linux-toradex.git/arch/um/Kconfig.common, branch v4.9.60

Merge branch 'for-linus-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2016-08-04T23:37:59+00:00

Pull UML updates from Richard Weinberger:
 "Beside of various fixes this also contains patches to enable features
  such was Kcov, kmemleak and TRACE_IRQFLAGS_SUPPORT on UML"

* 'for-linus-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  hostfs: Freeing an ERR_PTR in hostfs_fill_sb_common()
  um: Support kcov
  um: Enable TRACE_IRQFLAGS_SUPPORT
  um: Use asm-generic/irqflags.h
  um: Fix possible deadlock in sig_handler_common()
  um: Select HAVE_DEBUG_KMEMLEAK
  um: Setup physical memory in setup_arch()
  um: Eliminate null test after alloc_bootmem

um: Support kcov

2016-08-03T22:18:06+00:00

This adds support for kcov to UML.

There is a small problem where UML will randomly segfault during boot;
this is because current_thread_info() occasionally returns an invalid
(non-NULL) pointer and we try to dereference it in
__sanitizer_cov_trace_pc(). I consider this a bug in UML itself and this
patch merely exposes it.

[v2: disable instrumentation in UML-specific code]

Cc: Quentin Casasnovas 
Cc: Richard Weinberger 
Cc: Thomas Meyer 
Cc: user-mode-linux-devel 
Cc: Dmitry Vyukov 
Signed-off-by: Vegard Nossum 
Signed-off-by: Richard Weinberger

um: Enable TRACE_IRQFLAGS_SUPPORT

2016-08-03T22:18:04+00:00

Now we have everything we need, so enable
TRACE_IRQFLAGS_SUPPORT.

Signed-off-by: Richard Weinberger

um: Select HAVE_DEBUG_KMEMLEAK

2016-08-03T22:01:10+00:00

Now we have the infrastructure to support kmemleak.
Enable the HAVE flag.

Signed-off-by: Richard Weinberger

GCC plugin infrastructure

2016-06-07T20:57:10+00:00

This patch allows to build the whole kernel with GCC plugins. It was ported from
grsecurity/PaX. The infrastructure supports building out-of-tree modules and
building in a separate directory. Cross-compilation is supported too.
Currently the x86, arm, arm64 and uml architectures enable plugins.

The directory of the gcc plugins is scripts/gcc-plugins. You can use a file or a directory
there. The plugins compile with these options:
* -fno-rtti: gcc is compiled with this option so the plugins must use it too
* -fno-exceptions: this is inherited from gcc too
* -fasynchronous-unwind-tables: this is inherited from gcc too
* -ggdb: it is useful for debugging a plugin (better backtrace on internal
errors)
* -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
* -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
variable, plugin-version.h)

The infrastructure introduces a new Makefile target called gcc-plugins. It
supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
This script also checks the availability of the included headers in
scripts/gcc-plugins/gcc-common.h.

The gcc-common.h header contains frequently included headers for GCC plugins
and it has a compatibility layer for the supported gcc versions.

The gcc-generate-*-pass.h headers automatically generate the registration
structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.

Note that 'make clean' keeps the *.so files (only the distclean or mrproper
targets clean all) because they are needed for out-of-tree modules.

Based on work created by the PaX Team.

Signed-off-by: Emese Revfy
Acked-by: Kees Cook
Signed-off-by: Michal Marek

um: Add seccomp support

2016-01-10T20:49:49+00:00

This brings SECCOMP_MODE_STRICT and SECCOMP_MODE_FILTER support through
prctl(2) and seccomp(2) to User-mode Linux for i386 and x86_64
subarchitectures.

secure_computing() is called first in handle_syscall() so that the
syscall emulation will be aborted quickly if matching a seccomp rule.

This is inspired from Meredydd Luff's patch
(https://gerrit.chromium.org/gerrit/21425).

Signed-off-by: Mickaël Salaün 
Cc: Jeff Dike 
Cc: Richard Weinberger 
Cc: Ingo Molnar 
Cc: Kees Cook 
Cc: Andy Lutomirski 
Cc: Will Drewry 
Cc: Chris Metcalf 
Cc: Michael Ellerman 
Cc: James Hogan 
Cc: Meredydd Luff 
Cc: David Drysdale 
Signed-off-by: Richard Weinberger 
Acked-by: Kees Cook

um: Skip futex_atomic_cmpxchg_inatomic() test

2015-01-04T13:20:26+00:00

futex_atomic_cmpxchg_inatomic() does not work on UML because
it triggers a copy_from_user() in kernel context.
On UML copy_from_user() can only be used if the kernel was called
by a real user space process such that UML can use ptrace()
to fetch the value.

Reported-by: Miklos Szeredi 
Suggested-by: Geert Uytterhoeven 
Signed-off-by: Richard Weinberger 
Tested-by: Daniel Walter

um: Add support for CONFIG_STACKTRACE

2014-10-13T19:46:25+00:00

Add stacktrace support for User Mode Linux

Signed-off-by: Daniel Walter 
Signed-off-by: Richard Weinberger

audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL

2014-03-20T14:11:10+00:00

Currently AUDITSYSCALL has a long list of architecture depencency:
       depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML ||
		SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ALPHA)
The purpose of this patch is to replace it with HAVE_ARCH_AUDITSYSCALL
for simplicity.

Signed-off-by: AKASHI Takahiro 
Acked-by: Will Deacon  (arm)
Acked-by: Richard Guy Briggs  (audit)
Acked-by: Matt Turner  (alpha)
Acked-by: Michael Ellerman  (powerpc)
Signed-off-by: Eric Paris

arch/um: make it work with defconfig and x86_64

2013-11-17T10:31:48+00:00

arch/um/defconfig only lists one default configuration, and that applies
only to the i386 architecture.  Replace it with two minimal
configuration files generated using `make savedefconfig`:

  i386_defconfig and x86_64_defconfig

The build scripts now require two updates:

1. um's Kconfig (arch/x86/um/Kconfig) should specify an ARCH_DEFCONFIG
   section explicitly pointing to these scripts if the required
   variables are set.  Take care to remove the DEFCONFIG_LIST section
   defined in the included file arch/um/Kconfig.common.

2. um's Makefile (arch/um/Makefile) should set KBUILD_DEFCONFIG properly
   for the top-level Makefile to pick up.  Copy the logic in
   arch/x86/Makefile to properly pick the defconfig file depending on
   the actual architecture; except we're working with $SUBARCH here,
   instead of $ARCH.

Now, you can do:

  $ ARCH=um make defconfig
  $ ARCH=um make

and successfully build User-Mode Linux on an x86_64 box in default
configuration.

Cc: Richard Weinberger 
Cc: Jeff Dike 
Signed-off-by: Ramkumar Ramachandra 
Signed-off-by: Richard Weinberger