X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fjournal%2Fcoredump.c;h=d322e7984c51d51a0004a4cfba2154a37ab50c88;hp=1b8c2e8bc0eeff2714caca579051d4dda0125e66;hb=f8eeeaf9b783ebbab30672629abf3920db286811;hpb=3b1a55e110ab387a8d213581983e20c0a63d7894 diff --git a/src/journal/coredump.c b/src/journal/coredump.c index 1b8c2e8bc..d322e7984 100644 --- a/src/journal/coredump.c +++ b/src/journal/coredump.c @@ -26,11 +26,17 @@ #include #include -#include -#include +#ifdef HAVE_ELFUTILS +# include +# include +#endif + +#include "systemd/sd-journal.h" +#include "systemd/sd-login.h" #include "log.h" #include "util.h" +#include "fileio.h" #include "strv.h" #include "macro.h" #include "mkdir.h" @@ -43,11 +49,7 @@ #include "path-util.h" #include "compress.h" #include "coredump-vacuum.h" - -#ifdef HAVE_ACL -# include -# include "acl-util.h" -#endif +#include "acl-util.h" /* The maximum size up to which we process coredumps */ #define PROCESS_SIZE_MAX ((off_t) (2LLU*1024LLU*1024LLU*1024LLU)) @@ -61,8 +63,8 @@ #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) /* Make sure to not make this larger than the maximum journal entry - * size. See ENTRY_SIZE_MAX in journald-native.c. */ -assert_cc(JOURNAL_SIZE_MAX <= ENTRY_SIZE_MAX); + * size. See DATA_SIZE_MAX in journald-native.c. */ +assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); enum { INFO_PID, @@ -114,16 +116,11 @@ static int parse_config(void) { {} }; - return config_parse( - NULL, - "/etc/systemd/coredump.conf", - NULL, - "Coredump\0", - config_item_table_lookup, - (void*) items, - false, - false, - NULL); + return config_parse_many("/etc/systemd/coredump.conf", + CONF_DIRS_NULSTR("systemd/coredump.conf"), + "Coredump\0", + config_item_table_lookup, items, + false, NULL); } static int fix_acl(int fd, uid_t uid) { @@ -142,29 +139,25 @@ static int fix_acl(int fd, uid_t uid) { * their own coredumps */ acl = acl_get_fd(fd); - if (!acl) { - log_error("Failed to get ACL: %m"); - return -errno; - } + if (!acl) + return log_error_errno(errno, "Failed to get ACL: %m"); if (acl_create_entry(&acl, &entry) < 0 || acl_set_tag_type(entry, ACL_USER) < 0 || acl_set_qualifier(entry, &uid) < 0) { - log_error("Failed to patch ACL: %m"); + log_error_errno(errno, "Failed to patch ACL: %m"); return -errno; } if (acl_get_permset(entry, &permset) < 0 || acl_add_perm(permset, ACL_READ) < 0 || calc_acl_mask_if_needed(&acl) < 0) { - log_warning("Failed to patch ACL: %m"); + log_warning_errno(errno, "Failed to patch ACL: %m"); return -errno; } - if (acl_set_fd(fd, acl) < 0) { - log_error("Failed to apply ACL: %m"); - return -errno; - } + if (acl_set_fd(fd, acl) < 0) + return log_error_errno(errno, "Failed to apply ACL: %m"); #endif return 0; @@ -223,15 +216,11 @@ static int fix_permissions( fix_acl(fd, uid); fix_xattr(fd, info); - if (fsync(fd) < 0) { - log_error("Failed to sync coredump %s: %m", filename); - return -errno; - } + if (fsync(fd) < 0) + return log_error_errno(errno, "Failed to sync coredump %s: %m", filename); - if (rename(filename, target) < 0) { - log_error("Failed to rename coredump %s -> %s: %m", filename, target); - return -errno; - } + if (rename(filename, target) < 0) + return log_error_errno(errno, "Failed to rename coredump %s -> %s: %m", filename, target); return 0; } @@ -247,10 +236,8 @@ static int maybe_remove_external_coredump(const char *filename, off_t size) { if (!filename) return 1; - if (unlink(filename) < 0 && errno != ENOENT) { - log_error("Failed to unlink %s: %m", filename); - return -errno; - } + if (unlink(filename) < 0 && errno != ENOENT) + return log_error_errno(errno, "Failed to unlink %s: %m", filename); return 1; } @@ -312,42 +299,38 @@ static int save_external_coredump( assert(ret_size); r = make_filename(info, &fn); - if (r < 0) { - log_error("Failed to determine coredump file name: %s", strerror(-r)); - return r; - } + if (r < 0) + return log_error_errno(r, "Failed to determine coredump file name: %m"); - tmp = tempfn_random(fn); - if (!tmp) - return log_oom(); + r = tempfn_random(fn, &tmp); + if (r < 0) + return log_error_errno(r, "Failed to determine temporary file name: %m"); mkdir_p_label("/var/lib/systemd/coredump", 