388e
2 changed files with 45 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files

26
include/linux/tracehook.h
View file

@ -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);
}
/**