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author | Alexander Lobakin <alobakin@pm.me> | 2021-01-10 14:21:05 +0000 |
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committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-01-13 10:59:04 +0100 |
commit | 69e976831cd53f9ba304fd20305b2025ecc78eab (patch) | |
tree | f7c79532e16b1f1dc788db4bc6b357aec781cb2c /tools/build/tests | |
parent | 698222457465ce343443be81c5512edda86e5914 (diff) | |
download | linux-69e976831cd53f9ba304fd20305b2025ecc78eab.tar.gz |
MIPS: relocatable: fix possible boot hangup with KASLR enabled
LLVM-built Linux triggered a boot hangup with KASLR enabled. arch/mips/kernel/relocate.c:get_random_boot() uses linux_banner, which is a string constant, as a random seed, but accesses it as an array of unsigned long (in rotate_xor()). When the address of linux_banner is not aligned to sizeof(long), such access emits unaligned access exception and hangs the kernel. Use PTR_ALIGN() to align input address to sizeof(long) and also align down the input length to prevent possible access-beyond-end. Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE") Cc: stable@vger.kernel.org # 4.7+ Signed-off-by: Alexander Lobakin <alobakin@pm.me> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'tools/build/tests')
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