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 [thread overview]
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;
>
next prev parent reply other threads:[~2021-03-30 5:06 UTC|newest]
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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