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tracehook: exec

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This moves all the ptrace hooks related to exec into tracehook.h inlines.

This also lifts the calls for tracing out of the binfmt load_binary hooks
into search_binary_handler() after it calls into the binfmt module.  This
change has no effect, since all the binfmt modules' load_binary functions
did the call at the end on success, and now search_binary_handler() does
it immediately after return if successful.  We consolidate the repeated
code, and binfmt modules no longer need to import ptrace_notify().

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath 2008-07-25 19:45:44 -07:00 • committed by Linus Torvalds
parent 88ac2921a7
commit 6341c393fc
8 changed files with 50 additions and 38 deletions
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46
include/linux/tracehook.h
View file

@ -48,5 +48,51 @@
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/security.h>
struct linux_binprm;
/**
* tracehook_unsafe_exec - check for exec declared unsafe due to tracing
* @task: current task doing exec
*
* Return %LSM_UNSAFE_* bits applied to an exec because of tracing.
*
* Called with task_lock() held on @task.
*/
static inline int tracehook_unsafe_exec(struct task_struct *task)
{
int unsafe = 0;
int ptrace = task_ptrace(task);
if (ptrace & PT_PTRACED) {
if (ptrace & PT_PTRACE_CAP)
unsafe |= LSM_UNSAFE_PTRACE_CAP;
else
unsafe |= LSM_UNSAFE_PTRACE;
}
return unsafe;
}
/**
* tracehook_report_exec - a successful exec was completed
* @fmt: &struct linux_binfmt that performed the exec
* @bprm: &struct linux_binprm containing exec details
* @regs: user-mode register state
*
* An exec just completed, we are shortly going to return to user mode.
* The freshly initialized register state can be seen and changed in @regs.
* The name, file and other pointers in @bprm are still on hand to be
* inspected, but will be freed as soon as this returns.
*
* Called with no locks, but with some kernel resources held live
* and a reference on @fmt->module.
*/
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) &&
unlikely(task_ptrace(current) & PT_PTRACED))
send_sig(SIGTRAP, current, 0);
}
#endif /* <linux/tracehook.h> */