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[Bug libc/17273] getmntent() returns wrong default value for fs_passno
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Sat, 29 Aug 2015 22:20:53 +0000
- Subject: [Bug libc/17273] getmntent() returns wrong default value for fs_passno
- Auto-submitted: auto-generated
- References: <bug-17273-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=17273
--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, gentoo/2.21 has been updated
via 460e5da421067eb690ba3b9d11183c4b7db37e4f (commit)
from 43d7ce9238c59c61003994cb26eff4a6a072ebd5 (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=460e5da421067eb690ba3b9d11183c4b7db37e4f
commit 460e5da421067eb690ba3b9d11183c4b7db37e4f
Author: Mike Frysinger <vapier@gentoo.org>
Date: Fri Aug 28 17:08:49 2015 -0400
getmntent: fix memory corruption w/blank lines [BZ #18887]
The fix for BZ #17273 introduced a single byte of memory corruption when
the line is entirely blank. It would walk back past the start of the
buffer if the heap happened to be 0x20 or 0x09 and then write a NUL byte.
buffer = '\n';
end_ptr = buffer;
while (end_ptr[-1] == ' ' || end_ptr[-1] == '\t')
end_ptr--;
*end_ptr = '\0';
Fix that and rework the tests. Adding the testcase for BZ #17273 to the
existing \040 parser does not really make sense as it's unrelated, and
leads to confusing behavior: it implicitly relies on the new entry being
longer than the previous entry (since it just rewinds the FILE*). Split
it out into its own dedicated testcase instead.
(cherry picked from commit b0e805fa0d6fea33745952df7b7f5442ca4c374f)
(cherry picked from commit f2cdbadd8a078482d3b9fc2b59e888c64cc4efae)
-----------------------------------------------------------------------
Summary of changes:
misc/Makefile | 3 +-
misc/mntent_r.c | 4 +-
.../tst-mntent-blank-corrupt.c | 27 +++++++------
.../tst-mntent-blank-passno.c | 40 +++++++++++---------
misc/tst-mntent.c | 20 ----------
5 files changed, 42 insertions(+), 52 deletions(-)
copy libio/test-fmemopen.c => misc/tst-mntent-blank-corrupt.c (60%)
copy math/tst-definitions.c => misc/tst-mntent-blank-passno.c (55%)
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