diff options
| author | Denys Vlasenko <vda.linux@googlemail.com> | 2017-01-07 10:15:01 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2017-01-07 10:16:56 +0100 |
| commit | 86584e134eec1a81298149f8c04c77727f6dccb9 (patch) | |
| tree | 6e3323d82c8dc1c2c7da58fa86573ca1cea33e71 /shell/ash.c | |
| parent | fe93624fb69e3858ebaea2d9e53e0522c1025698 (diff) | |
| download | busybox-86584e134eec1a81298149f8c04c77727f6dccb9.tar.gz | |
ash: fix open fds leaking in redirects. Closes 9561
commit e19923f6652a638ac39c84012e97f52cf5a7568e deleted clearredir()
call in shellexec():
ash: [REDIR] Remove redundant CLOEXEC calls
Upstream commit:
Now that we're marking file descriptors as CLOEXEC in savefd, we no longer
need to close them on exec or in setinputfd.
but it missed one place where we don't set CLOEXEC. Fixing this.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell/ash.c')
| -rw-r--r-- | shell/ash.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/shell/ash.c b/shell/ash.c index aee3d419c..efb4615db 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -5433,11 +5433,11 @@ redirect(union node *redir, int flags) /* Careful to not accidentally "save" * to the same fd as right side fd in N>&M */ int minfd = right_fd < 10 ? 10 : right_fd + 1; +#if defined(F_DUPFD_CLOEXEC) + i = fcntl(fd, F_DUPFD_CLOEXEC, minfd); +#else i = fcntl(fd, F_DUPFD, minfd); -/* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds - * are closed in popredir() in the child, preventing them from leaking - * into child. (popredir() also cleans up the mess in case of failures) - */ +#endif if (i == -1) { i = errno; if (i != EBADF) { @@ -5452,6 +5452,9 @@ redirect(union node *redir, int flags) remember_to_close: i = CLOSED; } else { /* fd is open, save its copy */ +#if !defined(F_DUPFD_CLOEXEC) + fcntl(i, F_SETFD, FD_CLOEXEC); +#endif /* "exec fd>&-" should not close fds * which point to script file(s). * Force them to be restored afterwards */ |