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From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Jordan Niethe <jniethe5@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: ajd@linux.ibm.com, npiggin@gmail.com, cmr@codefail.de,
	naveen.n.rao@linux.ibm.com, dja@axtens.net
Subject: Re: [PATCH v10 04/10] powerpc/kprobes: Mark newly allocated probes as ROX
Date: Tue, 30 Mar 2021 07:05:47 +0200
Message-ID: <d61a1b2f-4a22-fb43-e8fe-a7612431c4ad@csgroup.eu> (raw)
In-Reply-To: <20210330045132.722243-5-jniethe5@gmail.com>



Le 30/03/2021 à 06:51, Jordan Niethe a écrit :
> From: Russell Currey <ruscur@russell.cc>
> 
> Add the arch specific insn page allocator for powerpc. This allocates
> ROX pages if STRICT_KERNEL_RWX is enabled. These pages are only written
> to with patch_instruction() which is able to write RO pages.
> 
> Reviewed-by: Daniel Axtens <dja@axtens.net>
> Signed-off-by: Russell Currey <ruscur@russell.cc>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> [jpn: Reword commit message, switch to __vmalloc_node_range()]
> Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
> ---
> v9: - vmalloc_exec() no longer exists
>      - Set the page to RW before freeing it
> v10: - use __vmalloc_node_range()
> ---
>   arch/powerpc/kernel/kprobes.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
> index 01ab2163659e..3ae27af9b094 100644
> --- a/arch/powerpc/kernel/kprobes.c
> +++ b/arch/powerpc/kernel/kprobes.c
> @@ -25,6 +25,7 @@
>   #include <asm/sections.h>
>   #include <asm/inst.h>
>   #include <linux/uaccess.h>
> +#include <linux/vmalloc.h>
>   
>   DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
>   DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
> @@ -103,6 +104,19 @@ kprobe_opcode_t *kprobe_lookup_name(const char *name, unsigned int offset)
>   	return addr;
>   }
>   
> +void *alloc_insn_page(void)
> +{
> +	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
> +		return __vmalloc_node_range(PAGE_SIZE, 1, MODULES_VADDR, MODULES_END,
> +				GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS,
> +				NUMA_NO_NODE, __builtin_return_address(0));
> +	} else {
> +		return __vmalloc_node_range(PAGE_SIZE, 1, MODULES_VADDR, MODULES_END,
> +				GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
> +				NUMA_NO_NODE, __builtin_return_address(0));
> +	}
> +}
> +

What about

void *alloc_insn_page(void)
{
	pgprot_t prot = IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;

	return __vmalloc_node_range(PAGE_SIZE, 1, MODULES_VADDR, MODULES_END,
			GFP_KERNEL, prot, VM_FLUSH_RESET_PERMS,
			NUMA_NO_NODE, __builtin_return_address(0));
}

>   int arch_prepare_kprobe(struct kprobe *p)
>   {
>   	int ret = 0;
> 

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30  4:51 [PATCH v10 00/10] powerpc: Further Strict RWX support Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 01/10] powerpc/mm: Implement set_memory() routines Jordan Niethe
2021-03-30  5:16   ` Christophe Leroy
2021-04-21  2:51     ` Jordan Niethe
2021-03-31 11:16   ` Michael Ellerman
2021-03-31 12:03     ` Christophe Leroy
2021-04-21  5:03     ` Jordan Niethe
2021-04-01  4:37   ` Aneesh Kumar K.V
2021-04-21  5:19     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 02/10] powerpc/lib/code-patching: Set up Strict RWX patching earlier Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 03/10] powerpc: Always define MODULES_{VADDR,END} Jordan Niethe
2021-03-30  5:00   ` Christophe Leroy
2021-04-01 13:36   ` Christophe Leroy
2021-04-21  2:46     ` Jordan Niethe
2021-04-21  5:14       ` Christophe Leroy
2021-04-21  5:22         ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 04/10] powerpc/kprobes: Mark newly allocated probes as ROX Jordan Niethe
2021-03-30  5:05   ` Christophe Leroy [this message]
2021-04-21  2:39     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 05/10] powerpc/bpf: Write protect JIT code Jordan Niethe
2021-03-31 10:37   ` Michael Ellerman
2021-03-31 10:39     ` Christophe Leroy
2021-04-21  2:35     ` Jordan Niethe
2021-04-21  6:51       ` Michael Ellerman
2021-03-30  4:51 ` [PATCH v10 06/10] powerpc/mm/ptdump: debugfs handler for W+X checks at runtime Jordan Niethe
2021-03-31 11:24   ` Michael Ellerman
2021-04-21  2:23     ` Jordan Niethe
2021-04-21  5:16       ` Christophe Leroy
2021-03-30  4:51 ` [PATCH v10 07/10] powerpc: Set ARCH_HAS_STRICT_MODULE_RWX Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 08/10] powerpc/configs: Enable STRICT_MODULE_RWX in skiroot_defconfig Jordan Niethe
2021-03-30  5:27   ` Christophe Leroy
2021-04-21  2:37     ` Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 09/10] powerpc/mm: implement set_memory_attr() Jordan Niethe
2021-03-30  4:51 ` [PATCH v10 10/10] powerpc/32: use set_memory_attr() Jordan Niethe

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