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ProcPutImage() calculates a length field from a width, left pad and depth
specified by the client (if the specified format is XYPixmap).
The calculations for the total amount of memory the server needs for the
pixmap can overflow a 32-bit number, causing out-of-bounds memory writes
on 32-bit systems (since the length is stored in a long int variable).
v2: backport to nx-libs 3.6.x (Mike DePaulo)
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Conflicts:
dix/dispatch.c
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xorg/Xserver http://lists.x.org/archives/xorg-announce/2013-October/002332.html
Save a pointer to the passed in closure structure before copying it
and overwriting the *c pointer to point to our copy instead of the
original. If we hit an error, once we free(c), reset c to point to
the original structure before jumping to the cleanup code that
references *c.
Since one of the errors being checked for is whether the server was
able to malloc(c->nChars * itemSize), the client can potentially pass
a number of characters chosen to cause the malloc to fail and the
error path to be taken, resulting in the read from freed memory.
Since the memory is accessed almost immediately afterwards, and the
X server is mostly single threaded, the odds of the free memory having
invalid contents are low with most malloc implementations when not using
memory debugging features, but some allocators will definitely overwrite
the memory there, leading to a likely crash.
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(990_fix-DEBUG-and-TEST-builds.full.patch).
(1) In nx-X11/programs/Xserver/dix:
Fix several compile errors when specifying -DDEBUG globally. Previous GCC
versions were more liberal and the code thus compiled.
Also initialize/reset a count variable correctly.
(2) In nx-X11/programs/Xserver/hw/nxagent/Render.c:
Check for pSrc->pDrawable to exist instead of having nxagent segfault when
it does not.
This enables the possibility of compiling all nxagent modules in TEST mode.
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Summary: Imported nx-X11-3.1.0-4.tar.gz
Keywords:
Imported nx-X11-3.1.0-4.tar.gz
into Git repository
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Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:
Imported nx-X11-3.1.0-1.tar.gz
into Git repository
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