SoW-2019-0002: Dynamic Snapshot

[lttng-tools.git] / src / bin / lttng-crash / lttng-crash.c

diff --git a/src/bin/lttng-crash/lttng-crash.c b/src/bin/lttng-crash/lttng-crash.c
index 65fca36ae264c2e25f7d0437840a4a8f194f67b7..98c52c59dcd835a2c48cde3def2543d025f13132 100644 (file)
--- a/src/bin/lttng-crash/lttng-crash.c
+++ b/src/bin/lttng-crash/lttng-crash.c
@@ -2,18 +2,8 @@
  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
  * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <getopt.h>
@@ -61,6 +51,14 @@
                0xF1 ^ 0xFF, 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF,     \
        }
 
+static const char *help_msg =
+#ifdef LTTNG_EMBED_HELP
+#include <lttng-crash.1.h>
+#else
+NULL
+#endif
+;
+
 /*
  * Non-static to ensure the compiler does not optimize away the xor.
  */
@@ -182,9 +180,9 @@ struct lttng_crash_layout {
 };
 
 /* Variables */
-static char *progname,
-       *opt_viewer_path = NULL,
-       *opt_output_path = NULL;
+static const char *progname;
+static char *opt_viewer_path = NULL;
+static char *opt_output_path = NULL;
 
 static char *input_path;
 
@@ -207,10 +205,10 @@ static struct option long_options[] = {
 
 static void usage(void)
 {
-       int ret = utils_show_man_page(1, "lttng-crash");
+       int ret = utils_show_help(1, "lttng-crash", help_msg);
 
        if (ret) {
-               ERR("Cannot view man page lttng-crash(1)");
+               ERR("Cannot show --help for `lttng-crash`");
                perror("exec");
                exit(EXIT_FAILURE);
        }
@@ -219,9 +217,10 @@ static void usage(void)
 static void version(FILE *ofp)
 {
        fprintf(ofp, "%s (LTTng Crash Trace Viewer) " VERSION " - " VERSION_NAME
-"%s\n",
+"%s%s\n",
                        progname,
-                       GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION);
+                       GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION,
+                       EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME);
 }
 
 /*
@@ -297,7 +296,7 @@ static int parse_args(int argc, char **argv)
        }
 
        if (!opt_viewer_path) {
-               opt_viewer_path = DEFAULT_VIEWER;
+               opt_viewer_path = (char *) DEFAULT_VIEWER;
        }
 
        /* No leftovers, or more than one input path, print usage and quit */
@@ -490,7 +489,8 @@ int check_magic(const uint8_t *magic)
 }
 
 static
-int get_crash_layout(struct lttng_crash_layout *layout, int fd)
+int get_crash_layout(struct lttng_crash_layout *layout, int fd,
+               const char *input_file)
 {
        char *map;
        int ret = 0, unmapret;
@@ -501,7 +501,21 @@ int get_crash_layout(struct lttng_crash_layout *layout, int fd)
        const struct crash_abi_unknown *abi;
        uint16_t endian;
        enum lttng_crash_type layout_type;
+       struct stat stat;
 
+       ret = fstat(fd, &stat);
+       if (ret < 0) {
+               PERROR("Failed to fstat '%s'", input_file);
+               return -1;
+       }
+       if (stat.st_size < RB_CRASH_DUMP_ABI_LEN) {
+               ERR("File '%s' truncated: file length of %" PRIi64
+                               " bytes does not meet the minimal expected "
+                               "length of %d bytes",
+                               input_file, (int64_t) stat.st_size,
+                               RB_CRASH_DUMP_ABI_LEN);
+               return -1;
+       }
        map = mmap(NULL, RB_CRASH_DUMP_ABI_LEN, PROT_READ, MAP_PRIVATE,
                fd, 0);
        if (map == MAP_FAILED) {
@@ -830,7 +844,7 @@ int extract_file(int output_dir_fd, const char *output_file,
        }
 
        /* Query the crash ABI layout */
-       ret = get_crash_layout(&layout, fd_src);
+       ret = get_crash_layout(&layout, fd_src, input_file);
        if (ret) {
                goto close_src;
        }
@@ -1079,7 +1093,7 @@ int delete_dir_recursive(const char *path)
        if (!dir) {
                PERROR("Cannot open '%s' path", path);
                ret = -errno;
-               goto end;
+               goto end_no_closedir;
        }
 
        path_len = strlen(path);
@@ -1137,7 +1151,7 @@ int delete_dir_recursive(const char *path)
                        ret = delete_dir_recursive(subpath);
                        free(subpath);
                        if (ret) {
-                               /* Error occured, abort traversal. */
+                               /* Error occurred, abort traversal. */
                                goto end;
                        }
                } else if (S_ISREG(st.st_mode)) {
@@ -1162,6 +1176,7 @@ end:
        if (closeret) {
                PERROR("closedir");
        }
+end_no_closedir:
        return ret;
 }