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linux/arch/x86/lib
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Mikulas Patocka a6823e4e36 x86: __memcpy_flushcache: fix wrong alignment if size > 2^32 
The first "if" condition in __memcpy_flushcache is supposed to align the
"dest" variable to 8 bytes and copy data up to this alignment.  However,
this condition may misbehave if "size" is greater than 4GiB.

The statement min_t(unsigned, size, ALIGN(dest, 8) - dest); casts both
arguments to unsigned int and selects the smaller one.  However, the
cast truncates high bits in "size" and it results in misbehavior.

For example:

	suppose that size == 0x100000001, dest == 0x200000002
	min_t(unsigned, size, ALIGN(dest, 8) - dest) == min_t(0x1, 0xe) == 0x1;
	...
	dest += 0x1;

so we copy just one byte "and" dest remains unaligned.

This patch fixes the bug by replacing unsigned with size_t.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-04-20 11:38:49 -07:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
atomic64_32.c
atomic64_386_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
atomic64_cx8_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
cache-smp.c smp: Remove smp_call_function() and on_each_cpu() return values 2019-06-23 14:26:26 +02:00
checksum_32.S x86/checksum_32: Remove .fixup usage 2021-12-11 09:09:49 +01:00
clear_page_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
cmdline.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cmpxchg8b_emu.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
cmpxchg16b_emu.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
copy_mc_64.S x86/copy_mc_64: Remove .fixup usage 2021-12-11 09:09:46 +01:00
copy_mc.c x86, libnvdimm/test: Remove COPY_MC_TEST 2020-10-26 18:08:35 +01:00
copy_page_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
copy_user_64.S - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
cpu.c x86/lib/cpu: Address missing prototypes warning 2019-08-08 08:25:53 +02:00
csum-copy_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
csum-partial_64.c uml/x86: use x86 load_unaligned_zeropad() 2022-01-30 21:26:39 -05:00
csum-wrappers_64.c amd64: switch csum_partial_copy_generic() to new calling conventions 2020-08-20 15:45:22 -04:00
delay.c x86/delay: Introduce TPAUSE delay 2020-05-07 16:06:20 +02:00
error-inject.c x86/ibt: Annotate text references 2022-03-15 10:32:40 +01:00
getuser.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
hweight.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
inat.c x86/insn: Add a __ignore_sync_check__ marker 2021-03-15 11:00:57 +01:00
insn-eval.c - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
insn.c x86/insn: Use get_unaligned() instead of memcpy() 2021-10-06 11:56:37 +02:00
iomap_copy_64.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
iomem.c x86/sev: Unroll string mmio with CC_ATTR_GUEST_UNROLL_STRING_IO 2022-03-29 15:59:16 +02:00
kaslr.c x86/boot: Allow a "silent" kaslr random byte fetch 2021-10-27 11:07:58 +02:00
Makefile x86/mmx_32: Remove X86_USE_3DNOW 2021-12-11 09:09:45 +01:00
memcpy_32.c fortify: Detect struct member overflows in memmove() at compile-time 2022-02-13 16:50:06 -08:00
memcpy_64.S x86: clean up symbol aliasing 2022-02-22 16:21:34 +00:00
memmove_64.S x86: clean up symbol aliasing 2022-02-22 16:21:34 +00:00
memset_64.S x86: clean up symbol aliasing 2022-02-22 16:21:34 +00:00
misc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmx_32.c x86/mmx_32: Remove X86_USE_3DNOW 2021-12-11 09:09:45 +01:00
msr-reg-export.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
msr-reg.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
msr-smp.c x86/msr: Fix wr/rdmsr_safe_regs_on_cpu() prototypes 2021-03-22 21:37:03 +01:00
msr.c x86/msr: Make locally used functions static 2021-04-08 11:57:40 +02:00
pc-conf-reg.c x86: Add support for 0x22/0x23 port I/O configuration space 2021-08-10 23:31:43 +02:00
putuser.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
retpoline.S x86/ibt: Annotate text references 2022-03-15 10:32:40 +01:00
string_32.c lib/string: Move helper functions out of string.c 2021-09-25 08:20:49 -07:00
strstr_32.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
usercopy_32.c x86/usercopy: Remove .fixup usage 2021-12-11 09:09:50 +01:00
usercopy_64.c x86: __memcpy_flushcache: fix wrong alignment if size > 2^32 2022-04-20 11:38:49 -07:00
usercopy.c x86: remove __range_not_ok() 2022-02-25 09:36:05 +01:00
x86-opcode-map.txt x86/insn: Add AVX512-FP16 instructions to the x86 instruction decoder 2022-01-23 20:38:01 +01:00