diff options
| author | Al Viro <viro@ZenIV.linux.org.uk> | 2008-01-02 14:09:57 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-02 13:13:27 -0800 |
| commit | 831830b5a2b5d413407adf380ef62fe17d6fcbf2 (patch) | |
| tree | b08f54f15374b5b98b0b3bea20a1d2ea8d1f50e0 /kernel/ptrace.c | |
| parent | ac40532ef0b8649e6f7f83859ea0de1c4ed08a19 (diff) | |
restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid
Contents of /proc/*/maps is sensitive and may become sensitive after
open() (e.g. if target originally shares our ->mm and later does exec
on suid-root binary).
Check at read() (actually, ->start() of iterator) time that mm_struct
we'd grabbed and locked is
- still the ->mm of target
- equal to reader's ->mm or the target is ptracable by reader.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 7c76f2ffaeaa..0c65d306f412 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -120,7 +120,7 @@ int ptrace_check_attach(struct task_struct *child, int kill) return ret; } -static int may_attach(struct task_struct *task) +int __ptrace_may_attach(struct task_struct *task) { /* May we inspect the given task? * This check is used both for attaching with ptrace @@ -154,7 +154,7 @@ int ptrace_may_attach(struct task_struct *task) { int err; task_lock(task); - err = may_attach(task); + err = __ptrace_may_attach(task); task_unlock(task); return !err; } |