[22/23] maccess: rename probe_kernel_address to get_kernel_nofault

Message ID	20200521152301.2587579-23-hch@lst.de (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=Ax4L=7D=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A387207D8 From: Christoph Hellwig <hch@lst.de> To: x86@kernel.org, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Masami Hiramatsu <mhiramat@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org> 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 22/23] maccess: rename probe_kernel_address to get_kernel_nofault Date: Thu, 21 May 2020 17:23:00 +0200 Message-Id: <20200521152301.2587579-23-hch@lst.de> In-Reply-To: <20200521152301.2587579-1-hch@lst.de> References: <20200521152301.2587579-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	[01/23] maccess: unexport probe_kernel_write and probe_user_write \| expand [01/23] maccess: unexport probe_kernel_write and probe_user_write [02/23] maccess: remove various unused weak aliases [03/23] maccess: remove duplicate kerneldoc comments [04/23] maccess: clarify kerneldoc comments [05/23] maccess: update the top of file comment [06/23] maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault [07/23] maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault [08/23] maccess: rename strnlen_unsafe_user to strnlen_user_nofault [09/23] maccess: remove probe_read_common and probe_write_common [10/23] maccess: unify the probe kernel arch hooks [11/23] bpf: factor out a bpf_trace_copy_string helper [12/23] bpf: handle the compat string in bpf_trace_copy_string better [13/23] bpf: rework the compat kernel probe handling [14/23] tracing/kprobes: handle mixed kernel/userspace probes better [15/23] maccess: remove strncpy_from_unsafe [16/23] maccess: always use strict semantics for probe_kernel_read [17/23] maccess: move user access routines together [18/23] maccess: allow architectures to provide kernel probing directly [19/23] x86: use non-set_fs based maccess routines [20/23] maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault [21/23] maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault [22/23] maccess: rename probe_kernel_address to get_kernel_nofault [23/23] maccess: return -ERANGE when copy_from_kernel_nofault_allowed fails

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 1e70e7227f0ff..61b91872b3e74 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -391,7 +391,7 @@ int is_valid_bugaddr(unsigned long pc) u32 insn = __opcode_to_mem_arm(BUG_INSTR_VALUE); #endif - if (probe_kernel_address((unsigned *)pc, bkpt)) + if (get_kernel_nofault((unsigned *)pc, bkpt)) return 0; return bkpt == insn; diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c index 84718eddae603..236016f13bcd3 100644 --- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -774,7 +774,7 @@ static int alignment_get_arm(struct pt_regs *regs, u32 *ip, u32 *inst) if (user_mode(regs)) fault = get_user(instr, ip); else - fault = probe_kernel_address(ip, instr); + fault = get_kernel_nofault(ip, instr); *inst = __mem_to_opcode_arm(instr); @@ -789,7 +789,7 @@ static int alignment_get_thumb(struct pt_regs *regs, u16 *ip, u16 *inst) if (user_mode(regs)) fault = get_user(instr, ip); else - fault = probe_kernel_address(ip, instr); + fault = get_kernel_nofault(ip, instr); *inst = __mem_to_opcode_thumb16(instr); diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index cf402be5c573f..2245af23973a2 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -315,7 +315,7 @@ static int call_undef_hook(struct pt_regs *regs) if (!user_mode(regs)) { __le32 instr_le; - if (probe_kernel_address((__force __le32 *)pc, instr_le)) + if (get_kernel_nofault((__force __le32 *)pc, instr_le)) goto exit; instr = le32_to_cpu(instr_le); } else if (compat_thumb_mode(regs)) { diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h index cea15f2dd38df..ef03eec8666f8 100644 --- a/arch/ia64/include/asm/sections.h +++ b/arch/ia64/include/asm/sections.h @@ -35,7 +35,7 @@ static inline void *dereference_function_descriptor(void *ptr) struct fdesc *desc = ptr; void *p; - if (!probe_kernel_address(&desc->ip, p)) + if (!get_kernel_nofault(&desc->ip, p)) ptr = p; return ptr; } diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index 230a6422b99f3..c3b0f03bd0bf1 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -293,7 +293,7 @@ void *dereference_function_descriptor(void *ptr) Elf64_Fdesc *desc = ptr; void *p; - if (!probe_kernel_address(&desc->addr, p)) + if (!get_kernel_nofault(&desc->addr, p)) ptr = p; return