diff options
Diffstat (limited to 'nscd/nscd.c')
| -rw-r--r-- | nscd/nscd.c | 55 |
1 files changed, 53 insertions, 2 deletions
diff --git a/nscd/nscd.c b/nscd/nscd.c index 5520e1a475..af4b181c7d 100644 --- a/nscd/nscd.c +++ b/nscd/nscd.c @@ -21,10 +21,13 @@ #include <argp.h> #include <assert.h> +#include <dirent.h> #include <errno.h> #include <error.h> +#include <fcntl.h> #include <libintl.h> #include <locale.h> +#include <paths.h> #include <pthread.h> #include <signal.h> #include <stdio.h> @@ -33,10 +36,12 @@ #include <syslog.h> #include <unistd.h> #include <sys/socket.h> +#include <sys/stat.h> #include <sys/un.h> #include "dbg_log.h" #include "nscd.h" +#include <device-nrs.h> /* Get libc version number. */ #include <version.h> @@ -133,8 +138,54 @@ main (int argc, char **argv) if (fork ()) exit (0); - for (i = 0; i < getdtablesize (); i++) - close (i); + int nullfd = open (_PATH_DEVNULL, O_RDWR); + if (nullfd != -1) + { + struct stat64 st; + + if (fstat64 (nullfd, &st) == 0 && S_ISCHR (st.st_mode) != 0 +#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR + && st.st_rdev == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) +#endif + ) + { + /* It is the /dev/null special device alright. */ + (void) dup2 (nullfd, STDIN_FILENO); + (void) dup2 (nullfd, STDOUT_FILENO); + (void) dup2 (nullfd, STDERR_FILENO); + + if (nullfd > 2) + close (nullfd); + } + else + { + /* Ugh, somebody is trying to play a trick on us. */ + close (nullfd); + nullfd = -1; + } + } + int min_close_fd = nullfd == -1 ? 0 : STDERR_FILENO + 1; + + DIR *d = opendir ("/proc/self/fd"); + if (d != NULL) + { + struct dirent64 *dirent; + int dfdn = dirfd (d); + + while ((dirent = readdir64 (d)) != NULL) + { + char *endp; + unsigned long int fdn = strtoul (dirent->d_name, &endp, 10); + + if (*endp == '\0' && fdn != dfdn && fdn >= min_close_fd) + close ((int) fdn); + } + + closedir (d); + } + else + for (i = min_close_fd; i < getdtablesize (); i++) + close (i); if (fork ()) exit (0); |