Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 367 insertions, 0 deletions

diff --git a/src/pstore/pstore.c b/src/pstore/pstore.c
new file mode 100644
index 0000000..8f32a0a
--- /dev/null
+++ b/src/pstore/pstore.c
@@ -0,0 +1,367 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/* Copyright © 2019 Oracle and/or its affiliates. */
+
+/* Generally speaking, the pstore contains a small number of files
+ * that in turn contain a small amount of data.  */
+#include <errno.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <sys/prctl.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+
+#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 "dirent-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "iovec-util.h"
+#include "journal-importer.h"
+#include "log.h"
+#include "macro.h"
+#include "main-func.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "socket-util.h"
+#include "special.h"
+#include "sort-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+
+/* Command line argument handling */
+typedef enum PStoreStorage {
+        PSTORE_STORAGE_NONE,
+        PSTORE_STORAGE_EXTERNAL,
+        PSTORE_STORAGE_JOURNAL,
+        _PSTORE_STORAGE_MAX,
+        _PSTORE_STORAGE_INVALID = -EINVAL,
+} PStoreStorage;
+
+static const char* const pstore_storage_table[_PSTORE_STORAGE_MAX] = {
+        [PSTORE_STORAGE_NONE] = "none",
+        [PSTORE_STORAGE_EXTERNAL] = "external",
+        [PSTORE_STORAGE_JOURNAL] = "journal",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP(pstore_storage, PStoreStorage);
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_pstore_storage, pstore_storage, PStoreStorage, "Failed to parse storage setting");
+
+static PStoreStorage arg_storage = PSTORE_STORAGE_EXTERNAL;
+
+static bool arg_unlink = true;
+static const char *arg_sourcedir = "/sys/fs/pstore";
+static const char *arg_archivedir = "/var/lib/systemd/pstore";
+
+static int parse_config(void) {
+        static const ConfigTableItem items[] = {
+                { "PStore", "Unlink",  config_parse_bool,           0, &arg_unlink },
+                { "PStore", "Storage", config_parse_pstore_storage, 0, &arg_storage },
+                {}
+        };
+
+        return config_parse_config_file("pstore.conf", "PStore\0",
+                                        config_item_table_lookup, items,
+                                        CONFIG_PARSE_WARN, NULL);
+}
+
+/* File list handling - PStoreEntry is the struct and
+ * and PStoreEntry is the type that contains all info
+ * about a pstore entry.  */
+typedef struct PStoreEntry {
+        struct dirent dirent;
+        bool is_binary;
+        bool handled;
+        char *content;
+        size_t content_size;
+} PStoreEntry;
+
+typedef struct PStoreList {
+        PStoreEntry *entries;
+        size_t n_entries;
+} PStoreList;
+
+static void pstore_entries_reset(PStoreList *list) {
+        for (size_t i = 0; i < list->n_entries; i++)
+                free(list->entries[i].content);
+        free(list->entries);
+        list->n_entries = 0;
+}
+
+static int compare_pstore_entries(const PStoreEntry *a, const PStoreEntry *b) {
+        return strcmp(a->dirent.d_name, b->dirent.d_name);
+}
+
+static int move_file(PStoreEntry *pe, const char *subdir1, const char *subdir2) {
+        _cleanup_free_ char *ifd_path = NULL, *ofd_path = NULL;
+        _cleanup_free_ void *field = NULL;
+        const char *suffix, *message;
+        struct iovec iovec[2];
+        int n_iovec = 0, r;
+
+        if (pe->handled)
+                return 0;
+
+        ifd_path = path_join(arg_sourcedir, pe->dirent.d_name);
+        if (!ifd_path)
+                return log_oom();
