Hi,
I simply do not get it... crypt(3) crashes in a PAM module,
raising a segfault, but it does not in a 'standalone version'
of the module.
The code below (which is the minimal I have been able to squeeze
it into) segfaults if run as a pam module. It does not do so
if run standalone (adding the main() and compiling it as an executable).
Any ideas, pointers, misunderstandings on my side?
I can run other libraries (namely OpenSSL) without problems, although
BIO_free_all() also segfaulted...
This happens in two systems at least:
Ubuntu-9, 2.6.24-24-generic #1 SMP, x86_64
Fedora-13, 2.6.33.3-85.fc13.x86_64 #1 SMP
It seems to be related to the 64bit thing, but I am not that
sure. I am copying the error messages:
On the Ubuntu system:
Jun 2 17:06:48 jorge-desktop kernel: [109318.066314] sshd[10318]: segfault at 5e6775f0 rip 7ff45bb900e0 rsp 7fff6644e658 error 4
On the Fedora system:
Jun 2 04:40:42 fedora13 sibyl: Entered module BOGUS
Jun 2 04:40:42 fedora13 sibyl: I can still log after crypt'ing
Jun 2 04:40:42 fedora13 kernel: sshd[1855]: segfault at ffffffffca7c4be0 ip 00007fd8c68fb007 sp 00007fff4efb8b50 error 4 in libc-2.12.so[7fd8c68b3000+175000]
/* notice that one cannot assume Linux has OpenPAM implemented */
#include <pwd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <security/pam_modules.h>
#include <security/pam_appl.h>
int
pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char *argv[])
{
FILE *log;
/* options */
openlog( "sibyl", LOG_CONS, LOG_AUTH);
void syslog(int priority, const char *format, ...);
syslog(LOG_NOTICE, "Entered module BOGUS");
char *c = crypt("petete", "$1$cW0uis36$");
syslog(LOG_NOTICE, "I can still log after crypt'ing");
syslog(LOG_NOTICE, "Encrypted [%s]", c);
return(PAM_AUTH_ERR);
}
/* uncomment for a standalone version
int main(){
pam_sm_authenticate(NULL, 0, 0, NULL);
return(0);
} */
--
Pedro Fortuny Ayuso
http://pfortuny.net
EUITIG, Campus de Viesques, Gijon
Dpto. de Matematicas
Universidad de Oviedo
fortunypedro@xxxxxxxxx
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