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daemon: before exec'ing ourselves, make sure nobody plays games with /proc/self/exe

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This commit is contained in:
Lennart Poettering 2009-07-20 15:47:57 +01:00
parent 6fdd5846b2
commit a2b207e38a
2 changed files with 16 additions and 6 deletions
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16
src/daemon/main.c
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@ -405,7 +405,8 @@ int main(int argc, char *argv[]) {
/*
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.
a check whether we are a debug build or not. This all is
admittedly a bit snake-oilish.
*/
if (!getenv("LD_BIND_NOW")) {
@ -416,9 +417,16 @@ int main(int argc, char *argv[]) {
pa_set_env("LD_BIND_NOW", "1");
if ((rp = pa_readlink("/proc/self/exe")))
pa_assert_se(execv(rp, argv) == 0);
else
if ((rp = pa_readlink("/proc/self/exe"))) {
if (pa_streq(rp, PA_BINARY))
pa_assert_se(execv(rp, argv) == 0);
else
pa_log_warn("/proc/self/exe does not point to " PA_BINARY ", cannot self execute. Are you playing games?");
pa_xfree(rp);
} else
pa_log_warn("Couldn't read /proc/self/exe, cannot self execute. Running in a chroot()?");
}
#endif