From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E235BC433DF for ; Thu, 21 May 2020 15:45:51 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 924B3207D8 for ; Thu, 21 May 2020 15:45:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="T4I33Jdb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 924B3207D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4B5E480014; Thu, 21 May 2020 11:45:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4939F80008; Thu, 21 May 2020 11:45:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 356BE80014; Thu, 21 May 2020 11:45:50 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0131.hostedemail.com [216.40.44.131]) by kanga.kvack.org (Postfix) with ESMTP id 1E93E80008 for ; Thu, 21 May 2020 11:45:50 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id CD3204DDA for ; Thu, 21 May 2020 15:45:49 +0000 (UTC) X-FDA: 76841151618.26.blood24_8a258694cb863 X-HE-Tag: blood24_8a258694cb863 X-Filterd-Recvd-Size: 11787 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Thu, 21 May 2020 15:45:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=i5TU1vNWnnJC2NIa0U964oDN5YtEgAir0R98ZveIh/8=; b=T4I33JdbwslyweT7EllJeaMoqI IeCjIun7kmy5aXLrzeGZb3DTLRT1phKX9nxpMAfvO2cC5c0NPUDD5ffKNACUvoHXQZSwcg/9hyh9S SoovtksyMymVBJ1bV0VKZGjHNfb9JfS2UxddH4Q6WcJJb2A3vnzuRFbumtyl/6yS0Z/jJJ1rgU0qL EPrhnIRHZYV+GHeOxRyuzVe9zGTZ4rN5+7z1FMiQIr0wDSOwkuC52PO0SSCN9yD9PBc6D8sC6HPgu 6QxL10yHlanSfYQ4wHcwv8lPYxuXK4Ivd+PgWYQWn0Ms/ST56QZavdzWXeXbeTdN2ChCoacrKdxGl ciOOTGZQ==; Received: from [2001:4bb8:18c:5da7:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jbn3F-0004tj-EZ; Thu, 21 May 2020 15:24:06 +0000 From: Christoph Hellwig To: x86@kernel.org, Alexei Starovoitov , Daniel Borkmann , Masami Hiramatsu , Linus Torvalds , Andrew Morton Cc: linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 21/23] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault Date: Thu, 21 May 2020 17:22:59 +0200 Message-Id: <20200521152301.2587579-22-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200521152301.2587579-1-hch@lst.de> References: <20200521152301.2587579-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Content-Transfer-Encoding: quoted-printable 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: Better describe what these functions do. Suggested-by: Linus Torvalds Signed-off-by: Christoph Hellwig --- arch/powerpc/kernel/process.c | 3 ++- arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 ++-- arch/powerpc/mm/fault.c | 2 +- arch/powerpc/oprofile/backtrace.c | 6 ++++-- arch/powerpc/perf/callchain_32.c | 2 +- arch/powerpc/perf/callchain_64.c | 2 +- arch/powerpc/perf/core-book3s.c | 3 ++- arch/powerpc/sysdev/fsl_pci.c | 4 ++-- include/linux/uaccess.h | 4 ++-- kernel/trace/bpf_trace.c | 4 ++-- kernel/trace/trace_kprobe.c | 2 +- mm/maccess.c | 10 +++++----- 12 files changed, 25 insertions(+), 21 deletions(-) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.= c index 9c21288f86455..d5d6136b13480 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1294,7 +1294,8 @@ void show_user_instructions(struct pt_regs *regs) for (i =3D 0; i < 8 && n; i++, n--, pc +=3D sizeof(int)) { int instr; =20 - if (probe_user_read(&instr, (void __user *)pc, sizeof(instr))) { + if (copy_from_user_nofault(&instr, (void __user *)pc, + sizeof(instr))) { seq_buf_printf(&s, "XXXXXXXX "); continue; } diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/bo= ok3s_64_mmu_radix.c index aa12cd4078b32..9d25f2eb5a33a 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -64,9 +64,9 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid,= int pid, isync(); =20 if (is_load) - ret =3D probe_user_read(to, (const void __user *)from, n); + ret =3D copy_from_user_nofault(to, (const void __user *)from, n); else - ret =3D probe_user_write((void __user *)to, from, n); + ret =3D copy_to_user_nofault((void __user *)to, from, n); =20 /* switch the pid first to avoid running host with unallocated pid */ if (quadrant =3D=3D 1 && pid !