+
+        ofd_path = path_join(arg_archivedir, subdir1, subdir2, pe->dirent.d_name);
+        if (!ofd_path)
+                return log_oom();
+
+        /* Always log to the journal */
+        suffix = arg_storage == PSTORE_STORAGE_EXTERNAL ? strjoina(" moved to ", ofd_path) : (char *)".";
+        message = strjoina("MESSAGE=PStore ", pe->dirent.d_name, suffix);
+        iovec[n_iovec++] = IOVEC_MAKE_STRING(message);
+
+        if (pe->content_size > 0) {
+                size_t field_size;
+
+                field_size = strlen("FILE=") + pe->content_size;
+                field = malloc(field_size);
+                if (!field)
+                        return log_oom();
+                memcpy(stpcpy(field, "FILE="), pe->content, pe->content_size);
+                iovec[n_iovec++] = IOVEC_MAKE(field, field_size);
+        }
+
+        r = sd_journal_sendv(iovec, n_iovec);
+        if (r < 0)
+                return log_error_errno(r, "Failed to log pstore entry: %m");
+
+        if (arg_storage == PSTORE_STORAGE_EXTERNAL) {
+                /* Move file from pstore to external storage */
+                r = mkdir_parents(ofd_path, 0755);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to create directory %s: %m", ofd_path);
+                r = copy_file_atomic(ifd_path, ofd_path, 0600, COPY_REPLACE);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to copy_file_atomic: %s to %s", ifd_path, ofd_path);
+        }
+
+        /* If file copied properly, remove it from pstore */
+        if (arg_unlink)
+                (void) unlink(ifd_path);
+
+        pe->handled = true;
+
+        return 0;
+}
+
+static int append_dmesg(PStoreEntry *pe, const char *subdir1, const char *subdir2) {
+        /* Append dmesg chunk to end, create if needed */
+        _cleanup_free_ char *ofd_path = NULL;
+        _cleanup_close_ int ofd = -EBADF;
+        ssize_t wr;
+
+        assert(pe);
+
+        if (arg_storage != PSTORE_STORAGE_EXTERNAL)
+                return 0;
+
+        if (pe->content_size == 0)
+                return 0;
+
+        ofd_path = path_join(arg_archivedir, subdir1, subdir2, "dmesg.txt");
+        if (!ofd_path)
+                return log_oom();
+
+        ofd = open(ofd_path, O_CREAT|O_NOFOLLOW|O_NOCTTY|O_CLOEXEC|O_APPEND|O_WRONLY, 0640);
+        if (ofd < 0)
+                return log_error_errno(ofd, "Failed to open file %s: %m", ofd_path);
+        wr = write(ofd, pe->content, pe->content_size);
+        if (wr < 0)
+                return log_error_errno(errno, "Failed to store dmesg to %s: %m", ofd_path);
+        if ((size_t)wr != pe->content_size)
+                return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to store dmesg to %s. %zu bytes are lost.", ofd_path, pe->content_size - wr);
+
+        return 0;
+}
+
+static int process_dmesg_files(PStoreList *list) {
+        /* Move files, reconstruct dmesg.txt */
+        _cleanup_free_ char *erst_subdir = NULL;
+        unsigned long long last_record_id = 0;
+
+        /* When dmesg is written into pstore, it is done so in small chunks, whatever the exchange buffer
+         * size is with the underlying pstore backend (ie. EFI may be ~2KiB), which means an example
+         * pstore with approximately 64KB of storage may have up to roughly 32 dmesg files, some likely
+         * related.
+         *
+         * Here we look at the dmesg filename and try to discern if files are part of a related group,
+         * meaning the same original dmesg.
+         *
+         * The dmesg- filename contains the backend-type and the Common Platform Error Record, CPER,
+         * record id, a 64-bit number.
