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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/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h> #include <asm/frame.h>
#define CAMELLIA_TABLE_BYTE_LEN 272 #define CAMELLIA_TABLE_BYTE_LEN 272
@ -882,7 +883,7 @@ SYM_FUNC_START_LOCAL(__camellia_dec_blk16)
jmp .Ldec_max24; jmp .Ldec_max24;
SYM_FUNC_END(__camellia_dec_blk16) SYM_FUNC_END(__camellia_dec_blk16)
SYM_FUNC_START(camellia_ecb_enc_16way) SYM_TYPED_FUNC_START(camellia_ecb_enc_16way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst (16 blocks) * %rsi: dst (16 blocks)
@ -907,7 +908,7 @@ SYM_FUNC_START(camellia_ecb_enc_16way)
RET; RET;
SYM_FUNC_END(camellia_ecb_enc_16way) SYM_FUNC_END(camellia_ecb_enc_16way)
SYM_FUNC_START(camellia_ecb_dec_16way) SYM_TYPED_FUNC_START(camellia_ecb_dec_16way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst (16 blocks) * %rsi: dst (16 blocks)
@ -937,7 +938,7 @@ SYM_FUNC_START(camellia_ecb_dec_16way)
RET; RET;
SYM_FUNC_END(camellia_ecb_dec_16way) SYM_FUNC_END(camellia_ecb_dec_16way)
SYM_FUNC_START(camellia_cbc_dec_16way) SYM_TYPED_FUNC_START(camellia_cbc_dec_16way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst (16 blocks) * %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/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h> #include <asm/frame.h>
#define CAMELLIA_TABLE_BYTE_LEN 272 #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/linkage.h>
#include <linux/cfi_types.h>
.file "camellia-x86_64-asm_64.S" .file "camellia-x86_64-asm_64.S"
.text .text
@ -177,7 +178,7 @@
bswapq RAB0; \ bswapq RAB0; \
movq RAB0, 4*2(RIO); movq RAB0, 4*2(RIO);
SYM_FUNC_START(__camellia_enc_blk) SYM_TYPED_FUNC_START(__camellia_enc_blk)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -224,7 +225,7 @@ SYM_FUNC_START(__camellia_enc_blk)
RET; RET;
SYM_FUNC_END(__camellia_enc_blk) SYM_FUNC_END(__camellia_enc_blk)
SYM_FUNC_START(camellia_dec_blk) SYM_TYPED_FUNC_START(camellia_dec_blk)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -411,7 +412,7 @@ SYM_FUNC_END(camellia_dec_blk)
bswapq RAB1; \ bswapq RAB1; \
movq RAB1, 12*2(RIO); movq RAB1, 12*2(RIO);
SYM_FUNC_START(__camellia_enc_blk_2way) SYM_TYPED_FUNC_START(__camellia_enc_blk_2way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -460,7 +461,7 @@ SYM_FUNC_START(__camellia_enc_blk_2way)
RET; RET;
SYM_FUNC_END(__camellia_enc_blk_2way) SYM_FUNC_END(__camellia_enc_blk_2way)
SYM_FUNC_START(camellia_dec_blk_2way) SYM_TYPED_FUNC_START(camellia_dec_blk_2way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %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/linkage.h>
#include <linux/cfi_types.h>
#include <asm/frame.h> #include <asm/frame.h>
#include "glue_helper-asm-avx.S" #include "glue_helper-asm-avx.S"
@ -656,7 +657,7 @@ SYM_FUNC_START_LOCAL(__serpent_dec_blk8_avx)
RET; RET;
SYM_FUNC_END(__serpent_dec_blk8_avx) 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: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -674,7 +675,7 @@ SYM_FUNC_START(serpent_ecb_enc_8way_avx)
RET; RET;
SYM_FUNC_END(serpent_ecb_enc_8way_avx) 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: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -692,7 +693,7 @@ SYM_FUNC_START(serpent_ecb_dec_8way_avx)
RET; RET;
SYM_FUNC_END(serpent_ecb_dec_8way_avx) 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: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %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/linkage.h>
#include <linux/cfi_types.h>
.file "twofish-x86_64-asm-3way.S" .file "twofish-x86_64-asm-3way.S"
.text .text
@ -220,7 +221,7 @@
rorq $32, RAB2; \ rorq $32, RAB2; \
outunpack3(mov, RIO, 2, RAB, 2); outunpack3(mov, RIO, 2, RAB, 2);
SYM_FUNC_START(__twofish_enc_blk_3way) SYM_TYPED_FUNC_START(__twofish_enc_blk_3way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst
@ -269,7 +270,7 @@ SYM_FUNC_START(__twofish_enc_blk_3way)
RET; RET;
SYM_FUNC_END(__twofish_enc_blk_3way) SYM_FUNC_END(__twofish_enc_blk_3way)
SYM_FUNC_START(twofish_dec_blk_3way) SYM_TYPED_FUNC_START(twofish_dec_blk_3way)
/* input: /* input:
* %rdi: ctx, CTX * %rdi: ctx, CTX
* %rsi: dst * %rsi: dst

