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
Replace multiple methods of checking for functions with AC_CHECK_FUNCS
Replace multiple methods of selecting fallback funcs with AC_REPLACE_FUNCS
Replace HAS_* and NEED_* #defines with autogenerated HAVE_*
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
Linux test code fixed by: Keith Packard <keithp@keithp.com>
When an empty _SOURCES variable is declared, automake will recognize that
only linking is needed.
Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>
Tested-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Tested-by: Peter Hutterer <peter.hutterer@who-t.net>
An interface is provided for figuring out the PID and process name of
a client. Make some existing functionality from SELinux and IA
extensions available for general use.
Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Reviewed-by: Tiago Vignatti <tiago.vignatti@nokia.com>
This reverts commit 579715f830.
The patch is not needed anymore. I haven't encountered backtrace
problems with GCC 4.3.3. Even if the problems still persisted, this
commit should be removed and instead the definition of _X_NORETURN
should be modified to be empty if GCC/ARM is used. However, currently
it seems that ARM backtraces are OK even if _X_NORETURN is used and
-mapcs-frame is not defined in CFLAGS.
Signed-off-by: Rami Ylimäki <rami.ylimaki@vincit.fi>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
There are two noreturn functions in the X server: FatalError and
AbortServer. Having any of those two functions in the middle of a call
stack will prevent unwinding the program properly and stops the
backtrace at those functions in gdb.
The file containing FatalError and AbortServer, os/log.c, has to be
compiled with the -mapcs-frame option on ARM to get proper
backtraces. Automake imposes its own restrictions on compiling
individual source files with different options. The recommended way to
do this is to put os/log.c into a convenience library and add this
library inside os/libos.la. See the documentation of GNU Automake
manual, version 1.11.1, section 27.8 Per-Object Flags Emulation, for
details.
Signed-off-by: Rami Ylimaki <ext-rami.ylimaki@nokia.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Previously DLOPEN_LIBS was managed in top-level configure.ac.
Instead bundle it with the code using dl*() functions to
avoid breakages in uncommon configurations.
Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Dan Nicholson <dbn.lists@gmail.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Dan Nicholson <dbn.lists@gmail.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
Replaces special handling for Xquartz DDX and scales better to handling
the multiple platforms that now have some level of Dtrace support available.
Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
OsInitColors always just returned TRUE, so just remove calls to it and
insane special-case logic. Remove unused kcolor.c implementation, and
merge oscolor.h into oscolor.c since it was the only user. Remove
open-coded strncasecmp in oscolor.c.
Since we no longer need to call OsInitColors after reading the config
file, just call PostConfigInit() from one place, and move PM handling to
one place so we can install the signal handlers earlier.
Before you complain, this code hasn't seen material change since at least
X11R6. It certainly does not build with any modern version of Kerberos.
Anybody wanting krb5 auth to their X server should probably be using
GSSAPI instead of internal krb5 API anyway.
automake will not stop whining about the *.O files not being in normal library
name format, so just tell automake they are PROGRAMS so it builds them without
bitching.
Get rid of almost all uses of these definitions. They're still defined for
delinquent out-of-tree drivers, and also for the Mesa build. As well as
for miinitext.c. But largely gone.
