[Bug libc/15576] New: sysconf may change returned value during the lifetime of a process.

[Bug libc/15576] New: sysconf may change returned value during the lifetime of a process.

[aoliva at redhat dot com]

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http://sourceware.org/bugzilla/show_bug.cgi?id=15576

            Bug ID: 15576
           Summary: sysconf may change returned value during the lifetime
                    of a process.
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: aoliva at redhat dot com
                CC: drepper.fsp at gmail dot com

Posix requires “The value shall not change during the lifetime of the calling
process, except that sysconf(_SC_OPEN_MAX) may return different values before
and after a call to setrlimit() which changes the RLIMIT_NOFILE soft limit.”

In my code review, I noticed the returned value may change over time for
TZNAME_MAX, depending on selected timezones; NPROCS, NPROCS_CONF, PHYS_PAGES,
AVPHYS_PAGES, NGROUPS_MAX, SIGQUEUE_MAX, depending on variable values read from
/proc at each call, and from rlimit-obtained values CHILD_MAX, OPEN_MAX,
ARG_MAX, SIGQUEUE_MAX.

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From: "schwab@linux-m68k.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nscd/15577] New: nscd crashes over absent values from netgroup tuple
Date: Wed, 05 Jun 2013 08:29:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id\x15577

            Bug ID: 15577
           Summary: nscd crashes over absent values from netgroup tuple
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nscd
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
                CC: drepper.fsp at gmail dot com

>From <https://bugzilla.novell.com/show_bug.cgi?id9524>:

nscd crashes while processing a netgroup entry where one or more values from
the (host,user,domain) triple are absent.  Reproducable by adding this line to
/etc/netgroup:

powerusers (,miquels,) (,torvalds,) (,fubar,)

and running getent netgroup powerusers.

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[Bug libc/15576] sysconf may change returned value during the lifetime of a process.

[ondra at iuuk dot mff.cuni.cz]

http://sourceware.org/bugzilla/show_bug.cgi?id=15576

OndrejBilka <ondra at iuuk dot mff.cuni.cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ondra at iuuk dot mff.cuni.cz

--- Comment #1 from OndrejBilka <ondra at iuuk dot mff.cuni.cz> ---
Could you separate which of them are specified by POSIX and which are
extension?

Manpage says that PHYS_PAGES is not standard, and does not mention
SIGQUEUE_MAX.

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[Bug libc/15576] sysconf may change returned value during the lifetime of a process.

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15576

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

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