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xwayland: Fix CVE-2024-31083
The patches are copied from xserver-xorg recipe. CVE reported for both and patches apply on both. Upstream-Commit: https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdca6c3d1f5057ee & https://gitlab.freedesktop.org/xorg/xserver/-/commit/337d8d48b618d4fc (From OE-Core rev: 1c4b1e7877210243707a91d6a9d37ed4546bc8a7) Signed-off-by: Vijay Anusuri <vanusuri@mvista.com> Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Vijay Anusuri
committed by
Steve Sakoman
Steve Sakoman
parent
57a80e447e
commit
46014acb66
@@ -0,0 +1,118 @@
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From bdca6c3d1f5057eeb31609b1280fc93237b00c77 Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Tue, 30 Jan 2024 13:13:35 +1000
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Subject: [PATCH] render: fix refcounting of glyphs during ProcRenderAddGlyphs
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Previously, AllocateGlyph would return a new glyph with refcount=0 and a
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re-used glyph would end up not changing the refcount at all. The
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resulting glyph_new array would thus have multiple entries pointing to
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the same non-refcounted glyphs.
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AddGlyph may free a glyph, resulting in a UAF when the same glyph
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pointer is then later used.
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Fix this by returning a refcount of 1 for a new glyph and always
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incrementing the refcount for a re-used glyph, followed by dropping that
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refcount back down again when we're done with it.
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CVE-2024-31083, ZDI-CAN-22880
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1463>
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CVE: CVE-2024-31083
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Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdca6c3d1f5057ee]
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Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
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Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
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---
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render/glyph.c | 5 +++--
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render/glyphstr.h | 2 ++
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render/render.c | 15 +++++++++++----
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3 files changed, 16 insertions(+), 6 deletions(-)
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diff --git a/render/glyph.c b/render/glyph.c
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index f3ed9cf..d5fc5f3 100644
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--- a/render/glyph.c
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+++ b/render/glyph.c
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@@ -245,10 +245,11 @@ FreeGlyphPicture(GlyphPtr glyph)
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}
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}
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-static void
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+void
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FreeGlyph(GlyphPtr glyph, int format)
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{
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CheckDuplicates(&globalGlyphs[format], "FreeGlyph");
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+ BUG_RETURN(glyph->refcnt == 0);
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if (--glyph->refcnt == 0) {
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GlyphRefPtr gr;
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int i;
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@@ -354,7 +355,7 @@ AllocateGlyph(xGlyphInfo * gi, int fdepth)
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glyph = (GlyphPtr) malloc(size);
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if (!glyph)
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return 0;
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- glyph->refcnt = 0;
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+ glyph->refcnt = 1;
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glyph->size = size + sizeof(xGlyphInfo);
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glyph->info = *gi;
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dixInitPrivates(glyph, (char *) glyph + head_size, PRIVATE_GLYPH);
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diff --git a/render/glyphstr.h b/render/glyphstr.h
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index 2f51bd2..68f8c9e 100644
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--- a/render/glyphstr.h
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+++ b/render/glyphstr.h
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@@ -117,6 +117,8 @@ extern GlyphSetPtr AllocateGlyphSet(int fdepth, PictFormatPtr format);
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extern int
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FreeGlyphSet(void *value, XID gid);
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+void FreeGlyph(GlyphPtr glyph, int format);
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+
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#define GLYPH_HAS_GLYPH_PICTURE_ACCESSOR 1 /* used for api compat */
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extern _X_EXPORT PicturePtr
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GetGlyphPicture(GlyphPtr glyph, ScreenPtr pScreen);
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diff --git a/render/render.c b/render/render.c
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index 456f156..5bc2a20 100644
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--- a/render/render.c
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+++ b/render/render.c
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@@ -1076,6 +1076,7 @@ ProcRenderAddGlyphs(ClientPtr client)
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if (glyph_new->glyph && glyph_new->glyph != DeletedGlyph) {
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glyph_new->found = TRUE;
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+ ++glyph_new->glyph->refcnt;
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}
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else {
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GlyphPtr glyph;
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@@ -1168,8 +1169,10 @@ ProcRenderAddGlyphs(ClientPtr client)
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err = BadAlloc;
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goto bail;
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}
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- for (i = 0; i < nglyphs; i++)
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+ for (i = 0; i < nglyphs; i++) {
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AddGlyph(glyphSet, glyphs[i].glyph, glyphs[i].id);
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+ FreeGlyph(glyphs[i].glyph, glyphSet->fdepth);
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+ }
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if (glyphsBase != glyphsLocal)
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free(glyphsBase);
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@@ -1179,9 +1182,13 @@ ProcRenderAddGlyphs(ClientPtr client)
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FreePicture((void *) pSrc, 0);
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if (pSrcPix)
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FreeScratchPixmapHeader(pSrcPix);
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- for (i = 0; i < nglyphs; i++)
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- if (glyphs[i].glyph && !glyphs[i].found)
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- free(glyphs[i].glyph);
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+ for (i = 0; i < nglyphs; i++) {
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+ if (glyphs[i].glyph) {
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+ --glyphs[i].glyph->refcnt;
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+ if (!glyphs[i].found)
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+ free(glyphs[i].glyph);
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+ }
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+ }
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if (glyphsBase != glyphsLocal)
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free(glyphsBase);
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return err;
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--
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2.40.0
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@@ -0,0 +1,77 @@
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From 337d8d48b618d4fc0168a7b978be4c3447650b04 Mon Sep 17 00:00:00 2001
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From: Olivier Fourdan <ofourdan@redhat.com>
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Date: Fri, 5 Apr 2024 15:24:49 +0200
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Subject: [PATCH] render: Avoid possible double-free in ProcRenderAddGlyphs()
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ProcRenderAddGlyphs() adds the glyph to the glyphset using AddGlyph() and
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then frees it using FreeGlyph() to decrease the reference count, after
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AddGlyph() has increased it.
