grr... src/Hooks/abrt_hook_ccpp.cpp -> abrt-hook-ccpp.cpp

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 0 insertions, 368 deletions

diff --git a/src/Hooks/abrt_hook_ccpp.cpp b/src/Hooks/abrt_hook_ccpp.cpp
deleted file mode 100644
index e417743..0000000
--- a/src/Hooks/abrt_hook_ccpp.cpp
+++ /dev/null
@@ -1,368 +0,0 @@
-/*
-    abrt_hook_ccpp.cpp - the hook for C/C++ crashing program
-
-    Copyright (C) 2009	Zdenek Prikryl (zprikryl@redhat.com)
-    Copyright (C) 2009	RedHat inc.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    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 "abrtlib.h"
-#include "hooklib.h"
-#include "DebugDump.h"
-#include "ABRTException.h"
-#include <syslog.h>
-#include <sys/statvfs.h>
-
-#define FILENAME_EXECUTABLE     "executable"
-#define FILENAME_COREDUMP       "coredump"
-
-using namespace std;
-
-static char* malloc_readlink(const char *linkname)
-{
-    char buf[PATH_MAX + 1];
-    int len;
-
-    len = readlink(linkname, buf, sizeof(buf)-1);
-    if (len >= 0)
-    {
-        buf[len] = '\0';
-        return xstrdup(buf);
-    }
-    return NULL;
-}
-
-static char* get_executable(pid_t pid)
-{
-    char buf[sizeof("/proc/%lu/exe") + sizeof(long)*3];
-
-    sprintf(buf, "/proc/%lu/exe", (long)pid);
-    return malloc_readlink(buf);
-}
-
-static char* get_cwd(pid_t pid)
-{
-    char buf[sizeof("/proc/%lu/cwd") + sizeof(long)*3];
-
-    sprintf(buf, "/proc/%lu/cwd", (long)pid);
-    return malloc_readlink(buf);
-}
-
-int main(int argc, char** argv)
-{
-    int fd;
-    struct stat sb;
-
-    if (argc < 5)
-    {
-        const char* program_name = argv[0];
-        error_msg_and_die("Usage: %s: DUMPDIR PID SIGNO UID CORE_SIZE_LIMIT", program_name);
-    }
-    openlog("abrt", 0, LOG_PID | LOG_DAEMON);
-    logmode = LOGMODE_SYSLOG;
-
-    errno = 0;
-    const char* dddir = argv[1];
-    pid_t pid = xatoi_u(argv[2]);
-    const char* signal_str = argv[3];
-    int signal_no = xatoi_u(argv[3]);
-    uid_t uid = xatoi_u(argv[4]);
-    off_t ulimit_c = strtoull(argv[5], NULL, 10);
-    off_t core_size = 0;
-
-    if (errno || pid <= 0 || ulimit_c < 0)
-    {
-        error_msg_and_die("pid '%s' or limit '%s' is bogus", argv[2], argv[5]);
-    }
-    if (signal_no != SIGQUIT
-     && signal_no != SIGILL
-     && signal_no != SIGABRT
-     && signal_no != SIGFPE
-     && signal_no != SIGSEGV
-    ) {
-        /* not an error, exit silently */
-        return 0;
-    }
-
-
-    char *user_pwd = get_cwd(pid); /* may be NULL on error */
-    int core_fd = STDIN_FILENO;
-
-    if (!daemon_is_ok())
-    {
-        /* not an error, exit with exitcode 0 */
-        log("abrt daemon is not running. If it crashed, "
-            "/proc/sys/kernel/core_pattern contains a stale value, "
-            "consider resetting it to 'core'"
-        );
-        goto create_user_core;
-    }
-
-    try
-    {
-        char* executable = get_executable(pid);
-        if (executable == NULL)
-        {
-            error_msg_and_die("can't read /proc/%lu/exe link", (long)pid);
-        }
-        if (strstr(executable, "/abrt-hook-ccpp"))
-        {
-            error_msg_and_die("pid %lu is '%s', not dumping it to avoid recursion",
-                            (long)pid, executable);
-        }
-
-        /* Parse abrt.conf and plugins/CCpp.conf */
-        unsigned setting_MaxCrashReportsSize = 0;
-        bool setting_MakeCompatCore = false;
-        parse_conf(CONF_DIR"/plugins/CCpp.conf", &setting_MaxCrashReportsSize, &setting_MakeCompatCore);
-
-        if (setting_MaxCrashReportsSize > 0)
-        {
-            check_free_space(setting_MaxCrashReportsSize);
-        }
-
-        char path[PATH_MAX];
-
-        /* Check /var/cache/abrt/last-ccpp marker, do not dump repeated crashes
-         * if they happen too often. Else, write new marker value.
