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Remove exploitable LD_BIND_NOW hack (CVE-2009-1894).

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Instead of trying to re-execute pulseaudio itself with LD_BIND_NOW set,
just find the correct flag for the linker to request immediate bindings
(all ELF files support that option), and use that when linking the daemon.

Reduce the amount of compiled and executed code as well.
This commit is contained in:
Diego Elio 'Flameeyes' Pettenò 2009-07-07 20:51:53 +02:00
parent ff252cb48d
commit 84200b423e
3 changed files with 8 additions and 24 deletions
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22
src/daemon/main.c
View file

@ -401,28 +401,6 @@ int main(int argc, char *argv[]) {
pa_log_set_level(PA_LOG_NOTICE);
pa_log_set_flags(PA_LOG_COLORS|PA_LOG_PRINT_FILE|PA_LOG_PRINT_LEVEL, PA_LOG_RESET);
#if defined(__linux__) && defined(__OPTIMIZE__)
/*
Disable lazy relocations to make usage of external libraries
more deterministic for our RT threads. We abuse __OPTIMIZE__ as
a check whether we are a debug build or not.
*/
if (!getenv("LD_BIND_NOW")) {
char *rp;
/* We have to execute ourselves, because the libc caches the
* value of $LD_BIND_NOW on initialization. */
pa_set_env("LD_BIND_NOW", "1");
if ((rp = pa_readlink("/proc/self/exe")))
pa_assert_se(execv(rp, argv) == 0);
else
pa_log_warn("Couldn't read /proc/self/exe, cannot self execute. Running in a chroot()?");
}
#endif
if ((e = getenv("PULSE_PASSED_FD"))) {
passed_fd = atoi(e);