diff options
Diffstat (limited to 'src/coredump/coredump.c')
| -rw-r--r-- | src/coredump/coredump.c | 1302 |
1 files changed, 0 insertions, 1302 deletions
diff --git a/src/coredump/coredump.c b/src/coredump/coredump.c deleted file mode 100644 index a982c204be..0000000000 --- a/src/coredump/coredump.c +++ /dev/null @@ -1,1302 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2012 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <stdio.h> -#include <sys/prctl.h> -#include <sys/xattr.h> -#include <unistd.h> - -#ifdef HAVE_ELFUTILS -#include <dwarf.h> -#include <elfutils/libdwfl.h> -#endif - -#include "sd-daemon.h" -#include "sd-journal.h" -#include "sd-login.h" -#include "sd-messages.h" - -#include "acl-util.h" -#include "alloc-util.h" -#include "capability-util.h" -#include "cgroup-util.h" -#include "compress.h" -#include "conf-parser.h" -#include "copy.h" -#include "coredump-vacuum.h" -#include "dirent-util.h" -#include "escape.h" -#include "fd-util.h" -#include "fileio.h" -#include "fs-util.h" -#include "io-util.h" -#include "journald-native.h" -#include "log.h" -#include "macro.h" -#include "missing.h" -#include "mkdir.h" -#include "parse-util.h" -#include "process-util.h" -#include "socket-util.h" -#include "special.h" -#include "stacktrace.h" -#include "string-table.h" -#include "string-util.h" -#include "strv.h" -#include "user-util.h" -#include "util.h" - -/* The maximum size up to which we process coredumps */ -#define PROCESS_SIZE_MAX ((uint64_t) (2LLU*1024LLU*1024LLU*1024LLU)) - -/* The maximum size up to which we leave the coredump around on disk */ -#define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX - -/* The maximum size up to which we store the coredump in the journal */ -#define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) - -/* Make sure to not make this larger than the maximum journal entry - * size. See DATA_SIZE_MAX in journald-native.c. */ -assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); - -enum { - /* We use this as array indexes for a couple of special fields we use for naming coredumping files, and - * attaching xattrs */ - CONTEXT_PID, - CONTEXT_UID, - CONTEXT_GID, - CONTEXT_SIGNAL, - CONTEXT_TIMESTAMP, - CONTEXT_RLIMIT, - CONTEXT_COMM, - CONTEXT_EXE, - _CONTEXT_MAX -}; - -typedef enum CoredumpStorage { - COREDUMP_STORAGE_NONE, - COREDUMP_STORAGE_EXTERNAL, - COREDUMP_STORAGE_JOURNAL, - _COREDUMP_STORAGE_MAX, - _COREDUMP_STORAGE_INVALID = -1 -} CoredumpStorage; - -static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { - [COREDUMP_STORAGE_NONE] = "none", - [COREDUMP_STORAGE_EXTERNAL] = "external", - [COREDUMP_STORAGE_JOURNAL] = "journal", -}; - -DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); -static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); - -static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; -static bool arg_compress = true; -static uint64_t arg_process_size_max = PROCESS_SIZE_MAX; -static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX; -static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; -static uint64_t arg_keep_free = (uint64_t) -1; -static uint64_t arg_max_use = (uint64_t) -1; - -static int parse_config(void) { - static const ConfigTableItem items[] = { - { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, - { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, - { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max }, - { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max }, - { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, - { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free }, - { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use }, - {} - }; - - return config_parse_many_nulstr(PKGSYSCONFDIR "/coredump.conf", - CONF_PATHS_NULSTR("systemd/coredump.conf.d"), - "Coredump\0", - config_item_table_lookup, items, - false, NULL); -} - -static inline uint64_t storage_size_max(void) { - return arg_storage == COREDUMP_STORAGE_EXTERNAL ? arg_external_size_max : arg_journal_size_max; -} - -static int fix_acl(int fd, uid_t uid) { - -#ifdef HAVE_ACL - _cleanup_(acl_freep) acl_t acl = NULL; - acl_entry_t entry; - acl_permset_t permset; - int r; - - assert(fd >= 0); - - if (uid <= SYSTEM_UID_MAX) - return 0; - - /* Make sure normal users can read (but not write or delete) - * their own coredumps */ - - acl = acl_get_fd(fd); - 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) - return log_error_errno(errno, "Failed to patch ACL: %m"); - - if (acl_get_permset(entry, &permset) < 0 || - acl_add_perm(permset, ACL_READ) < 0) - return log_warning_errno(errno, "Failed to patch ACL: %m"); - - r = calc_acl_mask_if_needed(&acl); - if (r < 0) - return log_warning_errno(r, "Failed to patch ACL: %m"); - - if (acl_set_fd(fd, acl) < 0) - return log_error_errno(errno, "Failed to apply ACL: %m"); -#endif - - return 0; -} - -static int fix_xattr(int fd, const char *context[_CONTEXT_MAX]) { - - static const char * const xattrs[_CONTEXT_MAX] = { - [CONTEXT_PID] = "user.coredump.pid", - [CONTEXT_UID] = "user.coredump.uid", - [CONTEXT_GID] = "user.coredump.gid", - [CONTEXT_SIGNAL] = "user.coredump.signal", - [CONTEXT_TIMESTAMP] = "user.coredump.timestamp", - [CONTEXT_COMM] = "user.coredump.comm", - [CONTEXT_EXE] = "user.coredump.exe", - }; - - int r = 0; - unsigned i; - - assert(fd >= 0); - - /* Attach some metadata to coredumps via extended - * attributes. Just because we can. */ - - for (i = 0; i < _CONTEXT_MAX; i++) { - int k; - - if (isempty(context[i]) || !xattrs[i]) - continue; - - k = fsetxattr(fd, xattrs[i], context[i], strlen(context[i]), XATTR_CREATE); - if (k < 0 && r == 0) - r = -errno; - } - - return r; -} - -#define filename_escape(s) xescape((s), "./ ") - -static inline const char *coredump_tmpfile_name(const char *s) { - return s ? s : "(unnamed temporary file)"; -} - -static int fix_permissions( - int fd, - const char *filename, - const char *target, - const char *context[_CONTEXT_MAX], - uid_t uid) { - - int r; - - assert(fd >= 0); - assert(target); - assert(context); - - /* Ignore errors on these */ - (void) fchmod(fd, 0640); - (void) fix_acl(fd, uid); - (void) fix_xattr(fd, context); - - if (fsync(fd) < 0) - return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename)); - - r = link_tmpfile(fd, filename, target); - if (r < 0) - return log_error_errno(r, "Failed to move coredump %s into place: %m", target); - - return 0; -} - -static int maybe_remove_external_coredump(const char *filename, uint64_t size) { - - /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ - - if (arg_storage == COREDUMP_STORAGE_EXTERNAL && - size <= arg_external_size_max) - return 0; - - if (!filename) - return 1; - - if (unlink(filename) < 0 && errno != ENOENT) - return log_error_errno(errno, "Failed to unlink %s: %m", filename); - - return 1; -} - -static int make_filename(const char *context[_CONTEXT_MAX], char **ret) { - _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; - sd_id128_t boot = {}; - int r; - - assert(context); - - c = filename_escape(context[CONTEXT_COMM]); - if (!c) - return -ENOMEM; - - u = filename_escape(context[CONTEXT_UID]); - if (!u) - return -ENOMEM; - - r = sd_id128_get_boot(&boot); - if (r < 0) - return r; - - p = filename_escape(context[CONTEXT_PID]); - if (!p) - return -ENOMEM; - - t = filename_escape(context[CONTEXT_TIMESTAMP]); - if (!t) - return -ENOMEM; - - if (asprintf(ret, - "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", - c, - u, - SD_ID128_FORMAT_VAL(boot), - p, - t) < 0) - return -ENOMEM; - - return 0; -} - -static int save_external_coredump( - const char *context[_CONTEXT_MAX], - int input_fd, - char **ret_filename, - int *ret_node_fd, - int *ret_data_fd, - uint64_t *ret_size) { - - _cleanup_free_ char *fn = NULL, *tmp = NULL; - _cleanup_close_ int fd = -1; - uint64_t rlimit, max_size; - struct stat st; - uid_t uid; - int r; - - assert(context); - assert(ret_filename); - assert(ret_node_fd); - assert(ret_data_fd); - assert(ret_size); - - r = parse_uid(context[CONTEXT_UID], &uid); - if (r < 0) - return log_error_errno(r, "Failed to parse UID: %m"); - - r = safe_atou64(context[CONTEXT_RLIMIT], &rlimit); - if (r < 0) - return log_error_errno(r, "Failed to parse resource limit: %s", context[CONTEXT_RLIMIT]); - if (rlimit < page_size()) { - /* Is coredumping disabled? Then don't bother saving/processing the coredump. - * Anything below PAGE_SIZE cannot give a readable coredump (the kernel uses - * ELF_EXEC_PAGESIZE which is not easily accessible, but is usually the same as PAGE_SIZE. */ - log_info("Resource limits disable core dumping for process %s (%s).", - context[CONTEXT_PID], context[CONTEXT_COMM]); - return -EBADSLT; - } - - /* Never store more than the process configured, or than we actually shall keep or process */ - max_size = MIN(rlimit, MAX(arg_process_size_max, storage_size_max())); - - r = make_filename(context, &fn); - if (r < 0) - return log_error_errno(r, "Failed to determine coredump file name: %m"); - - mkdir_p_label("/var/lib/systemd/coredump", 0755); - - fd = open_tmpfile_linkable(fn, O_RDWR|O_CLOEXEC, &tmp); - if (fd < 0) - return log_error_errno(fd, "Failed to create temporary file for coredump %s: %m", fn); - - r = copy_bytes(input_fd, fd, max_size, false); - if (r < 0) { - log_error_errno(r, "Cannot store coredump of %s (%s): %m", context[CONTEXT_PID], context[CONTEXT_COMM]); - goto fail; - } else if (r == 1) - log_struct(LOG_INFO, - LOG_MESSAGE("Core file was truncated to %zu bytes.", max_size), - "SIZE_LIMIT=%zu", max_size, - LOG_MESSAGE_ID(SD_MESSAGE_TRUNCATED_CORE), - NULL); - - if (fstat(fd, &st) < 0) { - log_error_errno(errno, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp)); - goto fail; - } - - if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { - log_error_errno(errno, "Failed to seek on %s: %m", coredump_tmpfile_name(tmp)); - goto fail; - } - -#if defined(HAVE_XZ) || defined(HAVE_LZ4) - /* If we will remove the coredump anyway, do not compress. */ - if (arg_compress && !maybe_remove_external_coredump(NULL, st.st_size)) { - - _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; - _cleanup_close_ int fd_compressed = -1; - - fn_compressed = strappend(fn, COMPRESSED_EXT); - if (!fn_compressed) { - log_oom(); - goto uncompressed; - } - - fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed); - if (fd_compressed < 0) { - log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed); - goto uncompressed; - } - - r = compress_stream(fd, fd_compressed, -1); - if (r < 0) { - log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed)); - goto fail_compressed; - } - - r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid); - if (r < 0) - goto fail_compressed; - - /* OK, this worked, we can get rid of the uncompressed version now */ - if (tmp) - unlink_noerrno(tmp); - - *ret_filename = fn_compressed; /* compressed */ - *ret_node_fd = fd_compressed; /* compressed */ - *ret_data_fd = fd; /* uncompressed */ - *ret_size = (uint64_t) st.st_size; /* uncompressed */ - - fn_compressed = NULL; - fd = fd_compressed = -1; - - return 0; - - fail_compressed: - if (tmp_compressed) - (void) unlink(tmp_compressed); - } - -uncompressed: -#endif - - r = fix_permissions(fd, tmp, fn, context, uid); - if (r < 0) - goto fail; - - *ret_filename = fn; - *ret_data_fd = fd; - *ret_node_fd = -1; - *ret_size = (uint64_t) st.st_size; - - fn = NULL; - fd = -1; - - return 0; - -fail: - if (tmp) - (void) unlink(tmp); - return r; -} - -static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { - _cleanup_free_ char *field = NULL; - ssize_t n; - - assert(fd >= 0); - assert(ret); - assert(ret_size); - - if (lseek(fd, 0, SEEK_SET) == (off_t) -1) - return log_warning_errno(errno, "Failed to seek: %m"); - - field = malloc(9 + size); - if (!field) { - log_warning("Failed to allocate memory for coredump, coredump will not be stored."); - return -ENOMEM; - } - - memcpy(field, "COREDUMP=", 9); - - n = read(fd, field + 9, size); - 