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| author | Roland McGrath <roland@redhat.com> | 2008-07-25 19:45:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-26 12:00:08 -0700 |
| commit | 0d094efeb1e98010c6b99923f1eb7e17bf1e3a74 (patch) | |
| tree | 6ee271b6da5796e5321d2ab6f9d7d9ba03c300a2 /fs/proc/base.c | |
| parent | dae33574dcf5211e1f43c7e45fa29f73ba3e00cb (diff) | |
| download | linux-0d094efeb1e98010c6b99923f1eb7e17bf1e3a74.tar.gz linux-0d094efeb1e98010c6b99923f1eb7e17bf1e3a74.tar.bz2 linux-0d094efeb1e98010c6b99923f1eb7e17bf1e3a74.zip | |
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 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index a891fe4cb43b..4b74dba69a6d 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -69,6 +69,7 @@ #include <linux/mount.h> #include <linux/security.h> #include <linux/ptrace.h> +#include <linux/tracehook.h> #include <linux/cgroup.h> #include <linux/cpuset.h> #include <linux/audit.h> @@ -231,10 +232,14 @@ static int check_mem_permission(struct task_struct *task) * If current is actively ptrace'ing, and would also be * permitted to freshly attach with ptrace now, permit it. */ - if (task->parent == current && (task->ptrace & PT_PTRACED) && - task_is_stopped_or_traced(task) && - ptrace_may_access(task, PTRACE_MODE_ATTACH)) - return 0; + if (task_is_stopped_or_traced(task)) { + int match; + rcu_read_lock(); + match = (tracehook_tracer_task(task) == current); + rcu_read_unlock(); + if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) + return 0; + } /* * Noone else is allowed. |