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authorRoland McGrath <roland@redhat.com>2008-07-26 06:45:49 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 23:00:08 +0400
commit0d094efeb1e98010c6b99923f1eb7e17bf1e3a74 (patch)
tree6ee271b6da5796e5321d2ab6f9d7d9ba03c300a2 /security
parentdae33574dcf5211e1f43c7e45fa29f73ba3e00cb (diff)
downloadlinux-0d094efeb1e98010c6b99923f1eb7e17bf1e3a74.tar.xz
tracehook: tracehook_tracer_task
This adds the tracehook_tracer_task() hook to consolidate all forms of "Who is using ptrace on me?" logic. This is used for "TracerPid:" in /proc and for permission checks. We also clean up the selinux code the called an identical accessor. 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>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c22
1 files changed, 3 insertions, 19 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 63f131fc42e4..3481cde5bf15 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -25,7 +25,7 @@
#include <linux/init.h>
#include <linux/kernel.h>
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/security.h>
@@ -1971,22 +1971,6 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
return __vm_enough_memory(mm, pages, cap_sys_admin);
}
-/**
- * task_tracer_task - return the task that is tracing the given task
- * @task: task to consider
- *
- * Returns NULL if noone is tracing @task, or the &struct task_struct
- * pointer to its tracer.
- *
- * Must be called under rcu_read_lock().
- */
-static struct task_struct *task_tracer_task(struct task_struct *task)
-{
- if (task->ptrace & PT_PTRACED)
- return rcu_dereference(task->parent);
- return NULL;
-}
-
/* binprm security operations */
static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
@@ -2238,7 +2222,7 @@ static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
u32 ptsid = 0;
rcu_read_lock();
- tracer = task_tracer_task(current);
+ tracer = tracehook_tracer_task(current);
if (likely(tracer != NULL)) {
sec = tracer->security;
ptsid = sec->sid;
@@ -5247,7 +5231,7 @@ static int selinux_setprocattr(struct task_struct *p,
Otherwise, leave SID unchanged and fail. */
task_lock(p);
rcu_read_lock();
- tracer = task_tracer_task(p);
+ tracer = tracehook_tracer_task(p);
if (tracer != NULL) {
struct task_security_struct *ptsec = tracer->security;
u32 ptsid = ptsec->sid;