-         */
-        snprintf(path, sizeof(path), "%s/last-ccpp", dddir);
-        fd = open(path, O_RDWR | O_CREAT, 0600);
-        if (fd >= 0)
-        {
-            int sz;
-            fstat(fd, &sb); /* !paranoia. this can't fail. */
-
-            if (sb.st_size != 0 /* if it wasn't created by us just now... */
-	     && (unsigned)(time(NULL) - sb.st_mtime) < 20 /* and is relatively new [is 20 sec ok?] */
-            ) {
-                sz = read(fd, path, sizeof(path)-1); /* (ab)using path as scratch buf */
-                if (sz > 0)
-                {
-                    path[sz] = '\0';
-                    if (strcmp(executable, path) == 0)
-                    {
-                        error_msg("not dumping repeating crash in '%s'", executable);
-                        if (setting_MakeCompatCore)
-                            goto create_user_core;
-                        return 1;
-                    }
-                }
-                lseek(fd, 0, SEEK_SET);
-            }
-            sz = write(fd, executable, strlen(executable));
-            if (sz >= 0)
-                ftruncate(fd, sz);
-            close(fd);
-        }
-
-        if (strstr(executable, "/abrtd"))
-        {
-            /* If abrtd crashes, we don't want to create a _directory_,
-             * since that can make new copy of abrtd to process it,
-             * and maybe crash again...
-             * Unlike dirs, mere files are ignored by abrtd.
-             */
-            snprintf(path, sizeof(path), "%s/abrtd-coredump", dddir);
-            core_fd = xopen3(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-            core_size = copyfd_eof(STDIN_FILENO, core_fd);
-            if (core_size < 0 || close(core_fd) != 0)
-            {
-                unlink(path);
-                /* copyfd_eof logs the error including errno string,
-                 * but it does not log file name */
-                error_msg_and_die("error saving coredump to %s", path);
-            }
-            log("saved core dump of pid %lu (%s) to %s (%llu bytes)", (long)pid, executable, path, (long long)core_size);
-            return 0;
-        }
-
-        char* cmdline = get_cmdline(pid); /* never NULL */
-        const char *signame = strsignal(signal_no);
-        char *reason = xasprintf("Process was terminated by signal %s (%s)", signal_str, signame ? signame : signal_str);
-
-        snprintf(path, sizeof(path), "%s/ccpp-%ld-%lu", dddir, (long)time(NULL), (long)pid);
-        CDebugDump dd;
-        dd.Create(path, uid);
-        dd.SaveText(FILENAME_ANALYZER, "CCpp");
-        dd.SaveText(FILENAME_EXECUTABLE, executable);
-        dd.SaveText(FILENAME_CMDLINE, cmdline);
-        dd.SaveText(FILENAME_REASON, reason);
-
-        int len = strlen(path);
-        snprintf(path + len, sizeof(path) - len, "/"FILENAME_COREDUMP);
-
-        /* We need coredumps to be readable by all, because
-         * when abrt daemon processes coredump,
-         * process producing backtrace is run under the same UID
-         * as the crashed process.
-         * Thus 644, not 600 */
-        core_fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0644);
-        if (core_fd < 0)
-        {
-            dd.Delete();
-            dd.Close();
-            perror_msg_and_die("can't open '%s'", path);
-        }
-//TODO: chown to uid:abrt?
-//Currently it is owned by 0:0 but is readable by anyone, so the owner
-//of the crashed binary still can access it, as he has
-//r-x access to the dump dir.
-        core_size = copyfd_eof(STDIN_FILENO, core_fd);
-        if (core_size < 0 || fsync(core_fd) != 0)
-        {
-            unlink(path);
-            dd.Delete();
-            dd.Close();
-            /* copyfd_eof logs the error including errno string,
-             * but it does not log file name */
-            error_msg_and_die("error saving coredump to %s", path);
-        }
-        lseek(core_fd, 0, SEEK_SET);
-        /* note: core_fd is still open, we may use it later to copy core to user's dir */
-        log("saved core dump of pid %lu (%s) to %s (%llu bytes)", (long)pid, executable, path, (long long)core_size);
-        free(executable);
-        free(cmdline);
-        path[len] = '\0'; /* path now contains directory name */
-
-        /* We close dumpdir before we start catering for crash storm case.
-         * Otherwise, delete_debug_dump_dir's from other concurrent
-         * CCpp's won't be able to delete our dump (their delete_debug_dump_dir
-         * will wait for us), and we won't be able to delete their dumps.
-         * Classic deadlock.
-         */
-        dd.Close();
-
-        /* rhbz#539551: "abrt going crazy when crashing process is respawned" */
-        if (setting_MaxCrashReportsSize > 0)
-        {
-            trim_debug_dumps(setting_MaxCrashReportsSize, path);
-        }
-
-        if (!setting_MakeCompatCore)
-            return 0;
-        /* fall through to creating user core */
-    }
-    catch (CABRTException& e)
-    {
-        error_msg_and_die("%s", e.what());
-    }
-    catch (std::exception& e)
-    {
-        error_msg_and_die("%s", e.what());
-    }
-
-
- create_user_core:
-    /* note: core_size may be == 0 ("unknown") */
-    if (core_size > ulimit_c || ulimit_c == 0)
-        return 0;
-
-    /* Write a core file for user */
-
-    struct passwd* pw = getpwuid(uid);
-    gid_t gid = pw ? pw->pw_gid : uid;
-    setgroups(1, &gid);
-    xsetregid(gid, gid);
-    xsetreuid(uid, uid);
-
-    errno = 0;
-    if (user_pwd == NULL
-     || chdir(user_pwd) != 0
-    ) {
-        perror_msg_and_die("can't cd to %s", user_pwd);
-    }
-
-    /* Mimic "core.PID" if requested */
-    char core_basename[sizeof("core.%lu") + sizeof(long)*3] = "core";
-    char buf[] = "0\n";
-    fd = open("/proc/sys/kernel/core_uses_pid", O_RDONLY);
-    if (fd >= 0)
-    {
-        read(fd, buf, sizeof(buf));
-        close(fd);
-    }
-    if (strcmp(buf, "1\n") == 0)
-    {
-        sprintf(core_basename, "core.%lu", (long)pid);
-    }
-
-    /* man core:
-     * There are various circumstances in which a core dump file
-     * is not produced:
-     *
-     * [skipped obvious ones]
-     * The process does not have permission to write the core file.
-     * ...if a file with the same name exists and is not writable
-     * or is not a regular file (e.g., it is a directory or a symbolic link).
-     *
-     * A file with the same name already exists, but there is more
-     * than one hard link to that file.
-     *
-     * The file system where the core dump file would be created is full;
-     * or has run out of inodes; or is mounted read-only;
-     * or the user has reached their quota for the file system.
-     *
-     * The RLIMIT_CORE or RLIMIT_FSIZE resource limits for the process
-     * are set to zero.
-     * [shouldn't it be checked by kernel? 2.6.30.9-96 doesn't, still
-     * calls us even if "ulimit -c 0"]
-     *
-     * The binary being executed by the process does not have
-     * read permission enabled. [how we can check it here?]
-     *
-     * The process is executing a set-user-ID (set-group-ID) program
-     * that is owned by a user (group) other than the real
-     * user (group) ID of the process. [TODO?]
-     * (However, see the description of the prctl(2) PR_SET_DUMPABLE operation,
-     * and the description of the /proc/sys/fs/suid_dumpable file in proc(5).)
-     */
-
-    /* Do not O_TRUNC: if later checks fail, we do not want to have file already modified here */
-    errno = 0;
-    int usercore_fd = open(core_basename, O_WRONLY | O_CREAT | O_NOFOLLOW, 0600); /* kernel makes 0600 too */
-    if (usercore_fd < 0
-     || fstat(usercore_fd, &sb) != 0
-     || !S_ISREG(sb.st_mode)
-     || sb.st_nlink != 1
-    /* kernel internal dumper checks this too: if (inode->i_uid != current->fsuid) <fail>, need to mimic? */
-    ) {
-        perror_msg_and_die("%s/%s is not a regular file with link count 1", user_pwd, core_basename);
-    }
-
-    /* Note: we do not copy more than ulimit_c */
-    off_t size;
-    if (ftruncate(usercore_fd, 0) != 0
-     || (size = copyfd_size(core_fd, usercore_fd, ulimit_c)) < 0
-     || close(usercore_fd) != 0
-    ) {
-        /* perror first, otherwise unlink may trash errno */
-        perror_msg("write error writing %s/%s", user_pwd, core_basename);
-        unlink(core_basename);
-        return 1;
-    }
-    if (size == ulimit_c && size != core_size)
-    {
-        /* We copied exactly ulimit_c bytes (and it doesn't accidentally match
-         * core_size (imagine exactly 1MB coredump with "ulimit -c 1M" - that'd be ok)),
-         * it means that core is larger than ulimit_c. Abort and delete the dump.
-         */
-        unlink(core_basename);
-        return 1;
-    }
-    log("saved core dump of pid %lu to %s/%s (%llu bytes)", (long)pid, user_pwd, core_basename, (long long)size);
-
-    return 0;
-}