** Also affects: ecryptfs-utils (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
getpwuid fails silently when run as root inside of mlockall()
https://bugs.launchpad.net/bugs/329264
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Status in “ecryptfs-utils” source package in Ubuntu: New
Status in “glibc” source package in Ubuntu: Confirmed
Status in “linux” source package in Ubuntu: New
Bug description:
Use this test program
#include <pwd.h>
#include <stdio.h>
#include <errno.h>
#include <sys/mman.h>
int main() {
struct passwd *pw = NULL;
uid_t id;
if (mlockall(MCL_FUTURE)<0) {
perror("mlockall");
return 1;
}
id = getuid();
pw = getpwuid(id);
if (pw == NULL) {
perror("getpwuid");
return errno;
}
printf("[%s]\n", pw->pw_name);
return 0;
}
Build on Intrepid, and on Jaunty.
Run as root and non-root.
r...@jaunty:
getpwuid: Success
kirkl...@jaunty:
getpwuid: Resource temporarily unavailable
r...@intrepid:
[root]
kirkl...@intrepid:
getpwuid: Resource temporarily unavailable
Running this program as root on intrepid used to work. It does not in Jaunty.
Additionally, errno is not set.
This regression is breaking mount.ecryptfs, which does a getpwuid() inside of
just such an mlock.
:-Dustin
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