From c50d32859e70f6dbccb7d151408eb10afbbb7965 Mon Sep 17 00:00:00 2001 From: Sami Tolvanen Date: Thu, 8 Sep 2022 14:54:51 -0700 Subject: arm64: Add types to indirect called assembly functions 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, and ensure we emit `bti c` also with SYM_TYPED_FUNC_START. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Tested-by: Kees Cook Tested-by: Nathan Chancellor Acked-by: Peter Zijlstra (Intel) Tested-by: Peter Zijlstra (Intel) Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20220908215504.3686827-10-samitolvanen@google.com --- arch/arm64/crypto/ghash-ce-core.S | 5 +++-- arch/arm64/crypto/sm3-ce-core.S | 3 ++- arch/arm64/include/asm/linkage.h | 4 ++++ arch/arm64/kernel/cpu-reset.S | 5 +++-- arch/arm64/mm/proc.S | 5 +++-- 5 files changed, 15 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 +#include #include 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 +#include #include .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/include/asm/linkage.h b/arch/arm64/include/asm/linkage.h index 43f8c25b3fda..1436fa1cde24 100644 --- a/arch/arm64/include/asm/linkage.h +++ b/arch/arm64/include/asm/linkage.h @@ -39,4 +39,8 @@ SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ bti c ; +#define SYM_TYPED_FUNC_START(name) \ + SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ + bti c ; + #endif 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 +#include #include #include #include @@ -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 7837a69524c5..8b9f419fcad9 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -185,7 +186,7 @@ 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 @@ -253,7 +254,7 @@ SYM_FUNC_END(idmap_cpu_replace_ttbr1) SYM_DATA(__idmap_kpti_flag, .long 1) .popsection -SYM_FUNC_START(idmap_kpti_install_ng_mappings) +SYM_TYPED_FUNC_START(idmap_kpti_install_ng_mappings) cpu .req w0 temp_pte .req x0 num_cpus .req w1 -- cgit v1.2.3