ptr; } diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h index d19871763ed4a..636bb1633de18 100644 --- a/arch/powerpc/include/asm/sections.h +++ b/arch/powerpc/include/asm/sections.h @@ -85,7 +85,7 @@ static inline void *dereference_function_descriptor(void *ptr) struct ppc64_opd_entry *desc = ptr; void *p; - if (!probe_kernel_address(&desc->funcaddr, p)) + if (!get_kernel_nofault(&desc->funcaddr, p)) ptr = p; return ptr; } diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c index 7dd55eb1259dc..f0045a74e7cea 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -420,7 +420,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) unsigned int instr; unsigned int *addr = (unsigned int *)bpt->bpt_addr; - err = probe_kernel_address(addr, instr); + err = get_kernel_nofault(addr, instr); if (err) return err; diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index d5d6136b13480..b77f97073200c 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1260,7 +1260,7 @@ static void show_instructions(struct pt_regs *regs) #endif if (!__kernel_text_address(pc) || - probe_kernel_address((const void *)pc, instr)) { + get_kernel_nofault((const void *)pc, instr)) { pr_cont("XXXXXXXX "); } else { if (regs->nip == pc) diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c index 73fa37ca40ef9..483412d5a1973 100644 --- a/arch/powerpc/sysdev/fsl_pci.c +++ b/arch/powerpc/sysdev/fsl_pci.c @@ -1069,7 +1069,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs) ret = copy_from_user_nofault(&inst, (void __user *)regs->nip, sizeof(inst)); else - ret = probe_kernel_address((void *)regs->nip, inst); + ret = get_kernel_nofault((void *)regs->nip, inst); if (!ret && mcheck_handle_load(regs, inst)) { regs->nip += 4; diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 7f58fa53033f6..d807d507bd95a 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -137,7 +137,7 @@ static inline unsigned long get_break_insn_length(unsigned long pc) { bug_insn_t insn; - if (probe_kernel_address((bug_insn_t *)pc, insn)) + if (get_kernel_nofault((bug_insn_t *)pc, insn)) return 0; return GET_INSN_LENGTH(insn); @@ -160,7 +160,7 @@ int is_valid_bugaddr(unsigned long pc) if (pc < VMALLOC_START) return 0; - if (probe_kernel_address((bug_insn_t *)pc, insn)) + if (get_kernel_nofault((bug_insn_t *)pc, insn)) return 0; if ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) return (insn == __BUG_INSN_32); diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index dedc28be27ab4..ab68eca6b2480 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -106,7 +106,7 @@ static int bad_address(void *p) { unsigned long dummy; - return probe_kernel_address((unsigned long *)p, dummy); + return get_kernel_nofault((unsigned long *)p, dummy); } static void dump_pagetable(unsigned long asce, unsigned long address) diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c index 63cf17bc760da..27c53c5b84e6b 100644 --- a/arch/sh/kernel/traps.c +++ b/arch/sh/kernel/traps.c @@ -118,7 +118,7 @@ int is_valid_bugaddr(unsigned long addr) if (addr < PAGE_OFFSET) return 0; - if (probe_kernel_address((insn_size_t *)addr, opcode)) + if (get_kernel_nofault((insn_size_t *)addr, opcode)) return 0; if (opcode == TRAPA_BUG_OPCODE) return 1; diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c index ee0286390a4c1..77f3341570e84 100644 --- a/arch/x86/kernel/probe_roms.c +++ b/arch/x86/kernel/probe_roms.c @@ -99,7 +99,7 @@ static bool probe_list(struct pci_dev *pdev, unsigned short vendor, unsigned short device; do { - if (probe_kernel_address(rom_list, device) != 0) + if (get_kernel_nofault(rom_list, device) != 0) device = 0; if (device && match_id(pdev, vendor, device)) @@ -125,13 +125,13 @@ static struct resource *find_oprom(struct pci_dev *pdev) break; rom = isa_bus_to_virt(res->start); - if (probe_kernel_address(rom + 0x18, offset) != 0) + if (get_kernel_nofault(rom + 0x18, offset) != 0) continue; - if (probe_kernel_address(rom + offset + 0x4, vendor) != 0) + if (get_kernel_nofault(rom + offset + 0x4, vendor) != 0) continue; - if (probe_kernel_address(rom + offset + 0x6, device) != 0) + if (get_kernel_nofault(rom + offset + 0x6, device) != 0) continue; if (match_id(pdev, vendor, device)) { @@ -139,8 +139,8 @@ static struct resource *find_oprom(struct pci_dev *pdev) break; } - if (probe_kernel_address(rom + offset + 0x8, list) == 0 && - probe_kernel_address(rom + offset + 0xc, rev) == 0 && + if (get_kernel_nofault(rom + offset + 0x8, list) == 0 && + get_kernel_nofault(rom + offset + 0xc, rev) == 0 && rev >= 3 && list && probe_list(pdev, vendor, rom + offset + list)) { oprom = res; @@ -183,14 +183,14 @@ static int __init romsignature(const unsigned char *rom) const unsigned short * const ptr = (const unsigned short *)rom; unsigned short sig; - return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE; + return get_kernel_nofault(ptr, sig) == 0 && sig == ROMSIGNATURE; } static int __init romchecksum(const unsigned char *rom, unsigned long length) { unsigned char sum, c; - for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--) + for (sum = 0; length && get_kernel_nofault(rom++, c) == 0; length--) sum += c; return !length && !sum; } @@ -211,7 +211,7 @@ void __init probe_roms(void) video_rom_resource.start = start; - if (probe_kernel_address(rom + 2, c) != 0) + if (get_kernel_nofault(rom + 2, c) != 0) continue; /* 0 < length <= 0x7f * 512, historically */ @@ -249,7 +249,7 @@ void __init probe_roms(void) if (!romsignature(rom)) continue; - if (probe_kernel_address(rom + 2, c) != 0) + if (get_kernel_nofault(rom + 2, c) != 0) continue; /* 0 < length <= 0x7f * 512, historically */ diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 96809f6aad67d..07739b67da335 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -161,7 +161,7 @@ int is_valid_bugaddr(unsigned long addr) if (addr < TASK_SIZE_MAX) return 0; - if (probe_kernel_address((unsigned short *)addr, ud)) + if (get_kernel_nofault((unsigned short *)addr, ud)) return 0; return ud == INSN_UD0 || ud == INSN_UD2; diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 994e207abdf64..7c5e23e7407d8 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -98,7 +98,7 @@ check_prefetch_opcode(struct pt_regs *regs, unsigned char *instr, return !instr_lo || (instr_lo>>1) == 1; case 0x00: /* Prefetch instruction is 0x0F0D or 0x0F18 */ - if (probe_kernel_address(instr, opcode)) + if (get_kernel_nofault(instr, opcode)) return 0; *prefetch = (instr_lo == 0xF) && @@ -132,7 +132,7 @@ is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr) while (instr < max_instr) { unsigned char opcode; - if (probe_kernel_address(instr, opcode)) + if (get_kernel_nofault(instr, opcode)) break; instr++; @@ -441,7 +441,7 @@ static int bad_address(void *p) { unsigned long dummy; - return probe_kernel_address((unsigned long *)p, dummy); + return get_kernel_nofault((unsigned long *)p, dummy); } static void dump_pagetable(unsigned long address) diff --git a/arch/x86/pci/pcbios.c b/arch/x86/pci/pcbios.c index 9c97d814125eb..b7f8699b18c1f 100644 --- a/arch/x86/pci/pcbios.c +++ b/arch/x86/pci/pcbios.c @@ -302,7 +302,7 @@ static const struct pci_raw_ops *__init pci_find_bios(void) check <= (union bios32 *) __va(0xffff0); ++check) { long sig; - if (probe_kernel_address(&check->fields.signature, sig)) + if (get_kernel_nofault(&check->fields.signature, sig)) continue; if (check->fields.signature != BIOS32_SIGNATURE) diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 5214d2f1f2cef..73b79f06cad8b 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -318,13 +318,13 @@ long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr, long strnlen_user_nofault(const void __user *unsafe_addr, long count); /** - * probe_kernel_address(): safely attempt to read from a location + * get_kernel_nofault(): safely attempt to read from a location * @addr: address to read from * @retval: read into this variable * * Returns 0 on success, or -EFAULT. */ -#define probe_kernel_address(addr, retval) \ +#define get_kernel_nofault(addr, retval) \ copy_from_kernel_nofault(&retval, addr, sizeof(retval)) #ifndef user_access_begin diff --git a/lib/test_lockup.c b/lib/test_lockup.c index ea09ca335b214..71f7a4c89ed4f 100644 --- a/lib/test_lockup.c +++ b/lib/test_lockup.c @@ -419,8 +419,8 @@ static bool test_kernel_ptr(unsigned long addr, int size) /* should be at least readable kernel address */ if (access_ok(ptr, 1) || access_ok(ptr + size - 1, 1) || - probe_kernel_address(ptr, buf) || - probe_kernel_address(ptr + size - 1, buf)) { + get_kernel_nofault(ptr, buf) || + get_kernel_nofault(ptr + size - 1, buf)) { pr_err("invalid kernel ptr: %#lx\n", addr); return true; } @@ -437,7 +437,7 @@ static bool __maybe_unused test_magic(unsigned long addr, int offset, if (!addr) return false; - if (probe_kernel_address(ptr, magic) || magic != expected) { + if (get_kernel_nofault(ptr, magic) || magic != expected) { pr_err("invalid magic at %#lx + %#x = %#x, expected %#x\n", addr, offset, magic, expected); return true;

[22/23] maccess: rename probe_kernel_address to get_kernel_nofault

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