+         *
+         * Files are processed in reverse lexigraphical order so as to properly reconstruct original dmesg. */
+
+        for (size_t n = list->n_entries; n > 0; n--) {
+                PStoreEntry *pe;
+                char *p;
+
+                pe = &list->entries[n-1];
+
+                if (pe->handled)
+                        continue;
+                if (endswith(pe->dirent.d_name, ".enc.z")) /* indicates a problem */
+                        continue;
+                if (!startswith(pe->dirent.d_name, "dmesg-"))
+                        continue;
+
+                /* The linux kernel changed the prefix from dmesg-efi- to dmesg-efi_pstore-
+                 * so now we have to handle both cases. */
+                if ((p = STARTSWITH_SET(pe->dirent.d_name, "dmesg-efi-", "dmesg-efi_pstore-"))) {
+                        /* For the EFI backend, the 3 least significant digits of record id encodes a
+                         * "count" number, the next 2 least significant digits for the dmesg part
+                         * (chunk) number, and the remaining digits as the timestamp.  See
+                         * linux/drivers/firmware/efi/efi-pstore.c in efi_pstore_write(). */
+                        _cleanup_free_ char *subdir1 = NULL, *subdir2 = NULL;
+                        size_t plen = strlen(p);
+
+                        if (plen < 6)
+                                continue;
+
+                        /* Extract base record id */
+                        subdir1 = strndup(p, plen - 5);
+                        if (!subdir1)
+                                return log_oom();
+                        /* Extract "count" field */
+                        subdir2 = strndup(p + plen - 3, 3);
+                        if (!subdir2)
+                                return log_oom();
+
+                        /* Now move file from pstore to archive storage */
+                        (void) move_file(pe, subdir1, subdir2);
+
+                        /* Append to the dmesg */
+                        (void) append_dmesg(pe, subdir1, subdir2);
+                } else if ((p = startswith(pe->dirent.d_name, "dmesg-erst-"))) {
+                        /* For the ERST backend, the record is a monotonically increasing number, seeded as
+                         * a timestamp. See linux/drivers/acpi/apei/erst.c in erst_writer(). */
+                        unsigned long long record_id;
+
+                        if (safe_atollu_full(p, 10, &record_id) < 0)
+                                continue;
+                        if (last_record_id - 1 != record_id)
+                                /* A discontinuity in the number has been detected, this current record id
+                                 * will become the directory name for all pieces of the dmesg in this
+                                 * series. */
+                                if (free_and_strdup(&erst_subdir, p) < 0)
+                                        return log_oom();
+
+                        /* Now move file from pstore to archive storage */
+                        (void) move_file(pe, erst_subdir, NULL);
+
+                        /* Append to the dmesg */
+                        (void) append_dmesg(pe, erst_subdir, NULL);
+
+                        /* Update, but keep erst_subdir for next file */
+                        last_record_id = record_id;
+                } else
+                        log_debug("Unknown backend, ignoring \"%s\".", pe->dirent.d_name);
+        }
+        return 0;
+}
+
+static int list_files(PStoreList *list, const char *sourcepath) {
+        _cleanup_closedir_ DIR *dirp = NULL;
+        int r;
+
+        dirp = opendir(sourcepath);
+        if (!dirp)
+                return log_error_errno(errno, "Failed to opendir %s: %m", sourcepath);
+
+        FOREACH_DIRENT(de, dirp, return log_error_errno(errno, "Failed to iterate through %s: %m", sourcepath)) {
+                _cleanup_free_ char *ifd_path = NULL;
+
+                ifd_path = path_join(sourcepath, de->d_name);
+                if (!ifd_path)
+                        return log_oom();
+
+                _cleanup_free_ char *buf = NULL;
+                size_t buf_size;
+
+                /* Now read contents of pstore file */
+                r = read_full_virtual_file(ifd_path, &buf, &buf_size);
+                if (r < 0) {
+                        log_warning_errno(r, "Failed to read file %s, skipping: %m", ifd_path);
+                        continue;
+                }
+
+                if (!GREEDY_REALLOC(list->entries, list->n_entries + 1))
+                        return log_oom();
+
+                list->entries[list->n_entries++] = (PStoreEntry) {
+                        .dirent = *de,
+                        .content = TAKE_PTR(buf),
+                        .content_size = buf_size,
+                        .is_binary = true,
+                        .handled = false,
+                };
+        }
+
+        return 0;
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_(pstore_entries_reset) PStoreList list = {};
+        int r;
+
+        log_setup();
+
+        if (argc == 3) {
+                arg_sourcedir = argv[1];
+                arg_archivedir = argv[2];
+        } else if (argc > 1)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "This program takes zero or two arguments.");
+
+        /* Ignore all parse errors */
+        (void) parse_config();
+
+        log_debug("Selected storage: %s.", pstore_storage_to_string(arg_storage));
+        log_debug("Selected unlink: %s.", yes_no(arg_unlink));
+
+        if (arg_storage == PSTORE_STORAGE_NONE)
+                /* Do nothing, intentionally, leaving pstore untouched */
+                return 0;
+
+        /* Obtain list of files in pstore */
+        r = list_files(&list, arg_sourcedir);
+        if (r < 0)
+                return r;
+
+        /* Handle each pstore file */
+        /* Sort files lexicographically ascending, generally needed by all */
+        typesafe_qsort(list.entries, list.n_entries, compare_pstore_entries);
+
+        /* Process known file types */
+        (void) process_dmesg_files(&list);
+
+        /* Move left over files out of pstore */
+        for (size_t n = 0; n < list.n_entries; n++)
+                (void) move_file(&list.entries[n], NULL, NULL);
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);