From 139ee080b6b428240bf49f3e6361f3ac729f891a Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 24 Nov 2009 18:24:14 -0800 Subject: [PATCH] Prevent unintended file desriptor leak in grantpt. The pt_chown program is completely transparently called. It might not be able to live with the various file descriptors the program has open at the time of the call (e.g., under SELinux). Close all but the needed descriptor and connect stdin, stdout, and stderr with /dev/null. pt_chown shouldn't print anything when called to do real work. --- ChangeLog | 6 +++++ login/programs/pt_chown.c | 5 ++-- sysdeps/unix/grantpt.c | 4 +++ sysdeps/unix/sysv/linux/grantpt.c | 42 +++++++++++++++++++++++++++++++ 4 files changed, 54 insertions(+), 3 deletions(-) create mode 100644 sysdeps/unix/sysv/linux/grantpt.c diff --git a/ChangeLog b/ChangeLog index c78e1905e0..173fe780f8 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,11 @@ 2009-11-24 Ulrich Drepper + * sysdeps/unix/grantpt.c (grantpt): Use CLOSE_ALL_FDS is available + before the exec. + * sysdeps/unix/sysv/linux/grantpt.c: New file. + * login/programs/pt_chown.c (main): Don't print message on errors + when doing real work. + * sysdeps/unix/grantpt.c (grantpt): Only get tty group information once. diff --git a/login/programs/pt_chown.c b/login/programs/pt_chown.c index 7e279a5f3b..4c36f2ceac 100644 --- a/login/programs/pt_chown.c +++ b/login/programs/pt_chown.c @@ -154,8 +154,7 @@ main (int argc, char *argv[]) # define ncap_list (sizeof (cap_list) / sizeof (cap_list[0])) cap_t caps = cap_init (); if (caps == NULL) - error (FAIL_ENOMEM, errno, - _("Failed to initialize drop of capabilities")); + return FAIL_ENOMEM; /* There is no reason why these should not work. */ cap_set_flag (caps, CAP_PERMITTED, ncap_list, cap_list, CAP_SET); @@ -166,7 +165,7 @@ main (int argc, char *argv[]) cap_free (caps); if (__builtin_expect (res != 0, 0)) - error (FAIL_EXEC, errno, _("cap_set_proc failed")); + return FAIL_EXEC; } #endif diff --git a/sysdeps/unix/grantpt.c b/sysdeps/unix/grantpt.c index e140fb2850..2a7a963162 100644 --- a/sysdeps/unix/grantpt.c +++ b/sysdeps/unix/grantpt.c @@ -194,6 +194,10 @@ grantpt (int fd) if (__dup2 (fd, PTY_FILENO) < 0) _exit (FAIL_EBADF); +#ifdef CLOSE_ALL_FDS + CLOSE_ALL_FDS (); +#endif + execle (_PATH_PT_CHOWN, basename (_PATH_PT_CHOWN), NULL, NULL); _exit (FAIL_EXEC); } diff --git a/sysdeps/unix/sysv/linux/grantpt.c b/sysdeps/unix/sysv/linux/grantpt.c new file mode 100644 index 0000000000..6305ed4944 --- /dev/null +++ b/sysdeps/unix/sysv/linux/grantpt.c @@ -0,0 +1,42 @@ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "not-cancel.h" +#include "pty-private.h" + + +/* Close all file descriptors except the one specified. */ +static void +close_all_fds (void) +{ + DIR *dir = opendir ("/proc/self/fd"); + if (dir != NULL) + { + struct dirent64 *d; + while ((d = readdir64 (dir)) != NULL) + if (isdigit (d->d_name[0])) + { + char *endp; + long int fd = strtol (d->d_name, &endp, 10); + if (*endp == '\0' && fd != PTY_FILENO && fd != dirfd (dir)) + close_not_cancel_no_status (fd); + } + + closedir (dir); + + int nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_RDONLY); + assert (nullfd == STDIN_FILENO); + nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_WRONLY); + assert (nullfd == STDOUT_FILENO); + __dup2 (STDOUT_FILENO, STDERR_FILENO); + } +} +#define CLOSE_ALL_FDS() close_all_fds() + +#include