=3D old_pid) diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 84af6c8eecf71..231664fe9d126 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -280,7 +280,7 @@ static bool bad_stack_expansion(struct pt_regs *regs,= unsigned long address, access_ok(nip, sizeof(*nip))) { unsigned int inst; =20 - if (!probe_user_read(&inst, nip, sizeof(inst))) + if (!copy_from_user_nofault(&inst, nip, sizeof(inst))) return !store_updates_sp(inst); *must_retry =3D true; } diff --git a/arch/powerpc/oprofile/backtrace.c b/arch/powerpc/oprofile/ba= cktrace.c index 6f347fa29f41e..9db7ada79d10d 100644 --- a/arch/powerpc/oprofile/backtrace.c +++ b/arch/powerpc/oprofile/backtrace.c @@ -33,7 +33,8 @@ static unsigned int user_getsp32(unsigned int sp, int i= s_first) * which means that we've done all that we can do from * interrupt context. */ - if (probe_user_read(stack_frame, (void __user *)p, sizeof(stack_frame))= ) + if (copy_from_user_nofault(stack_frame, (void __user *)p, + sizeof(stack_frame))) return 0; =20 if (!is_first) @@ -51,7 +52,8 @@ static unsigned long user_getsp64(unsigned long sp, int= is_first) { unsigned long stack_frame[3]; =20 - if (probe_user_read(stack_frame, (void __user *)sp, sizeof(stack_frame)= )) + if (copy_from_user_nofault(stack_frame, (void __user *)sp, + sizeof(stack_frame))) return 0; =20 if (!is_first) diff --git a/arch/powerpc/perf/callchain_32.c b/arch/powerpc/perf/callcha= in_32.c index 8aa9510031415..2e21849f82b18 100644 --- a/arch/powerpc/perf/callchain_32.c +++ b/arch/powerpc/perf/callchain_32.c @@ -45,7 +45,7 @@ static int read_user_stack_32(unsigned int __user *ptr,= unsigned int *ret) ((unsigned long)ptr & 3)) return -EFAULT; =20 - rc =3D probe_user_read(ret, ptr, sizeof(*ret)); + rc =3D copy_from_user_nofault(ret, ptr, sizeof(*ret)); =20 if (IS_ENABLED(CONFIG_PPC64) && rc) return read_user_stack_slow(ptr, ret, 4); diff --git a/arch/powerpc/perf/callchain_64.c b/arch/powerpc/perf/callcha= in_64.c index df1ffd8b20f21..7b0121694ebb7 100644 --- a/arch/powerpc/perf/callchain_64.c +++ b/arch/powerpc/perf/callchain_64.c @@ -71,7 +71,7 @@ static int read_user_stack_64(unsigned long __user *ptr= , unsigned long *ret) ((unsigned long)ptr & 7)) return -EFAULT; =20 - if (!probe_user_read(ret, ptr, sizeof(*ret))) + if (!copy_from_user_nofault(ret, ptr, sizeof(*ret))) return 0; =20 return read_user_stack_slow(ptr, ret, 8); diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-boo= k3s.c index 50bc9f0eb6be3..f8072d1e5d172 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -426,7 +426,8 @@ static __u64 power_pmu_bhrb_to(u64 addr) } =20 /* Userspace: need copy instruction here then translate it */ - if (probe_user_read(&instr, (unsigned int __user *)addr, sizeof(instr))= ) + if (copy_from_user_nofault(&instr, (unsigned int __user *)addr, + sizeof(instr))) return 0; =20 target =3D branch_target(&instr); diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.