#include #include #include #include #include "slab.h" #include void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node) { struct page *shadow; int pages; int i; pages = 1 << order; /* * With kmemcheck enabled, we need to allocate a memory area for the * shadow bits as well. */ shadow = alloc_pages_node(node, flags | __GFP_NOTRACK, order); if (!shadow) { if (printk_ratelimit()) pr_err("kmemcheck: failed to allocate shadow bitmap\n"); return; } for(i = 0; i < pages; ++i) page[i].shadow = page_address(&shadow[i]); /* * Mark it as non-present for the MMU so that our accesses to * this memory will trigger a page fault and let us analyze * the memory accesses. */ kmemcheck_hide_pages(page, pages); } void kmemcheck_free_shadow(struct page *page, int order) { struct page *shadow; int pages; int i; if (!kmemcheck_page_is_tracked(page)) return; pages = 1 << order; kmemcheck_show_pages(page, pages); shadow = virt_to_page(page[0].shadow); for(i = 0; i < pages; ++i) page[i].shadow = NULL; __free_pages(shadow, order); } void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object, size_t size) { if (unlikely(!object)) /* Skip object if allocation failed */ return; /* * Has already been memset(), which initializes the shadow for us * as well. */ if (gfpflags & __GFP_ZERO) return; /* No need to initialize the shadow of a non-tracked slab. */ if (s->flags & SLAB_NOTRACK) return; if (!kmemcheck_enabled || gfpflags & __GFP_NOTRACK) { /* * Allow notracked objects to be allocated from * tracked caches. Note however that these objects * will still get page faults on access, they just * won't ever be flagged as uninitialized. If page * faults are not acceptable, the slab cache itself * should be marked NOTRACK. */ kmemcheck_mark_initialized(object, size); } else if (!s->ctor) { /* * New objects should be marked uninitialized before * they're returned to the called. */ kmemcheck_mark_uninitialized(object, size); } } void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size) { /* TODO: RCU freeing is unsupported for now; hide false positives. */ if (!s->ctor && !(s->flags & SLAB_DESTROY_BY_RCU)) kmemcheck_mark_freed(object, size); } void kmemcheck_pagealloc_alloc(struct page *page, unsigned int order, gfp_t gfpflags) { int pages; if (gfpflags & (__GFP_HIGHMEM | __GFP_NOTRACK)) return; pages = 1 << order; /* * NOTE: We choose to track GFP_ZERO pages too; in fact, they * can become uninitialized by copying uninitialized memory * into them. */ /* XXX: Can use zone->node for node? */ kmemcheck_alloc_shadow(page, order, gfpflags, -1); if (gfpflags & __GFP_ZERO) kmemcheck_mark_initialized_pages(page, pages); else kmemcheck_mark_uninitialized_pages(page, pages); } ds-private-remove&id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>root/sound/soc/ux500/Kconfig
diff options
context:
space:
mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /sound/soc/ux500/Kconfig
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/soc/ux500/Kconfig')