| Message ID | 20230918072955.2507221-8-rppt@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm: jit/text allocator | expand |
On Mon, Sep 18, 2023 at 10:29:49AM +0300, Mike Rapoport wrote: > From: "Mike Rapoport (IBM)" <rppt@kernel.org> > > The memory allocations for kprobes and BPF on arm64 can be placed > anywhere in vmalloc address space and currently this is implemented with > overrides of alloc_insn_page() and bpf_jit_alloc_exec() in arm64. > > Define EXECMEM_KPROBES and EXECMEM_BPF ranges in arm64::execmem_params and > drop overrides of alloc_insn_page() and bpf_jit_alloc_exec(). > > Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org> > --- > arch/arm64/kernel/module.c | 13 +++++++++++++ > arch/arm64/kernel/probes/kprobes.c | 7 ------- > arch/arm64/net/bpf_jit_comp.c | 11 ----------- > 3 files changed, 13 insertions(+), 18 deletions(-) > > diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c > index cd6320de1c54..d27db168d2a2 100644 > --- a/arch/arm64/kernel/module.c > +++ b/arch/arm64/kernel/module.c > @@ -116,6 +116,16 @@ static struct execmem_params execmem_params __ro_after_init = { > .flags = EXECMEM_KASAN_SHADOW, > .alignment = MODULE_ALIGN, > }, > + [EXECMEM_KPROBES] = { > + .start = VMALLOC_START, > + .end = VMALLOC_END, > + .alignment = 1, > + }, > + [EXECMEM_BPF] = { > + .start = VMALLOC_START, > + .end = VMALLOC_END, > + .alignment = 1, > + }, > }, > }; > > @@ -140,6 +150,9 @@ struct execmem_params __init *execmem_arch_params(void) > r->end = module_plt_base + SZ_2G; > } > > + execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX; > + execmem_params.ranges[EXECMEM_BPF].pgprot = PAGE_KERNEL; > + > return &execmem_params; > } > > diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c > index 70b91a8c6bb3..6fccedd02b2a 100644 > --- a/arch/arm64/kernel/probes/kprobes.c > +++ b/arch/arm64/kernel/probes/kprobes.c > @@ -129,13 +129,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) > return 0; > } > > -void *alloc_insn_page(void) > -{ > - return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, > - GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, > - NUMA_NO_NODE, __builtin_return_address(0)); > -} It's slightly curious that we didn't clear the tag here, so it's nice that it all happens magically with your series: Acked-by: Will Deacon <will@kernel.org> Will
diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index cd6320de1c54..d27db168d2a2 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -116,6 +116,16 @@ static struct execmem_params execmem_params __ro_after_init = { .flags = EXECMEM_KASAN_SHADOW, .alignment = MODULE_ALIGN, }, + [EXECMEM_KPROBES] = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .alignment = 1, + }, + [EXECMEM_BPF] = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .alignment = 1, + }, }, }; @@ -140,6 +150,9 @@ struct execmem_params __init *execmem_arch_params(void) r->end = module_plt_base + SZ_2G; } + execmem_params.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX; + execmem_params.ranges[EXECMEM_BPF].pgprot = PAGE_KERNEL; + return &execmem_params; } diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 70b91a8c6bb3..6fccedd02b2a 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -129,13 +129,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) return 0; } -void *alloc_insn_page(void) -{ - return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, __builtin_return_address(0)); -} - /* arm kprobe: install breakpoint in text */ void __kprobes arch_arm_kprobe(struct kprobe *p) { diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 150d1c6543f7..3a7590f828d1 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -1687,17 +1687,6 @@ u64 bpf_jit_alloc_exec_limit(void) return VMALLOC_END - VMALLOC_START; } -void *bpf_jit_alloc_exec(unsigned long size) -{ - /* Memory is intended to be executable, reset the pointer tag. */ - return kasan_reset_tag(vmalloc(size)); -} - -void bpf_jit_free_exec(void *addr) -{ - return vfree(addr); -} - /* Indicate the JIT backend supports mixing bpf2bpf and tailcalls. */ bool bpf_jit_supports_subprog_tailcalls(void) {