diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-01-24 00:55:51 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-24 01:37:02 +0100 |
| commit | 63e46b95e9eae1161832bf45cb40bbad37bfb182 (patch) | |
| tree | 642f1ba4567fabd0358a45d77dc653ab98adac14 /fs/exec.c | |
| parent | exec:check_unsafe_exec: kill the dead -EAGAIN and clear_in_exec logic (diff) | |
| download | linux-63e46b95e9eae1161832bf45cb40bbad37bfb182.tar.xz linux-63e46b95e9eae1161832bf45cb40bbad37bfb182.zip | |
exec: move the final allow_write_access/fput into free_bprm()
Both success/failure paths cleanup bprm->file, we can move this
code into free_bprm() to simlify and cleanup this logic.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/fs/exec.c b/fs/exec.c index 389fe7b0ba14..f860866e04ba 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1138,9 +1138,7 @@ void setup_new_exec(struct linux_binprm * bprm) /* An exec changes our domain. We are no longer part of the thread group */ - current->self_exec_id++; - flush_signal_handlers(current, 0); do_close_on_exec(current->files); } @@ -1172,6 +1170,10 @@ void free_bprm(struct linux_binprm *bprm) mutex_unlock(¤t->signal->cred_guard_mutex); abort_creds(bprm->cred); } + if (bprm->file) { + allow_write_access(bprm->file); + fput(bprm->file); + } /* If a binfmt changed the interp, free it. */ if (bprm->interp != bprm->filename) kfree(bprm->interp); @@ -1424,12 +1426,6 @@ static int exec_binprm(struct linux_binprm *bprm) ptrace_event(PTRACE_EVENT_EXEC, old_vpid); current->did_exec = 1; proc_exec_connector(current); - - if (bprm->file) { - allow_write_access(bprm->file); - fput(bprm->file); - bprm->file = NULL; /* to catch use-after-free */ - } } return ret; @@ -1492,7 +1488,7 @@ static int do_execve_common(const char *filename, retval = bprm_mm_init(bprm); if (retval) - goto out_file; + goto out_unmark; bprm->argc = count(argv, MAX_ARG_STRINGS); if ((retval = bprm->argc) < 0) @@ -1539,12 +1535,6 @@ out: mmput(bprm->mm); } -out_file: - if (bprm->file) { - allow_write_access(bprm->file); - fput(bprm->file); - } - out_unmark: current->fs->in_exec = 0; current->in_execve = 0; |