0755); fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); - if (fd < 0) { - log_error("Failed to create coredump file %s: %m", tmp); - return -errno; - } + if (fd < 0) + return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp); - r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); - if (r == -E2BIG) { + r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max, false); + if (r == -EFBIG) { log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); goto fail; } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); goto fail; } else if (r < 0) { - log_error("Failed to dump coredump to file: %s", strerror(-r)); + log_error_errno(r, "Failed to dump coredump to file: %m"); goto fail; } if (fstat(fd, &st) < 0) { - log_error("Failed to fstat coredump %s: %m", tmp); + log_error_errno(errno, "Failed to fstat coredump %s: %m", tmp); goto fail; } if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { - log_error("Failed to seek on %s: %m", tmp); + log_error_errno(errno, "Failed to seek on %s: %m", tmp); goto fail; } @@ -365,21 +348,21 @@ static int save_external_coredump( goto uncompressed; } - tmp_compressed = tempfn_random(fn_compressed); - if (!tmp_compressed) { - log_oom(); + r = tempfn_random(fn_compressed, &tmp_compressed); + if (r < 0) { + log_error_errno(r, "Failed to determine temporary file name for %s: %m", fn_compressed); goto uncompressed; } fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); if (fd_compressed < 0) { - log_error("Failed to create file %s: %m", tmp_compressed); + log_error_errno(errno, "Failed to create file %s: %m", tmp_compressed); goto uncompressed; } r = compress_stream(fd, fd_compressed, -1); if (r < 0) { - log_error("Failed to compress %s: %s", tmp_compressed, strerror(-r)); + log_error_errno(r, "Failed to compress %s: %m", tmp_compressed); goto fail_compressed; } @@ -431,10 +414,8 @@ static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_s assert(ret); assert(ret_size); - if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { - log_warning("Failed to seek: %m"); - return -errno; - } + if (lseek(fd, 0, SEEK_SET) == (off_t) -1) + return log_warning_errno(errno, "Failed to seek: %m"); field = malloc(9 + size); if (!field) { @@ -445,10 +426,8 @@ static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_s memcpy(field, "COREDUMP=", 9); n = read(fd, field + 9, size); - if (n < 0) { - log_error("Failed to read core data: %s", strerror(-n)); - return (int) n; - } + if (n < 0) + return log_error_errno((int) n, "Failed to read core data: %m"); if ((size_t) n < size) { log_error("Core data too short."); return -EIO; @@ -462,24 +441,118 @@ static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_s return 0; } +/* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: + * 0:/dev/pts/23 + * pos: 0 + * flags: 0100002 + * + * 1:/dev/pts/23 + * pos: 0 + * flags: 0100002 + * + * 2:/dev/pts/23 + * pos: 0 + * flags: 0100002 + * EOF + */ +static int compose_open_fds(pid_t pid, char **open_fds) { + _cleanup_closedir_ DIR *proc_fd_dir = NULL; + _cleanup_close_ int proc_fdinfo_fd = -1; + _cleanup_free_ char *buffer = NULL; + _cleanup_fclose_ FILE *stream = NULL; + const char *fddelim = "", *path; + struct dirent *dent = NULL; + size_t size = 0; + int r = 0; + + assert(pid >= 0); + assert(open_fds != NULL); + + path = procfs_file_alloca(pid, "fd"); + proc_fd_dir = opendir(path); + if (!proc_fd_dir) + return -errno; + + proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); + if (proc_fdinfo_fd < 0) + return -errno; + + stream = open_memstream(&buffer, &size); + if (!stream) + return -ENOMEM; + + FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { + _cleanup_fclose_ FILE *fdinfo = NULL; + _cleanup_free_ char *fdname = NULL; + char line[LINE_MAX]; + int fd; + + r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); + if (r < 0) + return r; + + fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); + fddelim = "\n"; + + /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ + fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); + if (fd < 0) + continue; + + fdinfo = fdopen(fd, "re"); + if (fdinfo == NULL) { + close(fd); + continue; + } + + FOREACH_LINE(line, fdinfo, break) { + fputs(line, stream); + if (!endswith(line, "\n")) + fputc('\n', stream); + } + } + + errno = 0; + fclose(stream); + stream = NULL; + + if (errno != 0) + return -errno; + + *open_fds = buffer; + buffer = NULL; + + return 0; +} + int main(int argc, char* argv[]) { - _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, - *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, - *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, - *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, - *exe = NULL, *comm = NULL, *filename = NULL; + /* The small core field we allocate on the stack, to keep things simple */ + char + *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, + *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL, + *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL, + *core_slice = NULL; + + /* The larger ones we allocate on the heap */ + _cleanup_free_ char + *core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL, + *core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL, + *core_proc_cgroup = NULL, *core_environ = NULL; + + _cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL; const char *info[_INFO_LEN]; _cleanup_close_ int coredump_fd = -1; - struct iovec iovec[18]; + struct iovec iovec[26]; off_t coredump_size; int r, j = 0; uid_t uid, owner_uid; gid_t gid; pid_t pid; char *t; + const char *p; /* Make sure we never enter a loop */ prctl(PR_SET_DUMPABLE, 0); @@ -522,7 +595,7 @@ int main(int argc, char* argv[]) { } if (get_process_comm(pid, &comm) < 0) { - log_warning("Failed to get COMM, falling back to the commandline."); + log_warning("Failed to get COMM, falling back to the command line."); comm = strv_join(argv + INFO_COMM + 1, " "); } @@ -540,6 +613,7 @@ int main(int argc, char* argv[]) { if (cg_pid_get_unit(pid, &t) >= 0) { if (streq(t, SPECIAL_JOURNALD_SERVICE)) { + free(t); /* If we are journald, we cut things short, * don't write to the journal, but still @@ -560,9 +634,13 @@ int main(int argc, char* argv[]) { goto finish; } - core_unit = strappend("COREDUMP_UNIT=", t); - } else if (cg_pid_get_user_unit(pid, &t) >= 0) - core_unit = strappend("COREDUMP_USER_UNIT=", t); + core_unit = strappenda("COREDUMP_UNIT=", t); + free(t); + + } else if (cg_pid_get_user_unit(pid, &t) >= 0) { + core_unit = strappenda("COREDUMP_USER_UNIT=", t); + free(t); + } if (core_unit) IOVEC_SET_STRING(iovec[j++], core_unit); @@ -572,71 +650,127 @@ int main(int argc, char* argv[]) { log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); log_open(); - core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); - if (core_pid) - IOVEC_SET_STRING(iovec[j++], core_pid); + core_pid = strappenda("COREDUMP_PID=", info[INFO_PID]); + IOVEC_SET_STRING(iovec[j++], core_pid); - core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); - if (core_uid) - IOVEC_SET_STRING(iovec[j++], core_uid); + core_uid = strappenda("COREDUMP_UID=", info[INFO_UID]); + IOVEC_SET_STRING(iovec[j++], core_uid); - core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); - if (core_gid) - IOVEC_SET_STRING(iovec[j++], core_gid); + core_gid = strappenda("COREDUMP_GID=", info[INFO_GID]); + IOVEC_SET_STRING(iovec[j++], core_gid); - core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); - if (core_signal) - IOVEC_SET_STRING(iovec[j++], core_signal); + core_signal = strappenda("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); + IOVEC_SET_STRING(iovec[j++], core_signal); if (sd_pid_get_session(pid, &t) >= 0) { - core_session = strappend("COREDUMP_SESSION=", t); + core_session = strappenda("COREDUMP_SESSION=", t); free(t); - if (core_session) - IOVEC_SET_STRING(iovec[j++], core_session); + IOVEC_SET_STRING(iovec[j++], core_session); } if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { - asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); - - if (core_owner_uid) + r = asprintf(&core_owner_uid, + "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); + if (r > 0) IOVEC_SET_STRING(iovec[j++], core_owner_uid); } if (sd_pid_get_slice(pid, &t) >= 0) { - core_slice = strappend("COREDUMP_SLICE=", t); + core_slice = strappenda("COREDUMP_SLICE=", t); free(t); - if (core_slice) - IOVEC_SET_STRING(iovec[j++], core_slice); + IOVEC_SET_STRING(iovec[j++], core_slice); } if (comm) { - core_comm = strappend("COREDUMP_COMM=", comm); - if (core_comm) - IOVEC_SET_STRING(iovec[j++], core_comm); + core_comm = strappenda("COREDUMP_COMM=", comm); + IOVEC_SET_STRING(iovec[j++], core_comm); } if (exe) { - core_exe = strappend("COREDUMP_EXE=", exe); - if (core_exe) - IOVEC_SET_STRING(iovec[j++], core_exe); + core_exe = strappenda("COREDUMP_EXE=", exe); + IOVEC_SET_STRING(iovec[j++], core_exe); } if (get_process_cmdline(pid, 0, false, &t) >= 0) { - core_cmdline = strappend("COREDUMP_CMDLINE=", t); + core_cmdline = strappenda("COREDUMP_CMDLINE=", t); free(t); - if (core_cmdline) - IOVEC_SET_STRING(iovec[j++], core_cmdline); + IOVEC_SET_STRING(iovec[j++], core_cmdline); } if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { - core_cgroup = strappend("COREDUMP_CGROUP=", t); + core_cgroup = strappenda("COREDUMP_CGROUP=", t); + free(t); + + IOVEC_SET_STRING(iovec[j++], core_cgroup); + } + + if (compose_open_fds(pid, &t) >= 0) { + core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); + free(t); + + if (core_open_fds) + IOVEC_SET_STRING(iovec[j++], core_open_fds); + } + + p = procfs_file_alloca(pid, "status"); + if (read_full_file(p, &t, NULL) >= 0) { + core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); + free(t); + + if (core_proc_status) + IOVEC_SET_STRING(iovec[j++], core_proc_status); + } + + p = procfs_file_alloca(pid, "maps"); + if (read_full_file(p, &t, NULL) >= 0) { + core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); + free(t); + + if (core_proc_maps) + IOVEC_SET_STRING(iovec[j++], core_proc_maps); + } + + p = procfs_file_alloca(pid, "limits"); + if (read_full_file(p, &t, NULL) >= 0) { + core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); + free(t); + + if (core_proc_limits) + IOVEC_SET_STRING(iovec[j++], core_proc_limits); + } + + p = procfs_file_alloca(pid, "cgroup"); + if (read_full_file(p, &t, NULL) >=0) { + core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); + free(t); + + if (core_proc_cgroup) + IOVEC_SET_STRING(iovec[j++], core_proc_cgroup); + } + + if (get_process_cwd(pid, &t) >= 0) { + core_cwd = strappenda("COREDUMP_CWD=", t); + free(t); + + IOVEC_SET_STRING(iovec[j++], core_cwd); + } + + if (get_process_root(pid, &t) >= 0) { + core_root = strappenda("COREDUMP_ROOT=", t); + free(t); + + IOVEC_SET_STRING(iovec[j++], core_root); + } + + if (get_process_environ(pid, &t) >= 0) { + core_environ = strappend("COREDUMP_ENVIRON=", t); free(t); - if (core_cgroup) - IOVEC_SET_STRING(iovec[j++], core_cgroup); + if (core_environ) + IOVEC_SET_STRING(iovec[j++], core_environ); } core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); @@ -674,12 +808,12 @@ int main(int argc, char* argv[]) { /* Now, let's drop privileges to become the user who owns the * segfaulted process and allocate the coredump memory under - * his uid. This also ensures that the credentials journald - * will see are the ones of the coredumping user, thus making - * sure the user himself gets access to the core dump. */ + * the user's uid. This also ensures that the credentials + * journald will see are the ones of the coredumping user, + * thus making sure the user gets access to the core dump. */ if (setresgid(gid, gid, gid) < 0 || setresuid(uid, uid, uid) < 0) { - log_error("Failed to drop privileges: %m"); + log_error_errno(errno, "Failed to drop privileges: %m"); r = -errno; goto finish; } @@ -692,8 +826,10 @@ int main(int argc, char* argv[]) { r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); if (r >= 0) core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); + else if (r == -EINVAL) + log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); else - log_warning("Failed to generate stack trace: %s", strerror(-r)); + log_warning_errno(r, "Failed to generate stack trace: %m"); } if (!core_message) @@ -720,7 +856,7 @@ log: r = sd_journal_sendv(iovec, j); if (r < 0) - log_error("Failed to log coredump: %s", strerror(-r)); + log_error_errno(r, "Failed to log coredump: %m"); finish: return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;