Date: Fri, 21 Oct 2011 15:29:41 +0530 From: Huzaifa Sidhpurwala <huzaifas@...hat.com> To: oss-security@...ts.openwall.com CC: Solar Designer <solar@...nwall.com> Subject: Re: hardlink(1) has buffer overflows, is unsafe on changing trees On 10/20/2011 08:27 PM, Josh Bressers wrote: >> The hardlink(1) program from Fedora is susceptible to buffer overflows of >> fixed-size nambuf1 and nambuf2 buffers when run on a tree with deeply >> nested directories and/or with long directory or file names. I was able >> to reproduce the problem (got a segfault) by running the program on a >> directory containing 20 nested directories with 250-character names. >> > > CVE-2011-3630 hardlink buffer overflows > https://bugzilla.redhat.com/show_bug.cgi?id=746709 > FORTIFY_SOURCE should really be able to catch this buffer overflow. The buffer being overflown here in in BSS, But strcat() is used to append to this buffer and __builtin___strcat_chk catches it, resulting in the program being terminated. Nice one though! -- Huzaifa Sidhpurwala / Red Hat Security Response Team
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