diff options
Diffstat (limited to 'shell/hush.c')
| -rw-r--r-- | shell/hush.c | 52 |
1 files changed, 42 insertions, 10 deletions
diff --git a/shell/hush.c b/shell/hush.c index d4101d66f..cc785d36b 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -1546,6 +1546,16 @@ static void close_all_FILE_list(void) } } #endif +static int fd_in_FILEs(int fd) +{ + struct FILE_list *fl = G.FILE_list; + while (fl) { + if (fl->fd == fd) + return 1; + fl = fl->next; + } + return 0; +} /* Helpers for setting new $n and restoring them back @@ -6686,9 +6696,9 @@ static struct squirrel *append_squirrel(struct squirrel *sq, int i, int orig, in static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd) { int moved_to; - int i = 0; + int i; - if (sq) while (sq[i].orig_fd >= 0) { + if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) { /* If we collide with an already moved fd... */ if (fd == sq[i].moved_to) { sq[i].moved_to = fcntl_F_DUPFD(sq[i].moved_to, avoid_fd); @@ -6702,7 +6712,6 @@ static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd) debug_printf_redir("redirect_fd %d: already moved\n", fd); return sq; } - i++; } /* If this fd is open, we move and remember it; if it's closed, moved_to = -1 */ @@ -6717,8 +6726,7 @@ static struct squirrel *add_squirrel_closed(struct squirrel *sq, int fd) { int i; - i = 0; - if (sq) while (sq[i].orig_fd >= 0) { + if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) { /* If we collide with an already moved fd... */ if (fd == sq[i].orig_fd) { /* Examples: @@ -6730,7 +6738,6 @@ static struct squirrel *add_squirrel_closed(struct squirrel *sq, int fd) debug_printf_redir("redirect_fd %d: already moved or closed\n", fd); return sq; } - i++; } debug_printf_redir("redirect_fd %d: previous fd was closed\n", fd); @@ -6747,7 +6754,8 @@ static int save_fd_on_redirect(int fd, int avoid_fd, struct squirrel **sqp) avoid_fd = 9; #if ENABLE_HUSH_INTERACTIVE - if (fd != 0 && fd == G.interactive_fd) { + if (fd == G.interactive_fd) { + /* Testcase: "ls -l /proc/$$/fd 255>&-" should work */ G.interactive_fd = xdup_CLOEXEC_and_close(G.interactive_fd, avoid_fd); debug_printf_redir("redirect_fd %d: matches interactive_fd, moving it to %d\n", fd, G.interactive_fd); return 1; /* "we closed fd" */ @@ -6775,8 +6783,8 @@ static int save_fd_on_redirect(int fd, int avoid_fd, struct squirrel **sqp) static void restore_redirects(struct squirrel *sq) { if (sq) { - int i = 0; - while (sq[i].orig_fd >= 0) { + int i; + for (i = 0; sq[i].orig_fd >= 0; i++) { if (sq[i].moved_to >= 0) { /* We simply die on error */ debug_printf_redir("restoring redirected fd from %d to %d\n", sq[i].moved_to, sq[i].orig_fd); @@ -6786,7 +6794,6 @@ static void restore_redirects(struct squirrel *sq) debug_printf_redir("restoring redirected fd %d: closing it\n", sq[i].orig_fd); close(sq[i].orig_fd); } - i++; } free(sq); } @@ -6796,6 +6803,25 @@ static void restore_redirects(struct squirrel *sq) restore_redirected_FILEs(); } +static int internally_opened_fd(int fd, struct squirrel *sq) +{ + int i; + +#if ENABLE_HUSH_INTERACTIVE + if (fd == G.interactive_fd) + return 1; +#endif + /* If this one of script's fds? */ + if (fd_in_FILEs(fd)) + return 1; + + if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) { + if (fd == sq[i].moved_to) + return 1; + } + return 0; +} + /* squirrel != NULL means we squirrel away copies of stdin, stdout, * and stderr if they are redirected. */ static int setup_redirects(struct command *prog, struct squirrel **sqp) @@ -6878,6 +6904,12 @@ static int setup_redirects(struct command *prog, struct squirrel **sqp) * and second redirect closes 3! Restore code then closes 3 again. */ } else { + /* if newfd is a script fd or saved fd, simulate EBADF */ + if (internally_opened_fd(newfd, sqp ? *sqp : NULL)) { + //errno = EBADF; + //bb_perror_msg_and_die("can't duplicate file descriptor"); + newfd = -1; /* same effect as code above */ + } xdup2(newfd, redir->rd_fd); if (redir->rd_dup == REDIRFD_TO_FILE) /* "rd_fd > FILE" */ |