public inbox for glibc-bugs@sourceware.org help / color / mirror / Atom feed
From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug network/14889] svc_run() produces high cpu usage when accept() fails with EMFILE (CVE-2011-4609) Date: Thu, 10 Dec 2020 10:13:16 +0000 [thread overview] Message-ID: <bug-14889-131-DfNaGQBRGW@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-14889-131@http.sourceware.org/bugzilla/> https://sourceware.org/bugzilla/show_bug.cgi?id=14889 --- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Stefan Liebler <stli@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4b2e40a9259fab08161e1c607b06a41e15d543dc commit 4b2e40a9259fab08161e1c607b06a41e15d543dc Author: Stefan Liebler <stli@linux.ibm.com> Date: Fri Dec 4 17:00:27 2020 +0100 Handle out-of-memory case in svc_tcp.c/svc_unix.c:rendezvous_request. If glibc is build with -O3 on at least 390 (-m31) or x86 (-m32), gcc 11 dumps this warning: svc_tcp.c: In function 'rendezvous_request': svc_tcp.c:274:3: error: 'memcpy' offset [0, 15] is out of the bounds [0, 0] [-Werror=array-bounds] 274 | memcpy (&xprt->xp_raddr, &addr, sizeof (addr)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors In out-of-memory case, if one of the mallocs in makefd_xprt function returns NULL, a message is dumped, makefd_xprt returns NULL and the subsequent memcpy would copy to NULL. Instead of a segfaulting, we delay a bit (see also __svc_accept_failed and Bug 14889 (CVE-2011-4609) - svc_run() produces high cpu usage when accept() fails with EMFILE (CVE-2011-4609). The same applies to svc_unix.c. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> -- You are receiving this mail because: You are on the CC list for the bug.
prev parent reply other threads:[~2020-12-10 10:13 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-11-28 21:09 [Bug network/14889] New: CVE-2011-4609 svc_run() produces high cpu usage when accept() fails with EMFILE law at redhat dot com 2012-11-28 21:17 ` [Bug network/14889] " law at redhat dot com 2014-06-13 9:26 ` fweimer at redhat dot com 2015-01-16 16:59 ` cvs-commit at gcc dot gnu.org 2015-01-29 18:50 ` cvs-commit at gcc dot gnu.org 2015-02-23 15:03 ` cvs-commit at gcc dot gnu.org 2020-12-10 10:13 ` cvs-commit at gcc dot gnu.org [this message]
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-14889-131-DfNaGQBRGW@http.sourceware.org/bugzilla/ \ --to=sourceware-bugzilla@sourceware.org \ --cc=glibc-bugs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).