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; - } - - *ret = field; - *ret_size = size + 9; - - field = NULL; - - 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; - stream = safe_fclose(stream); - - if (errno > 0) - return -errno; - - *open_fds = buffer; - buffer = NULL; - - return 0; -} - -static int get_process_ns(pid_t pid, const char *namespace, ino_t *ns) { - const char *p; - struct stat stbuf; - _cleanup_close_ int proc_ns_dir_fd; - - p = procfs_file_alloca(pid, "ns"); - - proc_ns_dir_fd = open(p, O_DIRECTORY | O_CLOEXEC | O_RDONLY); - if (proc_ns_dir_fd < 0) - return -errno; - - if (fstatat(proc_ns_dir_fd, namespace, &stbuf, /* flags */0) < 0) - return -errno; - - *ns = stbuf.st_ino; - return 0; -} - -static int get_mount_namespace_leader(pid_t pid, pid_t *container_pid) { - pid_t cpid = pid, ppid = 0; - ino_t proc_mntns; - int r = 0; - - r = get_process_ns(pid, "mnt", &proc_mntns); - if (r < 0) - return r; - - for (;;) { - ino_t parent_mntns; - - r = get_process_ppid(cpid, &ppid); - if (r < 0) - return r; - - r = get_process_ns(ppid, "mnt", &parent_mntns); - if (r < 0) - return r; - - if (proc_mntns != parent_mntns) - break; - - if (ppid == 1) - return -ENOENT; - - cpid = ppid; - } - - *container_pid = ppid; - return 0; -} - -/* Returns 1 if the parent was found. - * Returns 0 if there is not a process we can call the pid's - * container parent (the pid's process isn't 'containerized'). - * Returns a negative number on errors. - */ -static int get_process_container_parent_cmdline(pid_t pid, char** cmdline) { - int r = 0; - pid_t container_pid; - const char *proc_root_path; - struct stat root_stat, proc_root_stat; - - /* To compare inodes of / and /proc/[pid]/root */ - if (stat("/", &root_stat) < 0) - return -errno; - - proc_root_path = procfs_file_alloca(pid, "root"); - if (stat(proc_root_path, &proc_root_stat) < 0) - return -errno; - - /* The process uses system root. */ - if (proc_root_stat.st_ino == root_stat.st_ino) { - *cmdline = NULL; - return 0; - } - - r = get_mount_namespace_leader(pid, &container_pid); - if (r < 0) - return r; - - return get_process_cmdline(container_pid, 0, false, cmdline); -} - -static int change_uid_gid(const char *context[]) { - uid_t uid; - gid_t gid; - int r; - - r = parse_uid(context[CONTEXT_UID], &uid); - if (r < 0) - return r; - - if (uid <= SYSTEM_UID_MAX) { - const char *user = "systemd-coredump"; - - r = get_user_creds(&user, &uid, &gid, NULL, NULL); - if (r < 0) { - log_warning_errno(r, "Cannot resolve %s user. Proceeding to dump core as root: %m", user); - uid = gid = 0; - } - } else { - r = parse_gid(context[CONTEXT_GID], &gid); - if (r < 0) - return r; - } - - return drop_privileges(uid, gid, 0); -} - -static int submit_coredump( - const char *context[_CONTEXT_MAX], - struct iovec *iovec, - size_t n_iovec_allocated, - size_t n_iovec, - int input_fd) { - - _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; - _cleanup_free_ char *core_message = NULL, *filename = NULL, *coredump_data = NULL; - uint64_t coredump_size = UINT64_MAX; - int r; - - assert(context); - assert(iovec); - assert(n_iovec_allocated >= n_iovec + 3); - assert(input_fd >= 0); - - /* Vacuum before we write anything again */ - (void) coredump_vacuum(-1, arg_keep_free, arg_max_use); - - /* Always stream the coredump to disk, if that's possible */ - r = save_external_coredump(context, input_fd, &filename, &coredump_node_fd, &coredump_fd, &coredump_size); - if (r < 0) - /* Skip whole core dumping part */ - goto log; - - /* If we don't want to keep the coredump on disk, remove it now, as later on we will lack the privileges for - * it. However, we keep the fd to it, so that we can still process it and log it. */ - r = maybe_remove_external_coredump(filename, coredump_size); - if (r < 0) - return r; - if (r == 0) { - const char *coredump_filename; - - coredump_filename = strjoina("COREDUMP_FILENAME=", filename); - IOVEC_SET_STRING(iovec[n_iovec++], coredump_filename); - } else