Rebuilding unscd from source and running an unstripped binary, we see it
crashing in libc's nsswitch.c:875.
#if __OPTION_EGLIBC_INET
/* Called by nscd and nscd alone. */
void
__nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
{
# ifdef PTR_MANGLE
PTR_MANGLE (cb); <---- NULL ptr deref
# endif
nscd_init_cb = cb;
is_nscd = true;
The 'cb' init callback function pointer is apparently optional; the
definition of PTR_DEMANGLE in sysdep.h doesn't say so.
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https://bugs.launchpad.net/bugs/958305
Title:
nscd crashed with SIGSEGV in _nss_files_init()
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