Description of problem: login(1) has a segmentation fault when the input is an EOF: $ login login: ^D login: ^D Segmentation fault Using gdb: $ gdb login ... (gdb) run Starting program: /bin/login login: ^D login: ^D Program received signal SIGSEGV, Segmentation fault. 0x0015e731 in _nss_files_getpwnam_r (name=0x0, result=0x8f8974, buffer=0x9cac3c0 "root", buflen=1024, errnop=0xb7f96688) at nss_files/files-pwd.c:33 33 DB_LOOKUP (pwnam, 1 + strlen (name), (".%s", name), (gdb) bt #0 0x0015e731 in _nss_files_getpwnam_r (name=0x0, result=0x8f8974, buffer=0x9cac3c0 "root", buflen=1024, errnop=0xb7f96688) at nss_files/files-pwd.c:33 #1 0x00836223 in __getpwnam_r (name=0x0, resbuf=0x8f8974, buffer=0x9cac3c0 "root", buflen=1024, result=0xbfc915e8) at ../nss/getXXbyYY_r.c:210 #2 0x00835ca8 in getpwnam (name=0x0) at ../nss/getXXbyYY.c:116 #3 0x0804b83c in main (argc=0, argv=Cannot access memory at address 0x3e ) at login.c:612 #4 0x007bcf70 in __libc_start_main (main=0x8049f90 <main>, argc=1, ubp_av=0xbfc93cf4, init=0x804c490 <__libc_csu_init>, fini=0x804c480 <__libc_csu_fini>, rtld_fini=0x7963d0 <_dl_fini>, stack_end=0xbfc93cec) at libc-start.c:222 #5 0x08049a21 in _start () Version-Release number of selected component (if applicable): util-linux-2.13-0.54.fc7 How reproducible: Every time.
Hmm... bug in login audit code. Thanks! diff --git a/login-utils/login.c b/login-utils/login.c index e582779..1af8792 100644 --- a/login-utils/login.c +++ b/login-utils/login.c @@ -330,12 +330,12 @@ logaudit(const char *tty, const char *username, const char *hostname, audit_fd = audit_open(); if (audit_fd == -1) return; - if (!pwd) + if (!pwd && username) pwd = getpwnam(username); if (pwd) snprintf(buf, sizeof(buf), "uid=%d", pwd->pw_uid); else - snprintf(buf, sizeof(buf), "acct=%s", username); + snprintf(buf, sizeof(buf), "acct=%s", username ? username : "(unknown)"); audit_log_user_message(audit_fd, AUDIT_USER_LOGIN, buf, hostname, NULL, tty, status);
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