= c index 4a8874bc10574..73fa37ca40ef9 100644 --- a/arch/powerpc/sysdev/fsl_pci.c +++ b/arch/powerpc/sysdev/fsl_pci.c @@ -1066,8 +1066,8 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs) =20 if (is_in_pci_mem_space(addr)) { if (user_mode(regs)) - ret =3D probe_user_read(&inst, (void __user *)regs->nip, - sizeof(inst)); + ret =3D copy_from_user_nofault(&inst, + (void __user *)regs->nip, sizeof(inst)); else ret =3D probe_kernel_address((void *)regs->nip, inst); =20 diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 329e8479798de..5214d2f1f2cef 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -306,8 +306,8 @@ bool copy_from_kernel_nofault_allowed(const void *uns= afe_src, size_t size); long copy_from_kernel_nofault(void *dst, const void *src, size_t size); long notrace copy_to_kernel_nofault(void *dst, const void *src, size_t s= ize); =20 -extern long probe_user_read(void *dst, const void __user *src, size_t si= ze); -extern long notrace probe_user_write(void __user *dst, const void *src, +long copy_from_user_nofault(void *dst, const void __user *src, size_t si= ze); +long notrace copy_to_user_nofault(void __user *dst, const void *src, size_t size); =20 long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 59fec6e226db7..580ceefe23059 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -141,7 +141,7 @@ bpf_probe_read_user_common(void *dst, u32 size, const= void __user *unsafe_ptr) { int ret; =20 - ret =3D probe_user_read(dst, unsafe_ptr, size); + ret =3D copy_from_user_nofault(dst, unsafe_ptr, size); if (unlikely(ret < 0)) memset(dst, 0, size); return ret; @@ -326,7 +326,7 @@ BPF_CALL_3(bpf_probe_write_user, void __user *, unsaf= e_ptr, const void *, src, if (unlikely(!nmi_uaccess_okay())) return -EPERM; =20 - return probe_user_write(unsafe_ptr, src, size); + return copy_to_user_nofault(unsafe_ptr, src, size); } =20 static const struct bpf_func_proto bpf_probe_write_user_proto =3D { diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 430e64c4117ee..af4dd69bcc398 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1290,7 +1290,7 @@ probe_mem_read_user(void *dest, void *src, size_t s= ize) { const void __user *uaddr =3D (__force const void __user *)src; =20 - return probe_user_read(dest, uaddr, size); + return copy_from_user_nofault(dest, uaddr, size); } =20 static nokprobe_inline int diff --git a/mm/maccess.c b/mm/maccess.c index 43ed419f38401..349b6cb14426c 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -192,7 +192,7 @@ long strncpy_from_kernel_nofault(char *dst, const voi= d *unsafe_addr, long count) #endif /* HAVE_GET_KERNEL_NOFAULT */ =20 /** - * probe_user_read(): safely attempt to read from a user-space location + * copy_from_user_nofault(): safely attempt to read from a user-space lo= cation * @dst: pointer to the buffer that shall take the data * @src: address to read from. This must be a user address. * @size: size of the data chunk @@ -200,7 +200,7 @@ long strncpy_from_kernel_nofault(char *dst, const voi= d *unsafe_addr, long count) * Safely read from user address @src to the buffer at @dst. If a kernel= fault * happens, handle that and return -EFAULT. */ -long probe_user_read(void *dst, const void __user *src, size_t size) +long copy_from_user_nofault(void *dst, const void __user *src, size_t si= ze) { long ret =3D -EFAULT; mm_segment_t old_fs =3D get_fs(); @@ -217,10 +217,10 @@ long probe_user_read(void *dst, const void __user *= src, size_t size) return -EFAULT; return 0; } -EXPORT_SYMBOL_GPL(probe_user_read); +EXPORT_SYMBOL_GPL(copy_from_user_nofault); =20 /** - * probe_user_write(): safely attempt to write to a user-space location + * copy_to_user_nofault(): safely attempt to write to a user-space locat= ion * @dst: address to write to * @src: pointer to the data that shall be written * @size: size of the data chunk @@ -228,7 +228,7 @@ EXPORT_SYMBOL_GPL(probe_user_read); * Safely write to address @dst from the buffer at @src. If a kernel fa= ult * happens, handle that and return -EFAULT. */ -long probe_user_write(void __user *dst, const void *src, size_t size) +long copy_to_user_nofault(void __user *dst, const void *src, size_t size= ) { long ret =3D -EFAULT; mm_segment_t old_fs =3D get_fs(); --=20 2.26.2