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Roberts wrote: > On 18/09/2025 16:05, Yang Shi wrote: >> >> On 9/18/25 5:48 AM, Catalin Marinas wrote: >>> On Wed, Sep 17, 2025 at 12:02:11PM -0700, Yang Shi wrote: >>>> The kprobe page is allocated by execmem allocator with ROX permission. >>>> It needs to call set_memory_rox() to set proper permission for the >>>> direct map too. It was missed. >>>> >>>> And the set_memory_rox() guarantees the direct map will be split if it >>>> needs so that set_direct_map calls in vfree() won't fail. >>>> >>>> Fixes: 10d5e97c1bf8 ("arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page") >>>> Signed-off-by: Yang Shi >>>> --- >>>>   arch/arm64/kernel/probes/kprobes.c | 12 ++++++++++++ >>>>   1 file changed, 12 insertions(+) >>>> >>>> diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/ >>>> kprobes.c >>>> index 0c5d408afd95..c4f8c4750f1e 100644 >>>> --- a/arch/arm64/kernel/probes/kprobes.c >>>> +++ b/arch/arm64/kernel/probes/kprobes.c >>>> @@ -10,6 +10,7 @@ >>>>     #define pr_fmt(fmt) "kprobes: " fmt >>>>   +#include >>>>   #include >>>>   #include >>>>   #include >>>> @@ -41,6 +42,17 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); >>>>   static void __kprobes >>>>   post_kprobe_handler(struct kprobe *, struct kprobe_ctlblk *, struct pt_regs >>>> *); >>>>   +void *alloc_insn_page(void) >>>> +{ >>>> +    void *page; >>> Nit: I'd call this 'addr'. 'page' makes me think of a struct page. >> Sure. >> >>>> + >>>> +    page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); >>>> +    if (!page) >>>> +        return NULL; >>>> +    set_memory_rox((unsigned long)page, 1); >>> It's unfortunate that we change the attributes of the ROX vmap first to >>> RO, then to back to ROX so that we get the linear map changed. Maybe >>> factor out some of the code in change_memory_common() to only change the >>> linear map. >> I want to make sure I understand you correctly, you meant set_memory_rox() >> should do: >> >> change linear map to RO (call a new helper, for example, set_direct_map_ro()) >> change vmap to ROX (call change_memory_common()) >> >> Is it correct? >> >> If so set_memory_ro() should do the similar thing. >> >> And I think we should have the cleanup patch separate from this bug fix patch >> because the bug fix patch should be applied to -stable release too. Keeping it >> simpler makes the backport easier. >> >> Shall I squash the cleanup patch into patch #1? > > Personally I think we should drop this patch from the series and handle it > separately. > > We worked out that the requirement is to either never call set_memory_*() or to > call set_memory_*() for the entire vmalloc'ed range prior to optionally calling > set_memory_*() for a sub-range in order to guarrantee vm_reset_perms() works > correctly. > > Given this is only allocating a single page, it is impossible to call > set_memory_*() for a sub-range. So the requirement is met. > > I agree it looks odd/wrong to have different permissions in the linear map vs > the vmap but that is an orthogonal bug that can be fixed separately. > > What do you think? Yeah, sounds good to me. Thanks, Yang > > Thanks, > Ryan > > >> Thanks, >> Yang >> >>> Otherwise it looks fine. >>>