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Accepting request 587442 from home:michalsrb:branches:X11:XOrg

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- u_Use-flexible-array-member-instead-of-fake-size.patch
  * Fixes build error with gcc8. (bnc#1084639)

OBS-URL: https://build.opensuse.org/request/show/587442
OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/libX11?expand=0&rev=41
This commit is contained in:
Stefan Dirsch 2018-03-15 10:56:55 +00:00 committed by Git OBS Bridge
parent 93bb9c1b2d
commit a408f8b0c3
3 changed files with 73 additions and 1 deletions
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6
libX11.changes
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@ -1,3 +1,9 @@
-------------------------------------------------------------------
Thu Mar 15 09:01:19 UTC 2018 - msrb@suse.com
- u_Use-flexible-array-member-instead-of-fake-size.patch
* Fixes build error with gcc8. (bnc#1084639)
-------------------------------------------------------------------
Wed Mar 1 13:48:43 UTC 2017 - tobias.johannes.klausmann@mni.thm.de

5
libX11.spec
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@ -1,7 +1,7 @@
#
# spec file for package libX11
#
# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
@ -34,6 +34,8 @@ Patch7: p_khmer-compose.diff
Patch9: p_xlib_skip_ext_env.diff
# PATCH-FIX-UPSTREAM en-locales.diff fdo#48596 bnc#388711 -- Add missing data for more en locales
Patch15: en-locales.diff
# PATCH-FIX-UPSTREAM u_Use-flexible-array-member-instead-of-fake-size.patch -- Fix build error with gcc8.
Patch16: u_Use-flexible-array-member-instead-of-fake-size.patch
BuildRoot: %{_tmppath}/%{name}-%{version}-build
BuildRequires: autoconf >= 2.60
@ -142,6 +144,7 @@ test -f nls/ja.S90/XLC_LOCALE.pre && exit 1
%patch7 -p0
%patch9 -p0
%patch15 -p0
%patch16 -p1
%build
# Got patches which change auto*files

63
u_Use-flexible-array-member-instead-of-fake-size.patch Normal file
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@ -0,0 +1,63 @@
Author: Michal Srb <msrb@suse.com>
Subject: Use flexible array member instead of fake size.
Patch-mainline: To be upstreamed
References: bnc#1084639
The _XimCacheStruct structure is followed in memory by two strings containing
fname and encoding. The memory was accessed using the last member of the
structure `char fname[1]`. That is a lie, prohibits us from using sizeof and
confuses checkers. Lets declare it properly as a flexible array, so compilers
don't complain about writing past that array. As bonus we can replace the
XOffsetOf with regular sizeof.
Fixes GCC8 error:
In function 'strcpy',
inlined from '_XimWriteCachedDefaultTree' at imLcIm.c:479:5,
inlined from '_XimCreateDefaultTree' at imLcIm.c:616:2,
inlined from '_XimLocalOpenIM' at imLcIm.c:700:5:
/usr/include/bits/string_fortified.h:90:10: error: '__builtin_strcpy'
forming offset 2 is out of the bounds [0, 1] [-Werror=array-bounds]
return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
Caused by this line seemingly writing past the fname[1] array:
imLcIm.c:479: strcpy (m->fname+strlen(name)+1, encoding);
---
modules/im/ximcp/imLcIm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/modules/im/ximcp/imLcIm.c b/modules/im/ximcp/imLcIm.c
index c19695df..743df77b 100644
--- a/modules/im/ximcp/imLcIm.c
+++ b/modules/im/ximcp/imLcIm.c
@@ -82,8 +82,8 @@ struct _XimCacheStruct {
DTCharIndex mbused;
DTCharIndex wcused;
DTCharIndex utf8used;
- char fname[1];
- /* char encoding[1] */
+ char fname[];
+ /* char encoding[] */
};
static struct _XimCacheStruct* _XimCache_mmap = NULL;
@@ -281,7 +281,7 @@ _XimReadCachedDefaultTree(
assert (m->id == XIM_CACHE_MAGIC);
assert (m->version == XIM_CACHE_VERSION);
if (size != m->size ||
- size < XOffsetOf (struct _XimCacheStruct, fname) + namelen + encodinglen) {
+ size < sizeof (struct _XimCacheStruct) + namelen + encodinglen) {
fprintf (stderr, "Ignoring broken XimCache %s [%s]\n", name, encoding);
munmap (m, size);
return False;
@@ -442,7 +442,7 @@ _XimWriteCachedDefaultTree(
int fd;
FILE *fp;
struct _XimCacheStruct *m;
- int msize = (XOffsetOf(struct _XimCacheStruct, fname)
+ int msize = (sizeof(struct _XimCacheStruct)
+ strlen(name) + strlen(encoding) + 2
+ XIM_CACHE_TREE_ALIGNMENT-1) & -XIM_CACHE_TREE_ALIGNMENT;
DefTreeBase *b = &im->private.local.base;
--
2.13.6