git: d988621b0c25 - main - setusercontext(): Better error messages when priority is not set correctly
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Date: Mon, 29 Jan 2024 22:32:14 UTC
The branch main has been updated by olce: URL: https://cgit.FreeBSD.org/src/commit/?id=d988621b0c25209866ed5a98b1a8b20269935761 commit d988621b0c25209866ed5a98b1a8b20269935761 Author: Olivier Certner <olce@FreeBSD.org> AuthorDate: 2023-05-29 16:39:04 +0000 Commit: Olivier Certner <olce@FreeBSD.org> CommitDate: 2024-01-29 21:58:07 +0000 setusercontext(): Better error messages when priority is not set correctly Polish the syslog messages to contain readily useful information. Behavior of capability 'priority' is inconsistent with what is done for all other contexts: 'umask', 'cpumask', resource limits, etc., where an absence of capability means to inherit the value. It is currently preserved for compatibility, but is subject to change on a future major release. Reviewed by: emaste, kib (older version) Approved by: emaste (mentor) MFC after: 3 days Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40349 --- lib/libutil/login_class.c | 51 +++++++++++++++++++++++++++++++---------------- 1 file changed, 34 insertions(+), 17 deletions(-) diff --git a/lib/libutil/login_class.c b/lib/libutil/login_class.c index ee0cec3423f5..269349a49dad 100644 --- a/lib/libutil/login_class.c +++ b/lib/libutil/login_class.c @@ -473,9 +473,7 @@ setlogincontext(login_cap_t *lc, const struct passwd *pwd, unsigned long flags) int setusercontext(login_cap_t *lc, const struct passwd *pwd, uid_t uid, unsigned int flags) { - rlim_t p; login_cap_t *llc = NULL; - struct rtprio rtp; int error; if (lc == NULL) { @@ -492,30 +490,49 @@ setusercontext(login_cap_t *lc, const struct passwd *pwd, uid_t uid, unsigned in /* Set the process priority */ if (flags & LOGIN_SETPRIORITY) { - p = login_getcapnum(lc, "priority", LOGIN_DEFPRI, LOGIN_DEFPRI); + const rlim_t def_val = LOGIN_DEFPRI, err_val = INT64_MIN; + rlim_t p = login_getcapnum(lc, "priority", def_val, err_val); + int rc; + + if (p == err_val) { + /* Invariant: 'lc' != NULL. */ + syslog(LOG_WARNING, + "%s%s%sLogin class '%s': " + "Invalid priority specification: '%s'", + pwd ? "Login '" : "", + pwd ? pwd->pw_name : "", + pwd ? "': " : "", + lc->lc_class, + login_getcapstr(lc, "priority", "", "")); + /* Reset the priority, as if the capability was not present. */ + p = def_val; + } if (p > PRIO_MAX) { + struct rtprio rtp; + rtp.type = RTP_PRIO_IDLE; p += RTP_PRIO_MIN - (PRIO_MAX + 1); rtp.prio = p > RTP_PRIO_MAX ? RTP_PRIO_MAX : p; - if (rtprio(RTP_SET, 0, &rtp)) - syslog(LOG_WARNING, "rtprio '%s' (%s): %m", - pwd ? pwd->pw_name : "-", - lc ? lc->lc_class : LOGIN_DEFCLASS); + rc = rtprio(RTP_SET, 0, &rtp); } else if (p < PRIO_MIN) { + struct rtprio rtp; + rtp.type = RTP_PRIO_REALTIME; p += RTP_PRIO_MAX - (PRIO_MIN - 1); rtp.prio = p < RTP_PRIO_MIN ? RTP_PRIO_MIN : p; - if (rtprio(RTP_SET, 0, &rtp)) - syslog(LOG_WARNING, "rtprio '%s' (%s): %m", - pwd ? pwd->pw_name : "-", - lc ? lc->lc_class : LOGIN_DEFCLASS); - } else { - if (setpriority(PRIO_PROCESS, 0, (int)p) != 0) - syslog(LOG_WARNING, "setpriority '%s' (%s): %m", - pwd ? pwd->pw_name : "-", - lc ? lc->lc_class : LOGIN_DEFCLASS); - } + rc = rtprio(RTP_SET, 0, &rtp); + } else + rc = setpriority(PRIO_PROCESS, 0, (int)p); + + if (rc != 0) + syslog(LOG_WARNING, + "%s%s%sLogin class '%s': " + "Setting priority failed: %m", + pwd ? "Login '" : "", + pwd ? pwd->pw_name : "", + pwd ? "': " : "", + lc ? lc->lc_class : "<none>"); } /* Setup the user's group permissions */