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x86,kcfi: Fix EXPORT_SYMBOL vs kCFI

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The expectation is that all EXPORT'ed symbols are free to have their
address taken and called indirectly. The majority of the assembly
defined functions currently violate this expectation.

Make then all use SYM_TYPED_FUNC_START() in order to emit the proper
kCFI preamble.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20250207122546.302679189@infradead.org
This commit is contained in:
Peter Zijlstra 2025-02-07 13:15:32 +01:00
parent 72e213a7cc
commit 2981557cb0
11 changed files with 32 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/crypto/camellia-aesni-avx-asm_64.S
View File

@ -16,6 +16,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h>
#define CAMELLIA_TABLE_BYTE_LEN 272
@ -882,7 +883,7 @@ SYM_FUNC_START_LOCAL(__camellia_dec_blk16)
jmp .Ldec_max24;
SYM_FUNC_END(__camellia_dec_blk16)
SYM_FUNC_START(camellia_ecb_enc_16way)
SYM_TYPED_FUNC_START(camellia_ecb_enc_16way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst (16 blocks)
@ -907,7 +908,7 @@ SYM_FUNC_START(camellia_ecb_enc_16way)
RET;
SYM_FUNC_END(camellia_ecb_enc_16way)
SYM_FUNC_START(camellia_ecb_dec_16way)
SYM_TYPED_FUNC_START(camellia_ecb_dec_16way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst (16 blocks)
@ -937,7 +938,7 @@ SYM_FUNC_START(camellia_ecb_dec_16way)
RET;
SYM_FUNC_END(camellia_ecb_dec_16way)
SYM_FUNC_START(camellia_cbc_dec_16way)
SYM_TYPED_FUNC_START(camellia_cbc_dec_16way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst (16 blocks)

1
arch/x86/crypto/camellia-aesni-avx2-asm_64.S
View File

@ -6,6 +6,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h>
#define CAMELLIA_TABLE_BYTE_LEN 272

9
arch/x86/crypto/camellia-x86_64-asm_64.S
View File

@ -6,6 +6,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
.file "camellia-x86_64-asm_64.S"
.text
@ -177,7 +178,7 @@
bswapq RAB0; \
movq RAB0, 4*2(RIO);
SYM_FUNC_START(__camellia_enc_blk)
SYM_TYPED_FUNC_START(__camellia_enc_blk)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -224,7 +225,7 @@ SYM_FUNC_START(__camellia_enc_blk)
RET;
SYM_FUNC_END(__camellia_enc_blk)
SYM_FUNC_START(camellia_dec_blk)
SYM_TYPED_FUNC_START(camellia_dec_blk)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -411,7 +412,7 @@ SYM_FUNC_END(camellia_dec_blk)
bswapq RAB1; \
movq RAB1, 12*2(RIO);
SYM_FUNC_START(__camellia_enc_blk_2way)
SYM_TYPED_FUNC_START(__camellia_enc_blk_2way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -460,7 +461,7 @@ SYM_FUNC_START(__camellia_enc_blk_2way)
RET;
SYM_FUNC_END(__camellia_enc_blk_2way)
SYM_FUNC_START(camellia_dec_blk_2way)
SYM_TYPED_FUNC_START(camellia_dec_blk_2way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst

7
arch/x86/crypto/serpent-avx-x86_64-asm_64.S
View File

@ -9,6 +9,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h>
#include "glue_helper-asm-avx.S"
@ -656,7 +657,7 @@ SYM_FUNC_START_LOCAL(__serpent_dec_blk8_avx)
RET;
SYM_FUNC_END(__serpent_dec_blk8_avx)
SYM_FUNC_START(serpent_ecb_enc_8way_avx)
SYM_TYPED_FUNC_START(serpent_ecb_enc_8way_avx)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -674,7 +675,7 @@ SYM_FUNC_START(serpent_ecb_enc_8way_avx)
RET;
SYM_FUNC_END(serpent_ecb_enc_8way_avx)
SYM_FUNC_START(serpent_ecb_dec_8way_avx)
SYM_TYPED_FUNC_START(serpent_ecb_dec_8way_avx)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -692,7 +693,7 @@ SYM_FUNC_START(serpent_ecb_dec_8way_avx)
RET;
SYM_FUNC_END(serpent_ecb_dec_8way_avx)
SYM_FUNC_START(serpent_cbc_dec_8way_avx)
SYM_TYPED_FUNC_START(serpent_cbc_dec_8way_avx)
/* input:
* %rdi: ctx, CTX
* %rsi: dst

