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su: reset also RLIMIT_FSIZE and RLIMIT_NOFILE 

Addresses: https://github.com/linux-pam/linux-pam/issues/85
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2021-10-04 15:39:40 +02:00
parent c3ea860b9f
commit 08273c672b
2 changed files with 15 additions and 1 deletions
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14
login-utils/su-common.c
View File

@ -959,13 +959,27 @@ static int is_not_root(void)
return (uid_t) 0 == ruid && ruid == euid ? 0 : 1;
}
/* Don't rely on PAM and reset the most important limits. */
static void sanitize_prlimits(void)
{
#ifdef HAVE_SYS_RESOURCE_H
struct rlimit lm = { .rlim_cur = 0, .rlim_max = 0 };
/* reset to zero */
setrlimit(RLIMIT_NICE, &lm);
setrlimit(RLIMIT_RTPRIO, &lm);
/* reset to unlimited */
lm.rlim_cur = RLIM_INFINITY;
lm.rlim_max = RLIM_INFINITY;
setrlimit(RLIMIT_FSIZE, &lm);
/* reset soft limit only */
getrlimit(RLIMIT_NOFILE, &lm);
if (lm.rlim_cur != FD_SETSIZE) {
lm.rlim_cur = FD_SETSIZE;
setrlimit(RLIMIT_NOFILE, &lm);
}
#endif
}

2
login-utils/su.1.adoc
View File

@ -29,7 +29,7 @@ This version of *su* uses PAM for authentication, account and session management
Note that *su* in all cases uses PAM (*pam_getenvlist*(3)) to do the final environment modification. Command-line options such as *--login* and *--preserve-environment* affect the environment before it is modified by PAM.
Since version 2.38 *su* resets process resource limits RLIMIT_NICE and RLIMIT_RTPRIO to zero.
Since version 2.38 *su* resets process resource limits RLIMIT_NICE, RLIMIT_RTPRIO, RLIMIT_FSIZE and RLIMIT_NOFILE.
== OPTIONS