linux-kernel - [PATCH v2] arm64: kernel: remove SHF_WRITE|SHF

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Message-ID: <20230428-awx-v2-1-b197ffa16edc@google.com>
Date:   Fri, 28 Apr 2023 11:28:17 -0700
From:   ndesaulniers@...gle.com
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v2] arm64: kernel: remove SHF_WRITE|SHF_EXECINSTR from .idmap.text

commit d54170812ef1 ("arm64: fix .idmap.text assertion for large kernels")
modified some of the section assembler directives that declare
.idmap.text to be SHF_ALLOC instead of
SHF_ALLOC|SHF_WRITE|SHF_EXECINSTR.

This patch fixes up the remaining stragglers that were left behind.  Add
Fixes tag so that this doesn't precede related change in stable.

Fixes: d54170812ef1 ("arm64: fix .idmap.text assertion for large kernels")
Reported-by: Greg Thelen <gthelen@...gle.com>
Reviewed-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
Changes in v2:
- Drop irrelevant paragraph.
- Pick up Ard's RB tag.
- Link to v1: https://lore.kernel.org/r/20230428-awx-v1-1-1f490286ba62@google.com
---
 arch/arm64/kernel/cpu-reset.S | 2 +-
 arch/arm64/kernel/sleep.S     | 2 +-
 arch/arm64/mm/proc.S          | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S
index 6b752fe89745..c87445dde674 100644
--- a/arch/arm64/kernel/cpu-reset.S
+++ b/arch/arm64/kernel/cpu-reset.S
@@ -14,7 +14,7 @@
 #include <asm/virt.h>
 
 .text
-.pushsection    .idmap.text, "awx"
+.pushsection    .idmap.text, "a"
 
 /*
  * cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2)
diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
index 2ae7cff1953a..2aa5129d8253 100644
--- a/arch/arm64/kernel/sleep.S
+++ b/arch/arm64/kernel/sleep.S
@@ -97,7 +97,7 @@ SYM_FUNC_START(__cpu_suspend_enter)
 	ret
 SYM_FUNC_END(__cpu_suspend_enter)
 
-	.pushsection ".idmap.text", "awx"
+	.pushsection ".idmap.text", "a"
 SYM_CODE_START(cpu_resume)
 	mov	x0, xzr
 	bl	init_kernel_el
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 91410f488090..c2cb437821ca 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -167,7 +167,7 @@ alternative_else_nop_endif
 SYM_FUNC_END(cpu_do_resume)
 #endif
 
-	.pushsection ".idmap.text", "awx"
+	.pushsection ".idmap.text", "a"
 
 .macro	__idmap_cpu_set_reserved_ttbr1, tmp1, tmp2
 	adrp	\tmp1, reserved_pg_dir
@@ -201,7 +201,7 @@ SYM_FUNC_END(idmap_cpu_replace_ttbr1)
 
 #define KPTI_NG_PTE_FLAGS	(PTE_ATTRINDX(MT_NORMAL) | SWAPPER_PTE_FLAGS)
 
-	.pushsection ".idmap.text", "awx"
+	.pushsection ".idmap.text", "a"
 
 	.macro	kpti_mk_tbl_ng, type, num_entries
 	add	end_\type\()p, cur_\type\()p, #\num_entries * 8
@@ -400,7 +400,7 @@ SYM_FUNC_END(idmap_kpti_install_ng_mappings)
  * Output:
  *	Return in x0 the value of the SCTLR_EL1 register.
  */
-	.pushsection ".idmap.text", "awx"
+	.pushsection ".idmap.text", "a"
 SYM_FUNC_START(__cpu_setup)
 	tlbi	vmalle1				// Invalidate local TLB
 	dsb	nsh

---
base-commit: 22b8cc3e78f5448b4c5df00303817a9137cd663f
change-id: 20230428-awx-c73f4bde79c4

Best regards,
-- 
Nick Desaulniers <ndesaulniers@...gle.com>