diff options
Diffstat (limited to 'debian/patches/Disable-async-signal-unsafe-code-from-the-sshsigdie-.patch')
| -rw-r--r-- | debian/patches/Disable-async-signal-unsafe-code-from-the-sshsigdie-.patch | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/debian/patches/Disable-async-signal-unsafe-code-from-the-sshsigdie-.patch b/debian/patches/Disable-async-signal-unsafe-code-from-the-sshsigdie-.patch new file mode 100644 index 0000000..70a329d --- /dev/null +++ b/debian/patches/Disable-async-signal-unsafe-code-from-the-sshsigdie-.patch @@ -0,0 +1,36 @@ +From 96af055c9d7bfd2e974e0ef889848fa401057c0d Mon Sep 17 00:00:00 2001 +From: Salvatore Bonaccorso <carnil@debian.org> +Date: Sat, 22 Jun 2024 21:33:03 +0200 +Subject: [PATCH] Disable async-signal-unsafe code from the sshsigdie() + function + +Address signal handler race condition: if a client does not authenticate +within LoginGraceTime seconds (120 by default, 600 in old OpenSSH +versions), then sshd's SIGALRM handler is called asynchronously, but +this signal handler calls various functions that are not +async-signal-safe (for example, syslog()). + +This is a regression from CVE-2006-5051 ("Signal handler race condition +in OpenSSH before 4.4 allows remote attackers to cause a denial of +service (crash), and possibly execute arbitrary code") + +Signed-off-by: Salvatore Bonaccorso <carnil@debian.org> +--- + +--- a/log.c ++++ b/log.c +@@ -452,12 +452,14 @@ void + sshsigdie(const char *file, const char *func, int line, int showfunc, + LogLevel level, const char *suffix, const char *fmt, ...) + { ++#if 0 + va_list args; + + va_start(args, fmt); + sshlogv(file, func, line, showfunc, SYSLOG_LEVEL_FATAL, + suffix, fmt, args); + va_end(args); ++#endif + _exit(1); + } + |