if (arg_storage == COREDUMP_STORAGE_EXTERNAL) - log_info("The core will not be stored: size %zu is greater than %zu (the configured maximum)", - coredump_size, arg_external_size_max); - - /* Vacuum again, but exclude the coredump we just created */ - (void) coredump_vacuum(coredump_node_fd >= 0 ? coredump_node_fd : coredump_fd, arg_keep_free, arg_max_use); - - /* Now, let's drop privileges to become the user who owns the segfaulted process and allocate the coredump - * memory under 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. Let's also get rid of all - * capabilities, if we run as root, we won't need them anymore. */ - r = change_uid_gid(context); - if (r < 0) - return log_error_errno(r, "Failed to drop privileges: %m"); - -#ifdef HAVE_ELFUTILS - /* Try to get a strack trace if we can */ - if (coredump_size <= arg_process_size_max) { - _cleanup_free_ char *stacktrace = NULL; - - r = coredump_make_stack_trace(coredump_fd, context[CONTEXT_EXE], &stacktrace); - if (r >= 0) - core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], " (", context[CONTEXT_COMM], ") of user ", context[CONTEXT_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_errno(r, "Failed to generate stack trace: %m"); - } else - log_debug("Not generating stack trace: core size %zu is greater than %zu (the configured maximum)", - coredump_size, arg_process_size_max); - - if (!core_message) -#endif -log: - core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], " (", context[CONTEXT_COMM], ") of user ", context[CONTEXT_UID], " dumped core.", NULL); - if (core_message) - IOVEC_SET_STRING(iovec[n_iovec++], core_message); - - /* Optionally store the entire coredump in the journal */ - if (arg_storage == COREDUMP_STORAGE_JOURNAL) { - if (coredump_size <= arg_journal_size_max) { - size_t sz = 0; - - /* Store the coredump itself in the journal */ - - r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); - if (r >= 0) { - iovec[n_iovec].iov_base = coredump_data; - iovec[n_iovec].iov_len = sz; - n_iovec++; - } else - log_warning_errno(r, "Failed to attach the core to the journal entry: %m"); - } else - log_info("The core will not be stored: size %zu is greater than %zu (the configured maximum)", - coredump_size, arg_journal_size_max); - } - - assert(n_iovec <= n_iovec_allocated); - - r = sd_journal_sendv(iovec, n_iovec); - if (r < 0) - return log_error_errno(r, "Failed to log coredump: %m"); - - return 0; -} - -static void map_context_fields(const struct iovec *iovec, const char *context[]) { - - static const char * const context_field_names[_CONTEXT_MAX] = { - [CONTEXT_PID] = "COREDUMP_PID=", - [CONTEXT_UID] = "COREDUMP_UID=", - [CONTEXT_GID] = "COREDUMP_GID=", - [CONTEXT_SIGNAL] = "COREDUMP_SIGNAL=", - [CONTEXT_TIMESTAMP] = "COREDUMP_TIMESTAMP=", - [CONTEXT_COMM] = "COREDUMP_COMM=", - [CONTEXT_EXE] = "COREDUMP_EXE=", - [CONTEXT_RLIMIT] = "COREDUMP_RLIMIT=", - }; - - unsigned i; - - assert(iovec); - assert(context); - - for (i = 0; i < _CONTEXT_MAX; i++) { - size_t l; - - l = strlen(context_field_names[i]); - if (iovec->iov_len < l) - continue; - - if (memcmp(iovec->iov_base, context_field_names[i], l) != 0) - continue; - - /* Note that these strings are NUL terminated, because we made sure that a trailing NUL byte is in the - * buffer, though not included in the iov_len count. (see below) */ - context[i] = (char*) iovec->iov_base + l; - break; - } -} - -static int process_socket(int fd) { - _cleanup_close_ int coredump_fd = -1; - struct iovec *iovec = NULL; - size_t n_iovec = 0, n_iovec_allocated = 0, i; - const char *context[_CONTEXT_MAX] = {}; - int r; - - assert(fd >= 0); - - log_set_target(LOG_TARGET_AUTO); - log_parse_environment(); - log_open(); - - for (;;) { - union { - struct cmsghdr cmsghdr; - uint8_t buf[CMSG_SPACE(sizeof(int))]; - } control = {}; - struct msghdr mh = { - .msg_control = &control, - .msg_controllen = sizeof(control), - .msg_iovlen = 1, - }; - ssize_t n; - ssize_t l; - - if (!GREEDY_REALLOC(iovec, n_iovec_allocated, n_iovec + 3)) { - r = log_oom(); - goto finish; - } - - l = next_datagram_size_fd(fd); - if (l < 0) { - r = log_error_errno(l, "Failed to determine datagram size to read: %m"); - goto finish; - } - - assert(l >= 0); - - iovec[n_iovec].iov_len = l; - iovec[n_iovec].iov_base = malloc(l + 1); - if (!iovec[n_iovec].iov_base) { - r = log_oom(); - goto finish; - } - - mh.msg_iov = iovec + n_iovec; - - n = recvmsg(fd, &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); - if (n < 0) { - free(iovec[n_iovec].iov_base); - r = log_error_errno(errno, "Failed to receive datagram: %m"); - goto finish; - } - - if (n == 0) { - struct cmsghdr *cmsg, *found = NULL; - /* The final zero-length datagram carries the file descriptor and tells us that we're done. */ - - free(iovec[n_iovec].iov_base); - - CMSG_FOREACH(cmsg, &mh) { - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_RIGHTS && - cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { - assert(!found); - found = cmsg; - } - } - - if (!found) { - log_error("Coredump file descriptor missing."); - r = -EBADMSG; - goto finish; - } - - assert(coredump_fd < 0); - coredump_fd = *(int*) CMSG_DATA(found); - break; - } - - /* Add trailing NUL byte, in case these are strings */ - ((char*) iovec[n_iovec].iov_base)[n] = 0; - iovec[n_iovec].iov_len = (size_t) n; - - cmsg_close_all(&mh); - map_context_fields(iovec + n_iovec, context); - n_iovec++; - } - - if (!GREEDY_REALLOC(iovec, n_iovec_allocated, n_iovec + 3)) { - r = log_oom(); - goto finish; - } - - /* Make sure we got all data we really need */ - assert(context[CONTEXT_PID]); - assert(context[CONTEXT_UID]); - assert(context[CONTEXT_GID]); - assert(context[CONTEXT_SIGNAL]); - assert(context[CONTEXT_TIMESTAMP]); - assert(context[CONTEXT_RLIMIT]); - assert(context[CONTEXT_COMM]); - assert(coredump_fd >= 0); - - r = submit_coredump(context, iovec, n_iovec_allocated, n_iovec, coredump_fd); - -finish: - for (i = 0; i < n_iovec; i++) - free(iovec[i].iov_base); - free(iovec); - - return r; -} - -static int send_iovec(const struct iovec iovec[], size_t n_iovec, int input_fd) { - - static const union sockaddr_union sa = { - .un.sun_family = AF_UNIX, - .un.sun_path = "/run/systemd/coredump", - }; - _cleanup_close_ int fd = -1; - size_t i; - int r; - - assert(iovec || n_iovec <= 0); - assert(input_fd >= 0); - - fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0); - if (fd < 0) - return log_error_errno(errno, "Failed to create coredump socket: %m"); - - if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) - return log_error_errno(errno, "Failed to connect to coredump service: %m"); - - for (i = 0; i < n_iovec; i++) { - struct msghdr mh = { - .msg_iov = (struct iovec*) iovec + i, - .msg_iovlen = 1, - }; - struct iovec copy[2]; - - for (;;) { - if (sendmsg(fd, &mh, MSG_NOSIGNAL) >= 0) - break; - - if (errno == EMSGSIZE && mh.msg_iov[0].iov_len > 0) { - /* This field didn't fit? That's a pity. Given that this is just metadata, - * let's truncate the field at half, and try again. We append three dots, in - * order to show that this is truncated. */ - - if (mh.msg_iov != copy) { - /* We don't want to modify the caller's iovec, hence let's create our - * own array, consisting of two new iovecs, where the first is a - * (truncated) copy of what we want to send, and the second one - * contains the trailing dots. */ - copy[0] = iovec[i]; - copy[1] = (struct iovec) { - .iov_base = (char[]) { '.', '.', '.' }, - .iov_len = 3, - }; - - mh.msg_iov = copy; - mh.msg_iovlen = 2; - } - - copy[0].iov_len /= 2; /* halve it, and try again */ - continue; - } - - return log_error_errno(errno, "Failed to send coredump datagram: %m"); - } - } - - r = send_one_fd(fd, input_fd, 0); - if (r < 0) - return log_error_errno(r, "Failed to send coredump fd: %m"); - - return 0; -} - -static int process_special_crash(const char *context[], int input_fd) { - _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; - _cleanup_free_ char *filename = NULL; - uint64_t coredump_size; - int r; - - assert(context); - assert(input_fd >= 0); - - /* If we are pid1 or journald, we cut things short, don't write to the journal, but still create a coredump. */ - - if (arg_storage != COREDUMP_STORAGE_NONE) - arg_storage = COREDUMP_STORAGE_EXTERNAL; - - r = save_external_coredump(context, input_fd, &filename, &coredump_node_fd, &coredump_fd, &coredump_size); - if (r < 0) - return r; - - r = maybe_remove_external_coredump(filename, coredump_size); - if (r < 0) - return r; - - log_notice("Detected coredump of the journal daemon or PID 1, diverted to %s.", filename); - - return 0; -} - -static int process_kernel(int argc, char* argv[]) { - - /* 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_user_unit = NULL, *core_slice = NULL, *core_timestamp = NULL, *core_rlimit = NULL; - - /* The larger ones we allocate on the heap */ - _cleanup_free_ char - *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, - *core_proc_mountinfo = NULL, *core_container_cmdline = NULL; - - _cleanup_free_ char *exe = NULL, *comm = NULL; - const char *context[_CONTEXT_MAX]; - bool proc_self_root_is_slash; - struct iovec iovec[27]; - size_t n_iovec = 0; - uid_t owner_uid; - const char *p; - pid_t pid; - char *t; - int r; - - if (argc < CONTEXT_COMM + 1) { - log_error("Not enough arguments passed from kernel (%i, expected %i).", argc - 1, CONTEXT_COMM + 1 - 1); - return -EINVAL; - } - - r = parse_pid(argv[CONTEXT_PID + 1], &pid); - if (r < 0) - return log_error_errno(r, "Failed to parse PID."); - - r = get_process_comm(pid, &comm); - if (r < 0) { - log_warning_errno(r, "Failed to get COMM, falling back to the command line: %m"); - comm = strv_join(argv + CONTEXT_COMM + 1, " "); - if (!comm) - return log_oom(); - } - - r = get_process_exe(pid, &exe); - if (r < 0) - log_warning_errno(r, "Failed to get EXE, ignoring: %m"); - - context[CONTEXT_PID] = argv[CONTEXT_PID + 1]; - context[CONTEXT_UID] = argv[CONTEXT_UID + 1]; - context[CONTEXT_GID] = argv[CONTEXT_GID + 1]; - context[CONTEXT_SIGNAL] = argv[CONTEXT_SIGNAL + 1]; - context[CONTEXT_TIMESTAMP] = argv[CONTEXT_TIMESTAMP + 1]; - context[CONTEXT_RLIMIT] = argv[CONTEXT_RLIMIT + 1]; - context[CONTEXT_COMM] = comm; - context[CONTEXT_EXE] = exe; - - if (cg_pid_get_unit(pid, &t) >= 0) { - - /* If this is PID 1 disable coredump collection, we'll unlikely be able to process it later on. */ - if (streq(t, SPECIAL_INIT_SCOPE)) { - log_notice("Due to PID 1 having crashed coredump collection will now be turned off."); - (void) write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", 0); - } - - /* Let's avoid dead-locks when processing journald and init crashes, as socket activation and logging - * are unlikely to work then. */ - if (STR_IN_SET(t, SPECIAL_JOURNALD_SERVICE, SPECIAL_INIT_SCOPE)) { - free(t); - return process_special_crash(context, STDIN_FILENO); - } - - core_unit = strjoina("COREDUMP_UNIT=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_unit); - } - - /* OK, now we know it's not the journal, hence we can make use of it now. */ - log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); - log_open(); - - if (cg_pid_get_user_unit(pid, &t) >= 0) { - core_user_unit = strjoina("COREDUMP_USER_UNIT=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_user_unit); - } - - core_pid = strjoina("COREDUMP_PID=", context[CONTEXT_PID]); - IOVEC_SET_STRING(iovec[n_iovec++], core_pid); - - core_uid = strjoina("COREDUMP_UID=", context[CONTEXT_UID]); - IOVEC_SET_STRING(iovec[n_iovec++], core_uid); - - core_gid = strjoina("COREDUMP_GID=", context[CONTEXT_GID]); - IOVEC_SET_STRING(iovec[n_iovec++], core_gid); - - core_signal = strjoina("COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL]); - IOVEC_SET_STRING(iovec[n_iovec++], core_signal); - - core_rlimit = strjoina("COREDUMP_RLIMIT=", context[CONTEXT_RLIMIT]); - IOVEC_SET_STRING(iovec[n_iovec++], core_rlimit); - - if (sd_pid_get_session(pid, &t) >= 0) { - core_session = strjoina("COREDUMP_SESSION=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_session); - } - - if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { - r = asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); - if (r > 0) - IOVEC_SET_STRING(iovec[n_iovec++], core_owner_uid); - } - - if (sd_pid_get_slice(pid, &t) >= 0) { - core_slice = strjoina("COREDUMP_SLICE=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_slice); - } - - if (comm) { - core_comm = strjoina("COREDUMP_COMM=", comm); - IOVEC_SET_STRING(iovec[n_iovec++], core_comm); - } - - if (exe) { - core_exe = strjoina("COREDUMP_EXE=", exe); - IOVEC_SET_STRING(iovec[n_iovec++], core_exe); - } - - if (get_process_cmdline(pid, 0, false, &t) >= 0) { - core_cmdline = strjoina("COREDUMP_CMDLINE=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_cmdline); - } - - if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { - core_cgroup = strjoina("COREDUMP_CGROUP=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], 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[n_iovec++], 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[n_iovec++], 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[n_iovec++], 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[n_iovec++], 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[n_iovec++], core_proc_cgroup); - } - - p = procfs_file_alloca(pid, "mountinfo"); - if (read_full_file(p, &t, NULL) >=0) { - core_proc_mountinfo = strappend("COREDUMP_PROC_MOUNTINFO=", t); - free(t); - - if (core_proc_mountinfo) - IOVEC_SET_STRING(iovec[n_iovec++], core_proc_mountinfo); - } - - if (get_process_cwd(pid, &t) >= 0) { - core_cwd = strjoina("COREDUMP_CWD=", t); - free(t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_cwd); - } - - if (get_process_root(pid, &t) >= 0) { - core_root = strjoina("COREDUMP_ROOT=", t); - - IOVEC_SET_STRING(iovec[n_iovec++], core_root); - - /* If the process' root is "/", then there is a chance it has - * mounted own root and hence being containerized. */ - proc_self_root_is_slash = strcmp(t, "/") == 0; - free(t); - if (proc_self_root_is_slash && get_process_container_parent_cmdline(pid, &t) > 0) { - core_container_cmdline = strappend("COREDUMP_CONTAINER_CMDLINE=", t); - free(t); - - if (core_container_cmdline) - IOVEC_SET_STRING(iovec[n_iovec++], core_container_cmdline); - } - } - - if (get_process_environ(pid, &t) >= 0) { - core_environ = strappend("COREDUMP_ENVIRON=", t); - free(t); - - if (core_environ) - IOVEC_SET_STRING(iovec[n_iovec++], core_environ); - } - - core_timestamp = strjoina("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000"); - IOVEC_SET_STRING(iovec[n_iovec++], core_timestamp); - - IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); - - assert_cc(2 == LOG_CRIT); - IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2"); - - assert(n_iovec <= ELEMENTSOF(iovec)); - - return send_iovec(iovec, n_iovec, STDIN_FILENO); -} - -int main(int argc, char *argv[]) { - int r; - - /* First, log to a safe place, since we don't know what crashed and it might be journald which we'd rather not - * log to then. */ - - log_set_target(LOG_TARGET_KMSG); - log_open(); - - /* Make sure we never enter a loop */ - (void) prctl(PR_SET_DUMPABLE, 0); - - /* Ignore all parse errors */ - (void) parse_config(); - - log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); - log_debug("Selected compression %s.", yes_no(arg_compress)); - - r = sd_listen_fds(false); - if (r < 0) { - log_error_errno(r, "Failed to determine number of file descriptor: %m"); - goto finish; - } - - /* If we got an fd passed, we are running in coredumpd mode. Otherwise we are invoked from the kernel as - * coredump handler */ - if (r == 0) - r = process_kernel(argc, argv); - else if (r == 1) - r = process_socket(SD_LISTEN_FDS_START); - else { - log_error("Received unexpected number of file descriptors."); - r = -EINVAL; - } - -finish: - return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; -} |