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41da295eb5
xserver-multidpi/include
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Keith Packard 41da295eb5 Trap SIGBUS to handle truncated shared memory segments 
If a client passes a section of memory via file descriptor and then
subsequently truncates that file, the underlying pages will be freed
and the addresses invalidated. Subsequent accesses to the page will
fail with a SIGBUS error.

Trap that SIGBUS, figure out which segment was causing the error and
then allocate new pages to fill in for that region. Mark the offending
shared segment as invalid and free the resource ID so that the client
will be able to tell when subsequently attempting to use the segment.

Signed-off-by: Keith Packard <keithp@keithp.com>

v2: Use MAP_FIXED to simplify the recovery logic (Mark Kettenis)
v3: Also catch errors in ShmCreateSegment

Conflicts:
	include/dix-config.h.in
	include/xorg-config.h.in
2013-11-11 15:16:07 -08:00
..
.gitignore .gitignore: use common defaults with custom section #24239 2009-11-11 21:40:20 -08:00
busfault.h Trap SIGBUS to handle truncated shared memory segments 2013-11-11 15:16:07 -08:00
callback.h dix: delete all callbacks before reset 2013-05-08 09:27:30 +10:00
client.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
closestr.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
closure.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
colormap.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
colormapst.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
cursor.h Abstract cursor refcounting 2013-05-15 19:17:57 +10:00
cursorstr.h dix: FIXES is not optional 2013-09-10 13:28:24 -04:00
dix-config-apple-verbatim.h Move the apple fat binary hacks back to a header file, and make it apple-only. 2009-01-30 16:36:45 -08:00
dix-config.h.in Trap SIGBUS to handle truncated shared memory segments 2013-11-11 15:16:07 -08:00
dix.h sync: if the idle time was reset, force alarms to trigger (#70476) 2013-10-18 16:44:32 +10:00
dixaccess.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
dixevents.h dix: Remove redundant declarations. 2012-05-14 13:31:00 +01:00
dixfont.h dix: fix redundant redeclaration warnings in dixfont 2012-11-05 13:24:59 -06:00
dixfontstr.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
dixfontstubs.h dix: fix redundant redeclaration warnings in dixfont 2012-11-05 13:24:59 -06:00
dixgrabs.h dix: AllocGrab can copy if an argument is passed in 2013-05-10 14:32:37 +10:00
dixstruct.h Add interfaces to get FDs from clients over the socket 2013-10-31 16:58:25 -07:00
eventconvert.h input: drop FP1616 macro 2012-11-19 12:12:23 +10:00
events.h Add support for XI2.3: Pointer barrier events and releases. 2012-12-17 15:01:45 +10:00
eventstr.h Xi: use public.processInputProc to replay the touch history 2013-05-10 14:32:36 +10:00
exevents.h dix: Move DeviceFocusEvent from Xi into enterleave.c 2012-05-17 08:50:44 +10:00
extension.h Constify argument to LoadExtension 2012-11-21 11:13:55 +11:00
extinit.h present: Add Present extension 2013-10-31 16:59:18 -07:00
extnsionst.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
gc.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
gcstruct.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
globals.h Move extension initialisation prototypes into extinit.h 2012-07-09 23:06:41 -07:00
glx_extinit.h glx: drop GLX_LIBS from X server and workaround sdksyms. 2012-07-25 23:30:53 -07:00
hotplug.h xf86: don't hotplug output devices while VT switched. 2013-04-12 10:01:23 +10:00
input.h include: change grabtypes to start at 1 2013-10-14 11:07:37 +10:00
inputstr.h include: wrap EMASKSIZE in parentheses 2013-08-30 14:26:55 +10:00
inpututils.h dix: split xi2_mask_isset into a per-device function 2012-12-12 17:25:16 +10:00
kdrive-config.h.in kdrive: Add option to compile out input drivers 2010-01-06 19:47:53 +06:00
list.h list: Avoid using X types 2013-09-10 13:28:24 -04:00
Makefile.am Trap SIGBUS to handle truncated shared memory segments 2013-11-11 15:16:07 -08:00
misc.h Add swapll to byte swap 64-bit datatypes 2013-10-31 16:58:18 -07:00
miscstruct.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
opaque.h os: Add -displayfd option 2012-05-01 11:36:30 +10:00
optionstr.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
os.h Add support for MIT-SHM AttachFd request 2013-10-31 16:58:28 -07:00
pixmap.h dix/pixmap: track dirty pixmaps in server. (v4) 2012-07-07 10:37:11 +01:00
pixmapstr.h dix/pixmap: track dirty pixmaps in server. (v4) 2012-07-07 10:37:11 +01:00
privates.h dbe: Fold the window private private into the window private 2013-09-10 13:28:24 -04:00
property.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
propertyst.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
protocol-versions.h Xext: Enable MIT-SHM FD-passing request definitions only when possible 2013-11-11 15:12:50 -08:00
ptrveloc.h dix: indentation fixes for pointer acceleration 2012-05-16 10:59:35 +10:00
region.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
regionstr.h Add a RegionDuplicate function 2013-10-31 16:58:16 -07:00
registry.h dix: add missing dixFreeRegistry define 2013-06-06 08:12:38 +10:00
resource.h xserver: Remove duplicate declaration in resource.h 2012-05-14 13:17:08 +01:00
rgb.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
screenint.h dix: don't use "new" as a parameter name 2012-07-25 09:27:11 -07:00
scrnintstr.h dix/randr: add a hook into screen to replace scanout pixmap 2012-07-07 10:39:09 +01:00
selection.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
servermd.h ARM64: Add support for aarch64 2013-11-06 16:41:49 -08:00
site.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
swaprep.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
swapreq.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
validate.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
version-config.h.in Move VENDOR_* defines from AC_SUBST to a header to avoid angering shave. 2009-04-14 10:35:44 -04:00
window.h dix: Remove MapUnmapEventsEnabled and friends 2012-09-23 10:41:54 -07:00
windowstr.h dix: Fix types in WindowOptRec 2012-09-20 14:40:18 -04:00
XIstubs.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
xkb-config.h.in Move to autoconf standard function name checks & defines 2011-12-05 14:32:45 -08:00
xkbfile.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
xkbrules.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
xkbsrv.h xkb: free XkbRulesUsed and XkbRulesDflt on extension cleanup 2013-05-07 09:40:51 +10:00
xkbstr.h Introduce a consistent coding style 2012-03-21 13:54:42 -07:00
xorg-config.h.in Remove dix-config.h config variables from xorg-config.h 2013-11-11 15:11:52 -08:00
xorg-server.h.in Make XTrans FD passing support optional. Define only on Linux 2013-11-11 15:11:39 -08:00
Xprintf.h os/xprintf: add Xvscnprintf and Xscnprintf 2012-05-03 14:59:23 +10:00
xserver-properties.h Add missing labels for multitouch valuators 2012-10-30 15:11:10 +10:00
xsha1.h Move SHA1 computation from render/glyph.c to os/ 2009-10-15 01:17:44 +02:00
xwin-config.h.in include: Add RELOCATE_PROJECTROOT to xwin-config.h header 2013-01-16 16:48:34 +00:00