Changes in Makefile

e75a6988 - kmsan: disable ftrace in kmsan core code

Wed, 15 Feb 2023 13:00:57 +0000

kmsan: disable ftrace in kmsan core codeobjtool warns about some suspicous code inside of kmsan:vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_n+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_n+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_1+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_1+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_2+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_2+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_4+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_4+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_8+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_8+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_instrument_asm_store+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_chain_origin+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_poison_alloca+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_warning+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: __msan_get_context_state+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: kmsan_copy_to_user+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: kmsan_unpoison_memory+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: kmsan_unpoison_entry_regs+0x4: call to __fentry__() with UACCESS enabledvmlinux.o: warning: objtool: kmsan_report+0x4: call to __fentry__() with UACCESS enabledThe Makefile contained a line to turn off ftrace for the entire directory,but this does not work. Replace it with individual lines, matching theapproach in kasan.Link: https://lkml.kernel.org/r/20230215130058.3836177-3-arnd@kernel.orgSigned-off-by: Arnd Bergmann Fixes: f80be4571b19 ("kmsan: add KMSAN runtime core")Acked-by: Alexander Potapenko Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Josh Poimboeuf Cc: Kuan-Ying Lee Cc: Marco Elver Cc: Peter Zijlstra (Intel) Cc: Vincenzo Frascino Signed-off-by: Andrew Morton List of files: /linux-6.15/mm/kmsan/Makefile

8ed691b0 - kmsan: add tests for KMSAN

Thu, 15 Sep 2022 15:03:58 +0000

kmsan: add tests for KMSANThe testing module triggers KMSAN warnings in different cases and checksthat the errors are properly reported, using console probes to capture thetool's output.Link: https://lkml.kernel.org/r/20220915150417.722975-25-glider@google.comSigned-off-by: Alexander Potapenko Cc: Alexander Viro Cc: Alexei Starovoitov Cc: Andrey Konovalov Cc: Andrey Konovalov Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Christoph Hellwig Cc: Christoph Lameter Cc: David Rientjes Cc: Dmitry Vyukov Cc: Eric Biggers Cc: Eric Biggers Cc: Eric Dumazet Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Ilya Leoshkevich Cc: Ingo Molnar Cc: Jens Axboe Cc: Joonsoo Kim Cc: Kees Cook Cc: Marco Elver Cc: Mark Rutland Cc: Matthew Wilcox Cc: Michael S. Tsirkin Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Petr Mladek Cc: Stephen Rothwell Cc: Steven Rostedt Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vegard Nossum Cc: Vlastimil Babka Signed-off-by: Andrew Morton List of files: /linux-6.15/mm/kmsan/Makefile

3c206509 - init: kmsan: call KMSAN initialization routines

Thu, 15 Sep 2022 15:03:51 +0000

init: kmsan: call KMSAN initialization routineskmsan_init_shadow() scans the mappings created at boot time and createsmetadata pages for those mappings.When the memblock allocator returns pages to pagealloc, we reserve 2/3 ofthose pages and use them as metadata for the remaining 1/3. Once KMSANstarts, every page allocated by pagealloc has its associated shadow andorigin pages.kmsan_initialize() initializes the bookkeeping for init_task and enablesKMSAN.Link: https://lkml.kernel.org/r/20220915150417.722975-18-glider@google.comSigned-off-by: Alexander Potapenko Cc: Alexander Viro Cc: Alexei Starovoitov Cc: Andrey Konovalov Cc: Andrey Konovalov Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Christoph Hellwig Cc: Christoph Lameter Cc: David Rientjes Cc: Dmitry Vyukov Cc: Eric Biggers Cc: Eric Biggers Cc: Eric Dumazet Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Ilya Leoshkevich Cc: Ingo Molnar Cc: Jens Axboe Cc: Joonsoo Kim Cc: Kees Cook Cc: Marco Elver Cc: Mark Rutland Cc: Matthew Wilcox Cc: Michael S. Tsirkin Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Petr Mladek Cc: Stephen Rothwell Cc: Steven Rostedt Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vegard Nossum Cc: Vlastimil Babka Signed-off-by: Andrew Morton List of files: /linux-6.15/mm/kmsan/Makefile

f80be457 - kmsan: add KMSAN runtime core

Thu, 15 Sep 2022 15:03:45 +0000

kmsan: add KMSAN runtime coreFor each memory location KernelMemorySanitizer maintains two types ofmetadata:1. The so-called shadow of that location - а byte:byte mapping describing whether or not individual bits of memory are initialized (shadow is 0) or not (shadow is 1).2. The origins of that location - а 4-byte:4-byte mapping containing 4-byte IDs of the stack traces where uninitialized values were created.Each struct page now contains pointers to two struct pages holding KMSANmetadata (shadow and origins) for the original struct page. Utilityroutines in mm/kmsan/core.c and mm/kmsan/shadow.c handle the metadatacreation, addressing, copying and checking. mm/kmsan/report.c performserror reporting in the cases an uninitialized value is used in a way thatleads to undefined behavior.KMSAN compiler instrumentation is responsible for tracking the metadataalong with the kernel memory. mm/kmsan/instrumentation.c provides theimplementation for instrumentation hooks that are called from filescompiled with -fsanitize=kernel-memory.To aid parameter passing (also done at instrumentation level), eachtask_struct now contains a struct kmsan_task_state used to track themetadata of function parameters and return values for that task.Finally, this patch provides CONFIG_KMSAN that enables KMSAN, and declaresCFLAGS_KMSAN, which are applied to files compiled with KMSAN. TheKMSAN_SANITIZE:=n Makefile directive can be used to completely disableKMSAN instrumentation for certain files.Similarly, KMSAN_ENABLE_CHECKS:=n disables KMSAN checks and makes newlycreated stack memory initialized.Users can also use functions from include/linux/kmsan-checks.h to markcertain memory regions as uninitialized or initialized (this is called"poisoning" and "unpoisoning") or check that a particular region isinitialized.Link: https://lkml.kernel.org/r/20220915150417.722975-12-glider@google.comSigned-off-by: Alexander Potapenko Acked-by: Marco Elver Cc: Alexander Viro Cc: Alexei Starovoitov Cc: Andrey Konovalov Cc: Andrey Konovalov Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Christoph Hellwig Cc: Christoph Lameter Cc: David Rientjes Cc: Dmitry Vyukov Cc: Eric Biggers Cc: Eric Biggers Cc: Eric Dumazet Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Ilya Leoshkevich Cc: Ingo Molnar Cc: Jens Axboe Cc: Joonsoo Kim Cc: Kees Cook Cc: Mark Rutland Cc: Matthew Wilcox Cc: Michael S. Tsirkin Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Petr Mladek Cc: Stephen Rothwell Cc: Steven Rostedt Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vegard Nossum Cc: Vlastimil Babka Signed-off-by: Andrew Morton List of files: /linux-6.15/mm/kmsan/Makefile