[PATCH v3 14/39] x86/ibt,crypto: Add ENDBR for the jump-table entries

Peter Zijlstra
2022-03-03T11:31:18Z

The code does:

## branch into array
mov jump_table(,%rax,8), %bufp
JMP_NOSPEC bufp

resulting in needing to mark the jump-table entries with ENDBR.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/crypto/crc32c-pcl-intel-asm_64.S | 3 +++
1 file changed, 3 insertions(+)

--- a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
+++ b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
@@ -195,6 +195,7 @@ SYM_FUNC_START(crc_pcl)
.altmacro
LABEL crc_ %i
.noaltmacro
+ ENDBR
crc32q -i*8(block_0), crc_init
crc32q -i*8(block_1), crc1
crc32q -i*8(block_2), crc2
@@ -204,6 +205,7 @@ LABEL crc_ %i
.altmacro
LABEL crc_ %i
.noaltmacro
+ ENDBR
crc32q -i*8(block_0), crc_init
crc32q -i*8(block_1), crc1
# SKIP crc32 -i*8(block_2), crc2 ; Don't do this one yet
@@ -237,6 +239,7 @@ LABEL crc_ %i
################################################################

LABEL crc_ 0
+ ENDBR
mov tmp, len
cmp $128*24, tmp
jae full_block