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[v7,11/16] powerpc: extend execmem_params for kprobes allocations

Message ID 20240429121620.1186447-12-rppt@kernel.org (mailing list archive)
State Superseded
Headers show
Series mm: jit/text allocator | expand

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Commit Message

Mike Rapoport April 29, 2024, 12:16 p.m. UTC 
From: "Mike Rapoport (IBM)" <rppt@kernel.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@kernel.org>
---
 arch/powerpc/kernel/kprobes.c | 20 --------------------
 arch/powerpc/kernel/module.c  |  7 +++++++
 2 files changed, 7 insertions(+), 20 deletions(-)
diff mbox series

Patch

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 ac80559015a3..2a23cf7e141b 100644
--- a/arch/powerpc/kernel/module.c
+++ b/arch/powerpc/kernel/module.c
@@ -94,6 +94,7 @@  static struct execmem_info execmem_info __ro_after_init;
 
 struct execmem_info __init *execmem_arch_setup(void)
 {
+	pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
 	pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
 	unsigned long fallback_start = 0, fallback_end = 0;
 	unsigned long start, end;
@@ -132,6 +133,12 @@  struct execmem_info __init *execmem_arch_setup(void)
 				.fallback_start	= fallback_start,
 				.fallback_end	= fallback_end,
 			},
+			[EXECMEM_KPROBES] = {
+				.start	= VMALLOC_START,
+				.end	= VMALLOC_END,
+				.pgprot	= kprobes_prot,
+				.alignment = 1,
+			},
 			[EXECMEM_MODULE_DATA] = {
 				.start	= VMALLOC_START,
 				.end	= VMALLOC_END,