Date: Tue, 9 May 2017 16:29:06 +0000 (UTC) From: Brooks Davis <brooks@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r318030 - stable/10/lib/libc/regex Message-ID: <201705091629.v49GT6Dn032374@repo.freebsd.org>
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Author: brooks Date: Tue May 9 16:29:06 2017 New Revision: 318030 URL: https://svnweb.freebsd.org/changeset/base/318030 Log: MFC r317707: Correct an out-of-bounds read in regcomp when the RE is bad. When passed the invalid regular expression "a**", the error is eventually detected and seterr() is called. It sets p->error appropriatly and p->next and p->end to nuls which is a never used char nuls[10] which is zeros due to .bss initialization. Unfortunatly, p_ere_exp() and p_simp_re() both have fall through cases where they set the error, decrement p->next and access it which means a read from whatever .bss variable comes before nuls. Found with regex_test:repet_multi and CHERI bounds checking. Reviewed by: ngie, pfg, emaste Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D10541 Modified: stable/10/lib/libc/regex/regcomp.c Directory Properties: stable/10/ (props changed) Modified: stable/10/lib/libc/regex/regcomp.c ============================================================================== --- stable/10/lib/libc/regex/regcomp.c Tue May 9 16:27:20 2017 (r318029) +++ stable/10/lib/libc/regex/regcomp.c Tue May 9 16:29:06 2017 (r318030) @@ -444,6 +444,8 @@ p_ere_exp(struct parse *p) (void)REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT); /* FALLTHROUGH */ default: + if (p->error != 0) + return; p->next--; wc = WGETNEXT(); ordinary(p, wc); @@ -651,6 +653,8 @@ p_simp_re(struct parse *p, (void)REQUIRE(starordinary, REG_BADRPT); /* FALLTHROUGH */ default: + if (p->error != 0) + return(0); /* Definitely not $... */ p->next--; wc = WGETNEXT(); ordinary(p, wc);
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