Alexander Potapenko bd6f3421a5 mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush() ... commit 47ebd0310e upstream. As reported by Dipanjan Das, when KMSAN is used together with kernel fault injection (or, generally, even without the latter), calls to kcalloc() or __vmap_pages_range_noflush() may fail, leaving the metadata mappings for the virtual mapping in an inconsistent state. When these metadata mappings are accessed later, the kernel crashes. To address the problem, we return a non-zero error code from kmsan_vmap_pages_range_noflush() in the case of any allocation/mapping failure inside it, and make vmap_pages_range_noflush() return an error if KMSAN fails to allocate the metadata. This patch also removes KMSAN_WARN_ON() from vmap_pages_range_noflush(), as these allocation failures are not fatal anymore. Link: https://lkml.kernel.org/r/20230413131223.4135168-1-glider@google.com Fixes: b073d7f8ae ("mm: kmsan: maintain KMSAN metadata for page operations") Signed-off-by: Alexander Potapenko <glider@google.com> Reported-by: Dipanjan Das <mail.dipanjan.das@gmail.com> Link: https://lore.kernel.org/linux-mm/CANX2M5ZRrRA64k0hOif02TjmY9kbbO2aCBPyq79es34RXZ=cAw@mail.gmail.com/ Reviewed-by: Marco Elver <elver@google.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-04-26 14:28:41 +02:00
..
core.c	kmsan: handle task creation and exiting	2022-10-03 14:03:20 -07:00
hooks.c	mm: kmsan: handle alloc failures in kmsan_ioremap_page_range()	2023-04-26 14:28:41 +02:00
init.c	init: kmsan: call KMSAN initialization routines	2022-10-03 14:03:21 -07:00
instrumentation.c	x86: fortify: kmsan: fix KMSAN fortify builds	2022-10-28 13:37:23 -07:00
kmsan_test.c	kmsan: include linux/vmalloc.h	2023-01-04 11:28:59 +01:00
kmsan.h	kmsan: core: kmsan_in_runtime() should return true in NMI context	2022-11-08 15:57:24 -08:00
Makefile	kmsan: add tests for KMSAN	2022-10-03 14:03:22 -07:00
report.c
shadow.c	mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush()	2023-04-26 14:28:41 +02:00