fe873a1c10
next round of patches - allow X forwarding over IPv4 when IPv6 sockets is not available [openssh-7.2p2-X_forward_with_disabled_ipv6.patch] - do not write PID file when not daemonizing [openssh-7.2p2-no_fork-no_pid_file.patch] - use correct options when invoking login [openssh-7.2p2-login_options.patch] - helper application for retrieving users' public keys from an LDAP server [openssh-7.2p2-ldap.patch] - allow forcing permissions over sftp [openssh-7.2p2-sftp_force_permissions.patch] - do not perform run-time checks for OpenSSL API/ABI change [openssh-7.2p2-disable-openssl-abi-check.patch] - suggest commands for cleaning known hosts file [openssh-7.2p2-host_ident.patch] - sftp home chroot patch [openssh-7.2p2-sftp_homechroot.patch] - ssh sessions auditing [openssh-7.2p2-audit.patch] - enable seccomp sandbox on additional architectures [openssh-7.2p2-additional_seccomp_archs.patch] OBS-URL: https://build.opensuse.org/request/show/432093 OBS-URL: https://build.opensuse.org/package/show/network/openssh?expand=0&rev=112
77 lines
2.2 KiB
Diff
77 lines
2.2 KiB
Diff
# HG changeset patch
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# Parent 0c50460ce313d041c2484d21ab810c8ee487cded
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block SIGALRM while logging through syslog to prevent deadlocks
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(through grace_alarm_handler())
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bnc#57354
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diff --git a/openssh-7.2p2/log.c b/openssh-7.2p2/log.c
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--- a/openssh-7.2p2/log.c
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+++ b/openssh-7.2p2/log.c
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@@ -46,16 +46,17 @@
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#include <syslog.h>
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#include <unistd.h>
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#include <errno.h>
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#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H) && !defined(BROKEN_STRNVIS)
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# include <vis.h>
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#endif
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#include "log.h"
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+#include <signal.h>
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static LogLevel log_level = SYSLOG_LEVEL_INFO;
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static int log_on_stderr = 1;
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static int log_stderr_fd = STDERR_FILENO;
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static int log_facility = LOG_AUTH;
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static char *argv0;
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static log_handler_fn *log_handler;
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static void *log_handler_ctx;
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@@ -383,16 +384,17 @@ do_log(LogLevel level, const char *fmt,
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{
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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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struct syslog_data sdata = SYSLOG_DATA_INIT;
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#endif
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char msgbuf[MSGBUFSIZ];
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char fmtbuf[MSGBUFSIZ];
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char *txt = NULL;
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int pri = LOG_INFO;
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+ sigset_t nset, oset;
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int saved_errno = errno;
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log_handler_fn *tmp_handler;
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if (level > log_level)
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return;
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switch (level) {
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case SYSLOG_LEVEL_FATAL:
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@@ -441,20 +443,29 @@ do_log(LogLevel level, const char *fmt,
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tmp_handler = log_handler;
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log_handler = NULL;
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tmp_handler(level, fmtbuf, log_handler_ctx);
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log_handler = tmp_handler;
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} else if (log_on_stderr) {
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snprintf(msgbuf, sizeof msgbuf, "%s\r\n", fmtbuf);
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(void)write(log_stderr_fd, msgbuf, strlen(msgbuf));
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} else {
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+ /* Prevent a race between the grace_alarm
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+ * which writes a log message and terminates
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+ * and main sshd code that leads to deadlock
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+ * as syslog is not async safe.
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+ */
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+ sigemptyset(&nset);
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+ sigaddset(&nset, SIGALRM);
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+ sigprocmask(SIG_BLOCK, &nset, &oset);
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#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
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openlog_r(argv0 ? argv0 : __progname, LOG_PID, log_facility, &sdata);
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syslog_r(pri, &sdata, "%.500s", fmtbuf);
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closelog_r(&sdata);
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#else
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openlog(argv0 ? argv0 : __progname, LOG_PID, log_facility);
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syslog(pri, "%.500s", fmtbuf);
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closelog();
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#endif
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+ sigprocmask(SIG_SETMASK, &oset, NULL);
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}
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errno = saved_errno;
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}
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