linux-dev/arch/um/Kconfig, branch master

um: Enable FORTIFY_SOURCE

2022-09-07T23:37:27Z

Enable FORTIFY_SOURCE so running Kunit tests can test fortified functions. Signed-off-by: Kees Cook Tested-by: David Gow Link: https://lore.kernel.org/r/20220210003224.773957-1-keescook@chromium.org

UML: add support for KASAN under x86_64

2022-07-17T21:35:22Z

Make KASAN run on User Mode Linux on x86_64. The UML-specific KASAN initializer uses mmap to map the ~16TB of shadow memory to the location defined by KASAN_SHADOW_OFFSET. kasan_init() utilizes constructors to initialize KASAN before main(). The location of the KASAN shadow memory, starting at KASAN_SHADOW_OFFSET, can be configured using the KASAN_SHADOW_OFFSET option. The default location of this offset is 0x100000000000, which keeps it out-of-the-way even on UML setups with more "physical" memory. For low-memory setups, 0x7fff8000 can be used instead, which fits in an immediate and is therefore faster, as suggested by Dmitry Vyukov. There is usually enough free space at this location; however, it is a config option so that it can be easily changed if needed. Note that, unlike KASAN on other architectures, vmalloc allocations still use the shadow memory allocated upfront, rather than allocating and free-ing it per-vmalloc allocation. If another architecture chooses to go down the same path, we should replace the checks for CONFIG_UML with something more generic, such as: - A CONFIG_KASAN_NO_SHADOW_ALLOC option, which architectures could set - or, a way of having architecture-specific versions of these vmalloc and module shadow memory allocation options. Also note that, while UML supports both KASAN in inline mode (CONFIG_KASAN_INLINE) and static linking (CONFIG_STATIC_LINK), it does not support both at the same time. Signed-off-by: Patricia Alfonso Co-developed-by: Vincent Whitchurch Signed-off-by: Vincent Whitchurch Signed-off-by: David Gow Reviewed-by: Johannes Berg Reviewed-by: Dmitry Vyukov Reviewed-by: Andrey Konovalov Signed-off-by: Richard Weinberger

um: Kconfig: Fix indentation

2022-07-17T21:12:03Z

The convention for indentation seems to be a single tab. Help text is further indented by an additional two whitespaces. Fix the lines that violate these rules. Signed-off-by: Juerg Haefliger Signed-off-by: Richard Weinberger

Merge tag 'for-linus-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2022-06-03T21:35:14Z

Pull UML updates from Richard Weinberger: - Various cleanups and fixes: xterm, serial line, time travel - Set ARCH_HAS_GCOV_PROFILE_ALL * tag 'for-linus-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: Fix out-of-bounds read in LDT setup um: chan_user: Fix winch_tramp() return value um: virtio_uml: Fix broken device handling in time-travel um: line: Use separate IRQs per line um: Enable ARCH_HAS_GCOV_PROFILE_ALL um: Use asm-generic/dma-mapping.h um: daemon: Make default socket configurable um: xterm: Make default terminal emulator configurable

um: Enable ARCH_HAS_GCOV_PROFILE_ALL

2022-05-27T07:01:14Z

Enable ARCH_HAS_GCOV_PROFILE_ALL so that CONFIG_GCOV_PROFILE_ALL can be selected on UML. I didn't need to explicitly disable GCOV on anything to get this to work on the configs I tested. Signed-off-by: Vincent Whitchurch Signed-off-by: Richard Weinberger

kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS

2022-05-24T07:33:20Z

include/{linux,asm-generic}/export.h defines a weak symbol, __crc_* as a placeholder. Genksyms writes the version CRCs into the linker script, which will be used for filling the __crc_* symbols. The linker script format depends on CONFIG_MODULE_REL_CRCS. If it is enabled, __crc_* holds the offset to the reference of CRC. It is time to get rid of this complexity. Now that modpost parses text files (.*.cmd) to collect all the CRCs, it can generate C code that will be linked to the vmlinux or modules. Generate a new C file, .vmlinux.export.c, which contains the CRCs of symbols exported by vmlinux. It is compiled and linked to vmlinux in scripts/link-vmlinux.sh. Put the CRCs of symbols exported by modules into the existing *.mod.c files. No additional build step is needed for modules. As before, *.mod.c are compiled and linked to *.ko in scripts/Makefile.modfinal. No linker magic is used here. The new C implementation works in the same way, whether CONFIG_RELOCATABLE is enabled or not. CONFIG_MODULE_REL_CRCS is no longer needed. Previously, Kbuild invoked additional $(LD) to update the CRCs in objects, but this step is unneeded too. Signed-off-by: Masahiro Yamada Tested-by: Nathan Chancellor Tested-by: Nicolas Schier Reviewed-by: Nicolas Schier Tested-by: Sedat Dilek # LLVM-14 (x86-64)

Merge tag 'locking_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-01-12T01:24:45Z

Pull locking updates from Borislav Petkov: "Lots of cleanups and preparation. Highlights: - futex: Cleanup and remove runtime futex_cmpxchg detection - rtmutex: Some fixes for the PREEMPT_RT locking infrastructure - kcsan: Share owner_on_cpu() between mutex,rtmutex and rwsem and annotate the racy owner->on_cpu access *once*. - atomic64: Dead-Code-Elemination" [ Description above by Peter Zijlstra ] * tag 'locking_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/atomic: atomic64: Remove unusable atomic ops futex: Fix additional regressions locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h x86/mm: Include spinlock_t definition in pgtable. locking: Mark racy reads of owner->on_cpu locking: Make owner_on_cpu() into lockdep/selftests: Adapt ww-tests for PREEMPT_RT lockdep/selftests: Skip the softirq related tests on PREEMPT_RT lockdep/selftests: Unbalanced migrate_disable() & rcu_read_lock(). lockdep/selftests: Avoid using local_lock_{acquire|release}(). lockdep: Remove softirq accounting on PREEMPT_RT. locking/rtmutex: Add rt_mutex_lock_nest_lock() and rt_mutex_lock_killable(). locking/rtmutex: Squash self-deadlock check for ww_rt_mutex. locking: Remove rt_rwlock_is_contended(). sched: Trigger warning if ->migration_disabled counter underflows. futex: Fix sparc32/m68k/nds32 build regression futex: Remove futex_cmpxchg detection futex: Ensure futex_atomic_cmpxchg_inatomic() is present kernel/locking: Use a pointer in ww_mutex_trylock().

um: Add devicetree support

2021-12-22T19:35:01Z

Add a dtb= option to boot UML with a devicetree blob. This can be used for testing driver code using UML. Signed-off-by: Vincent Whitchurch [rw: Add dependency on CONFIG_OF] Signed-off-by: Richard Weinberger

um: remove set_fs

2021-12-22T16:56:56Z

Remove address space overrides using set_fs() for User Mode Linux. Note that just like the existing kernel access case of the uaccess routines the new nofault kernel handlers do not actually have any exception handling. This is probably broken, but not change to the status quo. Signed-off-by: Christoph Hellwig Signed-off-by: Richard Weinberger

futex: Remove futex_cmpxchg detection

2021-11-24T23:02:28Z

Now that all architectures have a working futex implementation in any configuration, remove the runtime detection code. Signed-off-by: Arnd Bergmann Signed-off-by: Thomas Gleixner Reviewed-by: Russell King (Oracle) Acked-by: Vineet Gupta Acked-by: Max Filippov Acked-by: Christian Borntraeger Link: https://lore.kernel.org/r/20211026100432.1730393-2-arnd@kernel.org