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Sat, 27 Jun 2020 00:34:54 -0700 (PDT) MIME-Version: 1.0 References: <20200618064307.32739-1-hch@lst.de> <20200618064307.32739-3-hch@lst.de> In-Reply-To: <20200618064307.32739-3-hch@lst.de> From: Ard Biesheuvel Date: Sat, 27 Jun 2020 09:34:42 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 2/3] arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page To: Christoph Hellwig Cc: Andrew Morton , linux-hyperv@vger.kernel.org, Peter Zijlstra , Catalin Marinas , X86 ML , Dexuan Cui , Linux Kernel Mailing List , linux-mm@kvack.org, Jessica Yu , Vitaly Kuznetsov , Will Deacon , Linux ARM Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 2FB798007DF7 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 18 Jun 2020 at 08:44, Christoph Hellwig wrote: > > Use PAGE_KERNEL_ROX directly instead of allocating RWX and setting the > page read-only just after the allocation. > > Signed-off-by: Christoph Hellwig > --- > arch/arm64/kernel/probes/kprobes.c | 12 +++--------- > 1 file changed, 3 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c > index d1c95dcf1d7833..cbe49cd117cfec 100644 > --- a/arch/arm64/kernel/probes/kprobes.c > +++ b/arch/arm64/kernel/probes/kprobes.c > @@ -120,15 +120,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) > > void *alloc_insn_page(void) > { > - void *page; > - > - page = vmalloc_exec(PAGE_SIZE); > - if (page) { > - set_memory_ro((unsigned long)page, 1); > - set_vm_flush_reset_perms(page); > - } > - > - return page; > + return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, > + GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, > + NUMA_NO_NODE, __func__); Why is this passing a string for the 'caller' argument, and not the address of the caller? > } > > /* arm kprobe: install breakpoint in text */ > -- > 2.26.2 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel