[RFC PATCH v3 08/20] arm64: Add types to indirect called assembly functions

Sami Tolvanen
2022-06-11T00:42:30Z

With CONFIG_CFI_CLANG, assembly functions indirectly called from C
code must be annotated with type identifiers to pass CFI checking. Use
SYM_TYPED_FUNC_START for the indirectly called functions.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
arch/arm64/crypto/ghash-ce-core.S | 5 +++--
arch/arm64/crypto/sm3-ce-core.S | 3 ++-
arch/arm64/kernel/cpu-reset.S | 5 +++--
arch/arm64/mm/proc.S | 5 +++--
4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/crypto/ghash-ce-core.S b/arch/arm64/crypto/ghash-ce-core.S
index 7868330dd54e..ebe5558929b7 100644
--- a/arch/arm64/crypto/ghash-ce-core.S
+++ b/arch/arm64/crypto/ghash-ce-core.S
@@ -6,6 +6,7 @@
*/

#include <linux/linkage.h>
+#include <linux/cfi_types.h>
#include <asm/assembler.h>

SHASH .req v0
@@ -350,11 +351,11 @@ CPU_LE( rev64 T1.16b, T1.16b )
* void pmull_ghash_update(int blocks, u64 dg[], const char *src,
* struct ghash_key const *k, const char *head)
*/
-SYM_FUNC_START(pmull_ghash_update_p64)
+SYM_TYPED_FUNC_START(pmull_ghash_update_p64)
__pmull_ghash p64
SYM_FUNC_END(pmull_ghash_update_p64)

-SYM_FUNC_START(pmull_ghash_update_p8)
+SYM_TYPED_FUNC_START(pmull_ghash_update_p8)
__pmull_ghash p8
SYM_FUNC_END(pmull_ghash_update_p8)

diff --git a/arch/arm64/crypto/sm3-ce-core.S b/arch/arm64/crypto/sm3-ce-core.S
index ef97d3187cb7..ca70cfacd0d0 100644
--- a/arch/arm64/crypto/sm3-ce-core.S
+++ b/arch/arm64/crypto/sm3-ce-core.S
@@ -6,6 +6,7 @@
*/

#include <linux/linkage.h>
+#include <linux/cfi_types.h>
#include <asm/assembler.h>

.irp b, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
@@ -73,7 +74,7 @@
* int blocks)
*/
.text
-SYM_FUNC_START(sm3_ce_transform)
+SYM_TYPED_FUNC_START(sm3_ce_transform)
/* load state */
ld1 {v8.4s-v9.4s}, [x0]
rev64 v8.4s, v8.4s
diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S
index 48a8af97faa9..6b752fe89745 100644
--- a/arch/arm64/kernel/cpu-reset.S
+++ b/arch/arm64/kernel/cpu-reset.S
@@ -8,6 +8,7 @@
*/

#include <linux/linkage.h>
+#include <linux/cfi_types.h>
#include <asm/assembler.h>
#include <asm/sysreg.h>
#include <asm/virt.h>
@@ -28,7 +29,7 @@
* branch to what would be the reset vector. It must be executed with the
* flat identity mapping.
*/
-SYM_CODE_START(cpu_soft_restart)
+SYM_TYPED_FUNC_START(cpu_soft_restart)
mov_q x12, INIT_SCTLR_EL1_MMU_OFF
pre_disable_mmu_workaround
/*
@@ -47,6 +48,6 @@ SYM_CODE_START(cpu_soft_restart)
mov x1, x3 // arg1
mov x2, x4 // arg2
br x8
-SYM_CODE_END(cpu_soft_restart)
+SYM_FUNC_END(cpu_soft_restart)

.popsection
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 50bbed947bec..dfa715315551 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -10,6 +10,7 @@
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/pgtable.h>
+#include <linux/cfi_types.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/asm_pointer_auth.h>
@@ -184,7 +185,7 @@ SYM_FUNC_END(cpu_do_resume)
* This is the low-level counterpart to cpu_replace_ttbr1, and should not be
* called by anything else. It can only be executed from a TTBR0 mapping.
*/
-SYM_FUNC_START(idmap_cpu_replace_ttbr1)
+SYM_TYPED_FUNC_START(idmap_cpu_replace_ttbr1)
save_and_disable_daif flags=x2

__idmap_cpu_set_reserved_ttbr1 x1, x3
@@ -224,7 +225,7 @@ SYM_FUNC_END(idmap_cpu_replace_ttbr1)
*/
__idmap_kpti_flag:
.long 1
-SYM_FUNC_START(idmap_kpti_install_ng_mappings)
+SYM_TYPED_FUNC_START(idmap_kpti_install_ng_mappings)
cpu .req w0
num_cpus .req w1
swapper_pa .req x2