Borislav Petkov 3357b8a431 x86/insn: Use get_unaligned() instead of memcpy() ... [ Upstream commit f96b467583 ] Use get_unaligned() instead of memcpy() to access potentially unaligned memory, which, when accessed through a pointer, leads to undefined behavior. get_unaligned() describes much better what is happening there anyway even if memcpy() does the job. In addition, since perf tool builds with -Werror, it would fire with: util/intel-pt-decoder/../../../arch/x86/lib/insn.c: In function '__insn_get_emulate_prefix': tools/include/../include/asm-generic/unaligned.h:10:15: error: packed attribute is unnecessary [-Werror=packed] 10 | const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \ because -Werror=packed would complain if the packed attribute would have no effect on the layout of the structure. In this case, that is intentional so disable the warning only for that compilation unit. That part is Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> No functional changes. Fixes: 5ba1071f75 ("x86/insn, tools/x86: Fix undefined behavior due to potential unaligned accesses") Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> Link: https://lkml.kernel.org/r/YVSsIkj9Z29TyUjE@zn.tnic Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-11-18 19:16:30 +01:00
..
bitops	tools: sync lib/find_bit implementation	2021-05-06 19:24:12 -07:00
atomic-gcc.h
barrier.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
bitops.h	xarray: Add XArray marks	2018-10-21 10:45:57 -04:00
bitsperlong.h	tools: sync small_const_nbits() macro with the kernel	2021-05-06 19:24:12 -07:00
hugetlb_encode.h	tools/headers: sync headers of asm-generic/hugetlb_encode.h	2021-04-20 04:18:51 -04:00
unaligned.h	x86/insn: Use get_unaligned() instead of memcpy()	2021-11-18 19:16:30 +01:00