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

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

7
arch/x86/lib/clear_page_64.S
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */ /* SPDX-License-Identifier: GPL-2.0-only */
#include <linux/export.h> #include <linux/export.h>
#include <linux/linkage.h> #include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/asm.h> #include <asm/asm.h>
/* /*
@ -14,7 +15,7 @@
* Zero a page. * Zero a page.
* %rdi - page * %rdi - page
*/ */
SYM_FUNC_START(clear_page_rep) SYM_TYPED_FUNC_START(clear_page_rep)
movl $4096/8,%ecx movl $4096/8,%ecx
xorl %eax,%eax xorl %eax,%eax
rep stosq rep stosq
@ -22,7 +23,7 @@ SYM_FUNC_START(clear_page_rep)
SYM_FUNC_END(clear_page_rep) SYM_FUNC_END(clear_page_rep)
EXPORT_SYMBOL_GPL(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 xorl %eax,%eax
movl $4096/64,%ecx movl $4096/64,%ecx
.p2align 4 .p2align 4
@ -44,7 +45,7 @@ SYM_FUNC_START(clear_page_orig)
SYM_FUNC_END(clear_page_orig) SYM_FUNC_END(clear_page_orig)
EXPORT_SYMBOL_GPL(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 movl $4096,%ecx
xorl %eax,%eax xorl %eax,%eax
rep stosb rep stosb

3
arch/x86/lib/copy_page_64.S
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@ -3,6 +3,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/linkage.h> #include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h> #include <asm/cpufeatures.h>
#include <asm/alternative.h> #include <asm/alternative.h>
@ -13,7 +14,7 @@
* prefetch distance based on SMP/UP. * prefetch distance based on SMP/UP.
*/ */
ALIGN ALIGN
SYM_FUNC_START(copy_page) SYM_TYPED_FUNC_START(copy_page)
ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
movl $4096/8, %ecx movl $4096/8, %ecx
rep movsq rep movsq

3
arch/x86/lib/memmove_64.S
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@ -8,6 +8,7 @@
*/ */
#include <linux/export.h> #include <linux/export.h>
#include <linux/linkage.h> #include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h> #include <asm/cpufeatures.h>
#include <asm/alternative.h> #include <asm/alternative.h>
@ -26,7 +27,7 @@
* Output: * Output:
* rax: dest * rax: dest
*/ */
SYM_FUNC_START(__memmove) SYM_TYPED_FUNC_START(__memmove)
mov %rdi, %rax mov %rdi, %rax

3
arch/x86/lib/memset_64.S
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@ -3,6 +3,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/linkage.h> #include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/cpufeatures.h> #include <asm/cpufeatures.h>
#include <asm/alternative.h> #include <asm/alternative.h>
@ -28,7 +29,7 @@
* only for the return value that is the same as the source input, * only for the return value that is the same as the source input,
* which the compiler could/should do much better anyway. * 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 ALTERNATIVE "jmp memset_orig", "", X86_FEATURE_FSRS
movq %rdi,%r9 movq %rdi,%r9

3
arch/x86/lib/msr-reg.S
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */ /* SPDX-License-Identifier: GPL-2.0 */
#include <linux/linkage.h> #include <linux/linkage.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/cfi_types.h>
#include <asm/asm.h> #include <asm/asm.h>
#include <asm/msr.h> #include <asm/msr.h>
@ -12,7 +13,7 @@
* *
*/ */
.macro op_safe_regs op .macro op_safe_regs op
SYM_FUNC_START(\op\()_safe_regs) SYM_TYPED_FUNC_START(\op\()_safe_regs)
pushq %rbx pushq %rbx
pushq %r12 pushq %r12
movq %rdi, %r10 /* Save pointer */ movq %rdi, %r10 /* Save pointer */