Revision 9cc6d9e5daaa147a9a3e31557efcb331989e77be authored by Nathan Lynch on 29 September 2014, 18:11:36 UTC, committed by Russell King on 30 September 2014, 15:55:23 UTC
Joachim Eastwood reports that commit fbfb872f5f41 "ARM: 8148/1: flush TLS and thumbee register state during exec" causes a boot-time crash on a Cortex-M4 nommu system: Freeing unused kernel memory: 68K (281e5000 - 281f6000) Unhandled exception: IPSR = 00000005 LR = fffffff1 CPU: 0 PID: 1 Comm: swapper Not tainted 3.17.0-rc6-00313-gd2205fa30aa7 #191 task: 29834000 ti: 29832000 task.ti: 29832000 PC is at flush_thread+0x2e/0x40 LR is at flush_thread+0x21/0x40 pc : [<2800954a>] lr : [<2800953d>] psr: 4100000b sp : 29833d60 ip : 00000000 fp : 00000001 r10: 00003cf8 r9 : 29b1f000 r8 : 00000000 r7 : 29b0bc00 r6 : 29834000 r5 : 29832000 r4 : 29832000 r3 : ffff0ff0 r2 : 29832000 r1 : 00000000 r0 : 282121f0 xPSR: 4100000b CPU: 0 PID: 1 Comm: swapper Not tainted 3.17.0-rc6-00313-gd2205fa30aa7 #191 [<2800afa5>] (unwind_backtrace) from [<2800a327>] (show_stack+0xb/0xc) [<2800a327>] (show_stack) from [<2800a963>] (__invalid_entry+0x4b/0x4c) The problem is that set_tls is attempting to clear the TLS location in the kernel-user helper page, which isn't set up on V7M. Fix this by guarding the write to the kuser helper page with a CONFIG_KUSER_HELPERS ifdef. Fixes: fbfb872f5f41 ARM: 8148/1: flush TLS and thumbee register state during exec Reported-by: Joachim Eastwood <manabian@gmail.com> Tested-by: Joachim Eastwood <manabian@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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mono.txt
Mono(tm) Binary Kernel Support for Linux
-----------------------------------------
To configure Linux to automatically execute Mono-based .NET binaries
(in the form of .exe files) without the need to use the mono CLR
wrapper, you can use the BINFMT_MISC kernel support.
This will allow you to execute Mono-based .NET binaries just like any
other program after you have done the following:
1) You MUST FIRST install the Mono CLR support, either by downloading
a binary package, a source tarball or by installing from CVS. Binary
packages for several distributions can be found at:
http://go-mono.com/download.html
Instructions for compiling Mono can be found at:
http://www.go-mono.com/compiling.html
Once the Mono CLR support has been installed, just check that
/usr/bin/mono (which could be located elsewhere, for example
/usr/local/bin/mono) is working.
2) You have to compile BINFMT_MISC either as a module or into
the kernel (CONFIG_BINFMT_MISC) and set it up properly.
If you choose to compile it as a module, you will have
to insert it manually with modprobe/insmod, as kmod
cannot be easily supported with binfmt_misc.
Read the file 'binfmt_misc.txt' in this directory to know
more about the configuration process.
3) Add the following entries to /etc/rc.local or similar script
to be run at system startup:
# Insert BINFMT_MISC module into the kernel
if [ ! -e /proc/sys/fs/binfmt_misc/register ]; then
/sbin/modprobe binfmt_misc
# Some distributions, like Fedora Core, perform
# the following command automatically when the
# binfmt_misc module is loaded into the kernel
# or during normal boot up (systemd-based systems).
# Thus, it is possible that the following line
# is not needed at all.
mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
fi
# Register support for .NET CLR binaries
if [ -e /proc/sys/fs/binfmt_misc/register ]; then
# Replace /usr/bin/mono with the correct pathname to
# the Mono CLR runtime (usually /usr/local/bin/mono
# when compiling from sources or CVS).
echo ':CLR:M::MZ::/usr/bin/mono:' > /proc/sys/fs/binfmt_misc/register
else
echo "No binfmt_misc support"
exit 1
fi
4) Check that .exe binaries can be ran without the need of a
wrapper script, simply by launching the .exe file directly
from a command prompt, for example:
/usr/bin/xsd.exe
NOTE: If this fails with a permission denied error, check
that the .exe file has execute permissions.
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