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gnu: mtools: 'mformat' initializes boot sector before writing it.

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This is the last bit fixing <https://bugs.gnu.org/35283>.

Previously, 'mformat' (used by 'grub-mkrescue') would pass uninitialized
bytes to write(2), leading to non-deterministic FAT image contents.
This patch fixes that.

* gnu/packages/patches/mtools-mformat-uninitialized.patch: New file.
* gnu/packages/mtools.scm (mtools)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.
This commit is contained in:
Ludovic Courtès 2019-04-21 00:46:44 +02:00
parent 5502fbd7fd
commit 1b0b1651b1
No known key found for this signature in database
GPG key ID: 090B11993D9AEBB5
3 changed files with 33 additions and 10 deletions
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1
gnu/local.mk
View file

@ -1078,6 +1078,7 @@ dist_patch_DATA = \
%D%/packages/patches/mozjs38-tracelogger.patch \
%D%/packages/patches/mozjs38-version-detection.patch \
%D%/packages/patches/mrrescue-support-love-11.patch \
%D%/packages/patches/mtools-mformat-uninitialized.patch \
%D%/packages/patches/mumble-1.2.19-abs.patch \
%D%/packages/patches/mumps-build-parallelism.patch \
%D%/packages/patches/mupen64plus-ui-console-notice.patch \

12
gnu/packages/mtools.scm
View file

@ -1,6 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 John Darrington <jmd@gnu.org>
;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
;;;
@ -23,20 +23,22 @@ (define-module (gnu packages mtools)
#:use-module (guix licenses)
#:use-module (guix packages)
#:use-module (guix download)
#:use-module (guix build-system gnu))
#:use-module (guix build-system gnu)
#:use-module (gnu packages))
(define-public mtools
(package
(name "mtools")
(version "4.0.23")
(source
(origin
(source (origin
(method url-fetch)
(uri (string-append "mirror://gnu/mtools/mtools-"
version ".tar.bz2"))
(sha256
(base32
"1qwfxzr964fasxlzhllahk8mzh7c82s808wvly95dsqsflkdp27i"))))
"1qwfxzr964fasxlzhllahk8mzh7c82s808wvly95dsqsflkdp27i"))
(patches
(search-patches "mtools-mformat-uninitialized.patch"))))
(build-system gnu-build-system)
(home-page "https://www.gnu.org/software/mtools/")
(synopsis "Access MS-DOS disks without mounting")

20
gnu/packages/patches/mtools-mformat-uninitialized.patch Normal file
View file

@ -0,0 +1,20 @@
Fix a bug whereby 'mformat' could end up passing uninitialized bytes
to write(2). This could be reproduced with:
mformat -C -f 1440 -L 16 -N 77777777 -i /tmp/x ::
where the output of /tmp/x would be non-deterministic.
Patch by Ludovic Courtès <ludo@gnu.org>.
--- mtools-4.0.23/mformat.c 2019-04-21 00:12:01.496116195 +0200
+++ mtools-4.0.23/mformat.c 2019-04-21 00:12:36.675967157 +0200
@@ -927,6 +927,7 @@ void mformat(int argc, char **argv, int
char *endptr;
+ memset(&boot.bytes, '\0', sizeof boot);
hs = hs_set = 0;
argtracks = 0;
argheads = 0;