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When the kernel is compiled with -asan-stack=true, the address sanitizer will emit inline accesses to the shadow map. In other words, some shadow map accesses are not intercepted by the KASAN runtime, so they cannot be disabled even if the runtime is not yet initialized by kasan_init() at the end of hammer_time(). This went unnoticed because the loader will initialize all PML4 entries of the bootstrap page table to point to the same PDP page, so early shadow map accesses do not raise a page fault, though they are silently corrupting memory. In fact, when the loader does not copy the staging area, we do get a page fault since in that case only the first and last PML4Es are populated by the loader. But due to another bug, the loader always treated KASAN kernels as non-relocatable and thus always copied the staging area. It is not really practical to annotate hammer_time() and all callees with __nosanitizeaddress, so instead add some early initialization which creates a shadow for the boot stack used by hammer_time(). This is only needed by KASAN, not by KMSAN, but the shared pmap code handles both. Reported by: mhorne Reviewed by: kib MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D35449 |
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