5
arch/x86/crypto/twofish-x86_64-asm_64-3way.S
View File

@ -6,6 +6,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
.file "twofish-x86_64-asm-3way.S"
.text
@ -220,7 +221,7 @@
rorq $32, RAB2; \
outunpack3(mov, RIO, 2, RAB, 2);
SYM_FUNC_START(__twofish_enc_blk_3way)
SYM_TYPED_FUNC_START(__twofish_enc_blk_3way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst
@ -269,7 +270,7 @@ SYM_FUNC_START(__twofish_enc_blk_3way)
RET;
SYM_FUNC_END(__twofish_enc_blk_3way)
SYM_FUNC_START(twofish_dec_blk_3way)
SYM_TYPED_FUNC_START(twofish_dec_blk_3way)
/* input:
* %rdi: ctx, CTX
* %rsi: dst

5
arch/x86/crypto/twofish-x86_64-asm_64.S
View File

@ -8,6 +8,7 @@
.text
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/asm-offsets.h>
#define a_offset 0
@ -202,7 +203,7 @@
xor %r8d, d ## D;\
ror $1, d ## D;
SYM_FUNC_START(twofish_enc_blk)
SYM_TYPED_FUNC_START(twofish_enc_blk)
pushq R1
/* %rdi contains the ctx address */
@ -255,7 +256,7 @@ SYM_FUNC_START(twofish_enc_blk)
RET
SYM_FUNC_END(twofish_enc_blk)
SYM_FUNC_START(twofish_dec_blk)
SYM_TYPED_FUNC_START(twofish_dec_blk)
pushq R1
/* %rdi contains the ctx address */

7
arch/x86/lib/clear_page_64.S
View File

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <linux/export.h>
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/asm.h>
/*
@ -14,7 +15,7 @@
* Zero a page.
* %rdi - page
*/
SYM_FUNC_START(clear_page_rep)
SYM_TYPED_FUNC_START(clear_page_rep)
movl $4096/8,%ecx
xorl %eax,%eax
rep stosq
@ -22,7 +23,7 @@ SYM_FUNC_START(clear_page_rep)
SYM_FUNC_END(clear_page_rep)
EXPORT_SYMBOL_GPL(clear_page_rep)
SYM_FUNC_START(clear_page_orig)
SYM_TYPED_FUNC_START(clear_page_orig)
xorl %eax,%eax
movl $4096/64,%ecx
.p2align 4
@ -44,7 +45,7 @@ SYM_FUNC_START(clear_page_orig)
SYM_FUNC_END(clear_page_orig)
EXPORT_SYMBOL_GPL(clear_page_orig)
SYM_FUNC_START(clear_page_erms)
SYM_TYPED_FUNC_START(clear_page_erms)
movl $4096,%ecx
xorl %eax,%eax
rep stosb

3
arch/x86/lib/copy_page_64.S
View File

@ -3,6 +3,7 @@
#include <linux/export.h>
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h>
#include <asm/alternative.h>
@ -13,7 +14,7 @@
* prefetch distance based on SMP/UP.
*/
ALIGN
SYM_FUNC_START(copy_page)
SYM_TYPED_FUNC_START(copy_page)
ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
movl $4096/8, %ecx
rep movsq

3
arch/x86/lib/memmove_64.S
View File

@ -8,6 +8,7 @@
*/
#include <linux/export.h>
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h>
#include <asm/alternative.h>
@ -26,7 +27,7 @@
* Output:
* rax: dest
*/
SYM_FUNC_START(__memmove)
SYM_TYPED_FUNC_START(__memmove)
mov %rdi, %rax

3
arch/x86/lib/memset_64.S
View File

@ -3,6 +3,7 @@
#include <linux/export.h>
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h>
#include <asm/alternative.h>
@ -28,7 +29,7 @@
* only for the return value that is the same as the source input,
* which the compiler could/should do much better anyway.
*/
SYM_FUNC_START(__memset)
SYM_TYPED_FUNC_START(__memset)
ALTERNATIVE "jmp memset_orig", "", X86_FEATURE_FSRS
movq %rdi,%r9

3
arch/x86/lib/msr-reg.S
View File

@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/linkage.h>
#include <linux/errno.h>
#include <linux/cfi_types.h>
#include <asm/asm.h>
#include <asm/msr.h>
@ -12,7 +13,7 @@
*
*/
.macro op_safe_regs op
SYM_FUNC_START(\op\()_safe_regs)
SYM_TYPED_FUNC_START(\op\()_safe_regs)
pushq %rbx
pushq %r12
movq %rdi, %r10 /* Save pointer */