kernel/drivers/misc/lkdtm/core.c, branch linux-6.2.y

lkdtm: Move crashtype definitions into each category

2022-04-12T23:16:48Z

It's long been annoying that to add a new LKDTM test one had to update lkdtm.h and core.c to get it "registered". Switch to a per-category list and update the crashtype walking code in core.c to handle it. This also means that all the lkdtm_* tests themselves can be static now. Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Signed-off-by: Kees Cook

lkdtm: Add a test for function descriptors protection

2022-02-16T12:25:12Z

Add WRITE_OPD to check that you can't modify function descriptors. Gives the following result when function descriptors are not protected: lkdtm: Performing direct entry WRITE_OPD lkdtm: attempting bad 16 bytes write at c00000000269b358 lkdtm: FAIL: survived bad write lkdtm: do_nothing was hijacked! Looks like a standard compiler barrier() is not enough to force GCC to use the modified function descriptor. Had to add a fake empty inline assembly to force GCC to reload the function descriptor. Signed-off-by: Christophe Leroy Acked-by: Kees Cook Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/7eeba50d16a35e9d799820e43304150225f20197.1644928018.git.christophe.leroy@csgroup.eu

Merge tag 'char-misc-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2022-01-14T15:02:28Z

Pull char/misc and other driver updates from Greg KH: "Here is the large set of char, misc, and other "small" driver subsystem changes for 5.17-rc1. Lots of different things are in here for char/misc drivers such as: - habanalabs driver updates - mei driver updates - lkdtm driver updates - vmw_vmci driver updates - android binder driver updates - other small char/misc driver updates Also smaller driver subsystems have also been updated, including: - fpga subsystem updates - iio subsystem updates - soundwire subsystem updates - extcon subsystem updates - gnss subsystem updates - phy subsystem updates - coresight subsystem updates - firmware subsystem updates - comedi subsystem updates - mhi subsystem updates - speakup subsystem updates - rapidio subsystem updates - spmi subsystem updates - virtual driver updates - counter subsystem updates Too many individual changes to summarize, the shortlog contains the full details. All of these have been in linux-next for a while with no reported issues" * tag 'char-misc-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (406 commits) counter: 104-quad-8: Fix use-after-free by quad8_irq_handler dt-bindings: mux: Document mux-states property dt-bindings: ti-serdes-mux: Add defines for J721S2 SoC counter: remove old and now unused registration API counter: ti-eqep: Convert to new counter registration counter: stm32-lptimer-cnt: Convert to new counter registration counter: stm32-timer-cnt: Convert to new counter registration counter: microchip-tcb-capture: Convert to new counter registration counter: ftm-quaddec: Convert to new counter registration counter: intel-qep: Convert to new counter registration counter: interrupt-cnt: Convert to new counter registration counter: 104-quad-8: Convert to new counter registration counter: Update documentation for new counter registration functions counter: Provide alternative counter registration functions counter: stm32-timer-cnt: Convert to counter_priv() wrapper counter: stm32-lptimer-cnt: Convert to counter_priv() wrapper counter: ti-eqep: Convert to counter_priv() wrapper counter: ftm-quaddec: Convert to counter_priv() wrapper counter: intel-qep: Convert to counter_priv() wrapper counter: microchip-tcb-capture: Convert to counter_priv() wrapper ...

lkdtm: Note that lkdtm_kernel_info should be removed in the future

2021-12-16T23:54:36Z

As per Linus's request, remove lkdtm_kernel_info once sufficient reporting exists in CI systems: https://lore.kernel.org/lkml/CAHk-=wiFvfkoFixTapvvyPMN9pq5G-+Dys2eSyBa1vzDGAO5+A@mail.gmail.com Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Signed-off-by: Kees Cook

powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU

2021-12-09T11:41:13Z

Compiling out hash support code when CONFIG_PPC_64S_HASH_MMU=n saves 128kB kernel image size (90kB text) on powernv_defconfig minus KVM, 350kB on pseries_defconfig minus KVM, 40kB on a tiny config. Signed-off-by: Nicholas Piggin [mpe: Fixup defined(ARCH_HAS_MEMREMAP_COMPAT_ALIGN), which needs CONFIG. Fix radix_enabled() use in setup_initial_memory_limit(). Add some stubs to reduce number of ifdefs.] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211201144153.2456614-18-npiggin@gmail.com

lkdtm/bugs: Check that a per-task stack canary exists

2021-10-25T07:13:46Z

Introduce REPORT_STACK_CANARY to check for differing stack canaries between two processes (i.e. that an architecture is correctly implementing per-task stack canaries), using the task_struct canary as the hint to locate in the stack. Requires that one of the processes being tested not be pid 1. Cc: Ard Biesheuvel Cc: Greg Kroah-Hartman Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20211022223826.330653-3-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman

lkdtm: Use init_uts_ns.name instead of macros

2021-09-10T15:09:40Z

Using generated/compile.h triggered a full LKDTM rebuild with every build. Avoid this by using the exported strings instead. Fixes: b8661450bc7f ("lkdtm: Add kernel version to failure hints") Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210901233406.2571643-1-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman

lkdtm: remove IDE_CORE_CP crashpoint

2021-08-19T05:40:22Z

With the removal of the legacy IDE driver in kb7fb14d3ac63 ("ide: remove the legacy ide driver"), this crashpoint no longer points to a valid function. Acked-by: Kees Cook Signed-off-by: Kevin Mitchell Link: https://lore.kernel.org/r/20210819022940.561875-3-kevmitch@arista.com Signed-off-by: Greg Kroah-Hartman

lkdtm: replace SCSI_DISPATCH_CMD with SCSI_QUEUE_RQ

2021-08-19T05:40:22Z

When scsi_dispatch_cmd was moved to scsi_lib.c and made static, some compilers (i.e., at least gcc 8.4.0) decided to compile this inline. This is a problem for lkdtm.ko, which inserted a kprobe on this function for the SCSI_DISPATCH_CMD crashpoint. Move this crashpoint one function up the call chain to scsi_queue_rq. Though this is also a static function, it should never be inlined because it is assigned as a structure entry. Therefore, kprobe_register should always be able to find it. Fixes: 82042a2cdb55 ("scsi: move scsi_dispatch_cmd to scsi_lib.c") Acked-by: Kees Cook Signed-off-by: Kevin Mitchell Link: https://lore.kernel.org/r/20210819022940.561875-2-kevmitch@arista.com Signed-off-by: Greg Kroah-Hartman

lkdtm/fortify: Consolidate FORTIFY_SOURCE tests

2021-08-18T20:28:51Z

The FORTIFY_SOURCE tests were split between bugs.c and fortify.c. Move tests into fortify.c, standardize their naming, add CONFIG hints, and add them to the lkdtm selftests. Cc: Arnd Bergmann Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210818174855.2307828-3-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman