diff options
Diffstat (limited to 'posix/wordexp.c')
| -rw-r--r-- | posix/wordexp.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/posix/wordexp.c b/posix/wordexp.c index 739df218fb..4bd84ddb7a 100644 --- a/posix/wordexp.c +++ b/posix/wordexp.c @@ -44,6 +44,9 @@ /* #define NDEBUG 1 */ #include <assert.h> +/* Get some device information. */ +#include <device-nrs.h> + /* * This is a recursive-descent-style word expansion routine. */ @@ -840,6 +843,7 @@ exec_comm_child (char *comm, int *fildes, int showerr, int noexec) /* Redirect stderr to /dev/null if we have to. */ if (showerr == 0) { + struct stat64 st; int fd; __close (2); fd = __open (_PATH_DEVNULL, O_WRONLY); @@ -848,6 +852,18 @@ exec_comm_child (char *comm, int *fildes, int showerr, int noexec) __dup2 (fd, 2); __close (fd); } + /* Be paranoid. Check that we actually opened the /dev/null + device. */ + if (__builtin_expect (__fxstat64 (_STAT_VER, 2, &st), 0) != 0 + || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0 +#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR + || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) +#endif + ) + /* It's not the /dev/null device. Stop right here. The + problem is: how do we stop? We use _exit() with an + hopefully unusual exit code. */ + _exit (90); } /* Make sure the subshell doesn't field-split on our behalf. */ |