linux-kernel - [PATCH v4 10/15] powerpc: extend execmem

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Message-ID: <20240411160051.2093261-11-rppt@kernel.org>
Date: Thu, 11 Apr 2024 19:00:46 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Björn Töpel <bjorn@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
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Subject: [PATCH v4 10/15] powerpc: extend execmem_params for kprobes allocations

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

powerpc overrides kprobes::alloc_insn_page() to remove writable
permissions when STRICT_MODULE_RWX is on.

Add definition of EXECMEM_KRPOBES to execmem_params to allow using the
generic kprobes::alloc_insn_page() with the desired permissions.

As powerpc uses breakpoint instructions to inject kprobes, it does not
need to constrain kprobe allocations to the modules area and can use the
entire vmalloc address space.

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 arch/powerpc/kernel/kprobes.c | 20 --------------------
 arch/powerpc/kernel/module.c  | 11 +++++++++++
 2 files changed, 11 insertions(+), 20 deletions(-)

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 9fcd01bb2ce6..14c5ddec3056 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -126,26 +126,6 @@ kprobe_opcode_t *arch_adjust_kprobe_addr(unsigned long addr, unsigned long offse
 	return (kprobe_opcode_t *)(addr + offset);
 }
 
-void *alloc_insn_page(void)
-{
-	void *page;
-
-	page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE);
-	if (!page)
-		return NULL;
-
-	if (strict_module_rwx_enabled()) {
-		int err = set_memory_rox((unsigned long)page, 1);
-
-		if (err)
-			goto error;
-	}
-	return page;
-error:
-	execmem_free(page);
-	return NULL;
-}
-
 int arch_prepare_kprobe(struct kprobe *p)
 {
 	int ret = 0;
diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c
index 5a1d0490c831..a1eaa74f2d41 100644
--- a/arch/powerpc/kernel/module.c
+++ b/arch/powerpc/kernel/module.c
@@ -95,6 +95,9 @@ static struct execmem_info execmem_info __ro_after_init = {
 		[EXECMEM_DEFAULT] = {
 			.alignment = 1,
 		},
+		[EXECMEM_KPROBES] = {
+			.alignment = 1,
+		},
 		[EXECMEM_MODULE_DATA] = {
 			.alignment = 1,
 		},
@@ -137,5 +140,13 @@ struct execmem_info __init *execmem_arch_setup(void)
 
 	text->pgprot = prot;
 
+	execmem_info.ranges[EXECMEM_KPROBES].start = VMALLOC_START;
+	execmem_info.ranges[EXECMEM_KPROBES].start = VMALLOC_END;
+
+	if (strict_module_rwx_enabled())
+		execmem_info.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX;
+	else
+		execmem_info.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_EXEC;
+
 	return &execmem_info;
 }
-- 
2.43.0