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AddGlyph() however may chose to reuse an existing glyph if it's already
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in the glyphSet, and free the glyph that was given, in which case the
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caller function, ProcRenderAddGlyphs() will call FreeGlyph() on an
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already freed glyph, as reported by ASan:
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READ of size 4 thread T0
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#0 in FreeGlyph xserver/render/glyph.c:252
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#1 in ProcRenderAddGlyphs xserver/render/render.c:1174
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#2 in Dispatch xserver/dix/dispatch.c:546
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#3 in dix_main xserver/dix/main.c:271
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#4 in main xserver/dix/stubmain.c:34
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#5 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
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#6 in __libc_start_main_impl ../csu/libc-start.c:360
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#7 (/usr/bin/Xwayland+0x44fe4)
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Address is located 0 bytes inside of 64-byte region
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freed by thread T0 here:
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#0 in __interceptor_free libsanitizer/asan/asan_malloc_linux.cpp:52
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#1 in _dixFreeObjectWithPrivates xserver/dix/privates.c:538
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#2 in AddGlyph xserver/render/glyph.c:295
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#3 in ProcRenderAddGlyphs xserver/render/render.c:1173
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#4 in Dispatch xserver/dix/dispatch.c:546
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#5 in dix_main xserver/dix/main.c:271
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#6 in main xserver/dix/stubmain.c:34
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#7 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
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previously allocated by thread T0 here:
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#0 in __interceptor_malloc libsanitizer/asan/asan_malloc_linux.cpp:69
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#1 in AllocateGlyph xserver/render/glyph.c:355
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#2 in ProcRenderAddGlyphs xserver/render/render.c:1085
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#3 in Dispatch xserver/dix/dispatch.c:546
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#4 in dix_main xserver/dix/main.c:271
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#5 in main xserver/dix/stubmain.c:34
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#6 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
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SUMMARY: AddressSanitizer: heap-use-after-free xserver/render/glyph.c:252 in FreeGlyph
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To avoid that, make sure not to free the given glyph in AddGlyph().
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v2: Simplify the test using the boolean returned from AddGlyph() (Michel)
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v3: Simplify even more by not freeing the glyph in AddGlyph() (Peter)
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Fixes: bdca6c3d1 - render: fix refcounting of glyphs during ProcRenderAddGlyphs
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Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1659
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Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
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Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1476>
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CVE: CVE-2024-31083
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Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/xserver/-/commit/337d8d48b618d4fc]
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Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
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Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
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---
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render/glyph.c | 2 --
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1 file changed, 2 deletions(-)
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diff --git a/render/glyph.c b/render/glyph.c
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index d5fc5f3..f5069d4 100644
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--- a/render/glyph.c
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+++ b/render/glyph.c
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@@ -291,8 +291,6 @@ AddGlyph(GlyphSetPtr glyphSet, GlyphPtr glyph, Glyph id)
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gr = FindGlyphRef(&globalGlyphs[glyphSet->fdepth], signature,
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TRUE, glyph->sha1);
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if (gr->glyph && gr->glyph != DeletedGlyph && gr->glyph != glyph) {
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- FreeGlyphPicture(glyph);
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- dixFreeObjectWithPrivates(glyph, PRIVATE_GLYPH);
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glyph = gr->glyph;
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}
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else if (gr->glyph != glyph) {
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--
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2.40.0
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@@ -26,6 +26,8 @@ SRC_URI = "https://www.x.org/archive/individual/xserver/xwayland-${PV}.tar.xz \
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file://CVE-2024-21886-2.patch \
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file://CVE-2024-31080.patch \
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file://CVE-2024-31081.patch \
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file://CVE-2024-31083-0001.patch \
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file://CVE-2024-31083-0002.patch \
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"
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SRC_URI[sha256sum] = "d11eeee73290b88ea8da42a7d9350dedfaba856ce4ae44e58c045ad9ecaa2f73"
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