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From d8ddfcf4e0f7342f362d587a2789d69773a20f1c Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Tue, 21 May 2019 14:56:47 +0000
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Subject: [PATCH] daemon: avoid infinite crash loops
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Export an environment variable as a mark for abrtd (abrt-server) to
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identify processes directly involved in ABRT post-mortem processing.
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We must not run post-mortem EVENTs on problem directories caused by ABRT
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itself because we could create an infinite loop.
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There are to ways how to handle such directories:
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* in non-debug mode: log a short message and remove them without
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other actions - we must not leave them in the dump location by
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default because the dump location would be growing
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* in debug mode: log a more verbose message and leave them as they
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are - we don need to have worries about the dump location growing
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because someone intentionally enable the debug mode
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Related: rhbz#1246539
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cherry-picked from https://github.com/abrt/abrt/commit/68e0efaa36f6d4aabfd8ecf71bf0c22adfc72b03
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Related: rhbz#1688368
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Signed-off-by: Martin Kutlak <mkutlak@redhat.com>
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---
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src/daemon/abrt-server.c | 54 ++++++++++++++++++++++++++++++++++++++--
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1 file changed, 52 insertions(+), 2 deletions(-)
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diff --git a/src/daemon/abrt-server.c b/src/daemon/abrt-server.c
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index e1dfc4af..60eb9b66 100644
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--- a/src/daemon/abrt-server.c
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+++ b/src/daemon/abrt-server.c
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@@ -28,6 +28,7 @@
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/* We exit after this many seconds */
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#define TIMEOUT 10
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+#define ABRT_SERVER_EVENT_ENV "ABRT_SERVER_PID"
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/*
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Unix socket in ABRT daemon for creating new dump directories.
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@@ -206,10 +207,11 @@ static pid_t spawn_event_handler_child(const char *dump_dir_name, const char *ev
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int flags = EXECFLG_INPUT_NUL | EXECFLG_OUTPUT | EXECFLG_QUIET | EXECFLG_ERR2OUT;
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VERB1 flags &= ~EXECFLG_QUIET;
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- char *env_vec[2];
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+ char *env_vec[3];
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/* Intercept ASK_* messages in Client API -> don't wait for user response */
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env_vec[0] = xstrdup("REPORT_CLIENT_NONINTERACTIVE=1");
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- env_vec[1] = NULL;
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+ env_vec[1] = xasprintf("%s=%d", ABRT_SERVER_EVENT_ENV, getpid());
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+ env_vec[2] = NULL;
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pid_t child = fork_execv_on_steroids(flags, args, pipeout,
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env_vec, /*dir:*/ NULL,
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@@ -219,6 +221,23 @@ static pid_t spawn_event_handler_child(const char *dump_dir_name, const char *ev
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return child;
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}
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+static int problem_dump_dir_was_provoked_by_abrt_event(struct dump_dir *dd, char **provoker)
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+{
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+ char *env_var = NULL;
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+ const int r = dd_get_env_variable(dd, ABRT_SERVER_EVENT_ENV, &env_var);
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+
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+ /* Dump directory doesn't contain the environ file */
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+ if (r == -ENOENT)
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+ return 0;
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+
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+ if (provoker != NULL)
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+ *provoker = env_var;
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+ else
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+ free(env_var);
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+
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+ return env_var != NULL;
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+}
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+
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static gboolean emit_new_problem_signal(gpointer data)
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{
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struct waiting_context *context = (struct waiting_context *)data;
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@@ -254,6 +273,37 @@ static int run_post_create(const char *dirname)
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if (g_settings_privatereports)
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{
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struct dump_dir *dd = dd_opendir(dirname, DD_OPEN_READONLY);
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+
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+ char *provoker = NULL;
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+ const bool event_dir = dd && problem_dump_dir_was_provoked_by_abrt_event(dd, &provoker);
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+ if (event_dir)
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+ {
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+ if (g_settings_debug_level == 0)
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+ {
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+ error_msg("Removing problem provoked by ABRT(pid:%s): '%s'", provoker, dirname);
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+ dd_delete(dd);
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+ }
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+ else
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+ {
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+ char *dumpdir = NULL;
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+ char *event = NULL;
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+ char *reason = NULL;
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+ char *cmdline = NULL;
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+
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+ /* Ignore errors */
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+ dd_get_env_variable(dd, "DUMP_DIR", &dumpdir);
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+ dd_get_env_variable(dd, "EVENT", &event);
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+ reason = dd_load_text(dd, FILENAME_REASON);
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+ cmdline = dd_load_text(dd, FILENAME_CMDLINE);
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+
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+ error_msg("ABRT_SERVER_PID=%s;DUMP_DIR='%s';EVENT='%s';REASON='%s';CMDLINE='%s'",
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+ provoker, dumpdir, event, reason, cmdline);
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+ }
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+
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+ free(provoker);
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+ return 400;
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+ }
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+
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const bool complete = dd && problem_dump_dir_is_complete(dd);
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dd_close(dd);
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if (complete)
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--
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2.21.0
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