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hush: if STANDALONE, close interactive fd for NOEXECed children

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function                                             old     new   delta
pseudo_exec_argv                                     291     305     +14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-07-31 04:54:53 +02:00
parent 32fdf2f9fc
commit bf1c344dfd
1 changed files with 15 additions and 2 deletions
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17
shell/hush.c
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@ -6803,6 +6803,15 @@ static void restore_redirects(struct squirrel *sq)
restore_redirected_FILEs();
}
#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
static void close_saved_fds_and_FILE_list(void)
{
if (G_interactive_fd)
close(G_interactive_fd);
close_all_FILE_list();
}
#endif
static int internally_opened_fd(int fd, struct squirrel *sq)
{
int i;
@ -7325,8 +7334,12 @@ static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
if (a >= 0) {
# if BB_MMU /* see above why on NOMMU it is not allowed */
if (APPLET_IS_NOEXEC(a)) {
/* Do not leak open fds from opened script files etc */
close_all_FILE_list();
/* Do not leak open fds from opened script files etc.
* Testcase: interactive "ls -l /proc/self/fd"
* should not show tty fd open.
*/
close_saved_fds_and_FILE_list();
///FIXME: should also close saved redir fds
debug_printf_exec("running applet '%s'\n", argv[0]);
run_applet_no_and_exit(a, argv[0], argv);
}