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maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault

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Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2020-06-17 09:37:53 +02:00 committed by Linus Torvalds
parent b3a9e3b962
commit fe557319aa
50 changed files with 138 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/kernel/ftrace.c
View File

@ -84,7 +84,8 @@ static int ftrace_modify_code(unsigned long pc, unsigned long old,
old = __opcode_to_mem_arm(old);
if (validate) {
if (probe_kernel_read(&replaced, (void *)pc, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(&replaced, (void *)pc,
MCOUNT_INSN_SIZE))
return -EFAULT;
if (replaced != old)

2
arch/arm/kernel/kgdb.c
View File

@ -236,7 +236,7 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
/* patch_text() only supports int-sized breakpoints */
BUILD_BUG_ON(sizeof(int) != BREAK_INSTR_SIZE);
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;

4
arch/arm64/kernel/insn.c
View File

@ -135,7 +135,7 @@ int __kprobes aarch64_insn_read(void *addr, u32 *insnp)
int ret;
__le32 val;
ret = probe_kernel_read(&val, addr, AARCH64_INSN_SIZE);
ret = copy_from_kernel_nofault(&val, addr, AARCH64_INSN_SIZE);
if (!ret)
*insnp = le32_to_cpu(val);
@ -151,7 +151,7 @@ static int __kprobes __aarch64_insn_write(void *addr, __le32 insn)
raw_spin_lock_irqsave(&patch_lock, flags);
waddr = patch_map(addr, FIX_TEXT_POKE0);
ret = probe_kernel_write(waddr, &insn, AARCH64_INSN_SIZE);
ret = copy_to_kernel_nofault(waddr, &insn, AARCH64_INSN_SIZE);
patch_unmap(FIX_TEXT_POKE0);
raw_spin_unlock_irqrestore(&patch_lock, flags);

5
arch/csky/kernel/ftrace.c
View File

@ -72,7 +72,8 @@ static int ftrace_check_current_nop(unsigned long hook)
uint16_t olds[7];
unsigned long hook_pos = hook - 2;
if (probe_kernel_read((void *)olds, (void *)hook_pos, sizeof(nops)))
if (copy_from_kernel_nofault((void *)olds, (void *)hook_pos,
sizeof(nops)))
return -EFAULT;
if (memcmp((void *)nops, (void *)olds, sizeof(nops))) {
@ -97,7 +98,7 @@ static int ftrace_modify_code(unsigned long hook, unsigned long target,
make_jbsr(target, hook, call, nolr);
ret = probe_kernel_write((void *)hook_pos, enable ? call : nops,
ret = copy_to_kernel_nofault((void *)hook_pos, enable ? call : nops,
sizeof(nops));
if (ret)
return -EPERM;

6
arch/ia64/kernel/ftrace.c
View File

@ -108,7 +108,7 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
goto skip_check;
/* read the text we want to modify */
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
/* Make sure it is what we expect it to be */
@ -117,7 +117,7 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
skip_check:
/* replace the text with the new text */
if (probe_kernel_write(((void *)ip), new_code, MCOUNT_INSN_SIZE))
if (copy_to_kernel_nofault(((void *)ip), new_code, MCOUNT_INSN_SIZE))
return -EPERM;
flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);
@ -129,7 +129,7 @@ static int ftrace_make_nop_check(struct dyn_ftrace *rec, unsigned long addr)
unsigned char __attribute__((aligned(8))) replaced[MCOUNT_INSN_SIZE];
unsigned long ip = rec->ip;
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
if (rec->flags & FTRACE_FL_CONVERTED) {
struct ftrace_call_insn *call_insn, *tmp_call;

6
arch/mips/kernel/kprobes.c
View File

@ -86,9 +86,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
goto out;
}
if ((probe_kernel_read(&prev_insn, p->addr - 1,
sizeof(mips_instruction)) == 0) &&
insn_has_delayslot(prev_insn)) {
if (copy_from_kernel_nofault(&prev_insn, p->addr - 1,
sizeof(mips_instruction)) == 0 &&
insn_has_delayslot(prev_insn)) {
pr_notice("Kprobes for branch delayslot are not supported\n");
ret = -EINVAL;
goto out;

5
arch/nds32/kernel/ftrace.c
View File

@ -131,13 +131,14 @@ static int __ftrace_modify_code(unsigned long pc, unsigned long *old_insn,
unsigned long orig_insn[3];
if (validate) {
if (probe_kernel_read(orig_insn, (void *)pc, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(orig_insn, (void *)pc,
MCOUNT_INSN_SIZE))
return -EFAULT;
if (memcmp(orig_insn, old_insn, MCOUNT_INSN_SIZE))
return -EINVAL;
}
if (probe_kernel_write((void *)pc, new_insn, MCOUNT_INSN_SIZE))
if (copy_to_kernel_nofault((void *)pc, new_insn, MCOUNT_INSN_SIZE))
return -EPERM;
return 0;

2
arch/parisc/kernel/ftrace.c
View File

@ -172,7 +172,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
ip = (void *)(rec->ip + 4 - size);
ret = probe_kernel_read(insn, ip, size);
ret = copy_from_kernel_nofault(insn, ip, size);
if (ret)
return ret;

4
arch/parisc/kernel/kgdb.c
View File

@ -154,8 +154,8 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int ret = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
int ret = copy_from_kernel_nofault(bpt->saved_instr,
(char *)bpt->bpt_addr, BREAK_INSTR_SIZE);
if (ret)
return ret;

2
arch/parisc/lib/memcpy.c
View File

@ -57,7 +57,7 @@ void * memcpy(void * dst,const void *src, size_t count)
EXPORT_SYMBOL(raw_copy_in_user);
EXPORT_SYMBOL(memcpy);
bool probe_kernel_read_allowed(const void *unsafe_src, size_t size)
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
if ((unsigned long)unsafe_src < PAGE_SIZE)
return false;

6
arch/powerpc/kernel/module_64.c
View File

@ -756,7 +756,8 @@ int module_trampoline_target(struct module *mod, unsigned long addr,
stub = (struct ppc64_stub_entry *)addr;
if (probe_kernel_read(&magic, &stub->magic, sizeof(magic))) {
if (copy_from_kernel_nofault(&magic, &stub->magic,
sizeof(magic))) {
pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);
return -EFAULT;
}
@ -766,7 +767,8 @@ int module_trampoline_target(struct module *mod, unsigned long addr,
return -EFAULT;
}
if (probe_kernel_read(&funcdata, &stub->funcdata, sizeof(funcdata))) {
if (copy_from_kernel_nofault(&funcdata, &stub->funcdata,
sizeof(funcdata))) {
pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);
return -EFAULT;
}

4
arch/powerpc/kernel/trace/ftrace.c
View File

@ -226,7 +226,7 @@ __ftrace_make_nop(struct module *mod,
unsigned long ip = rec->ip;
unsigned long tramp;
if (probe_kernel_read(&op, (void *)ip, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(&op, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
/* Make sure that that this is still a 24bit jump */
@ -249,7 +249,7 @@ __ftrace_make_nop(struct module *mod,
pr_devel("ip:%lx jumps to %lx", ip, tramp);
/* Find where the trampoline jumps to */
if (probe_kernel_read(jmp, (void *)tramp, sizeof(jmp))) {
if (copy_from_kernel_nofault(jmp, (void *)tramp, sizeof(jmp))) {
pr_err("Failed to read %lx\n", tramp);
return -EFAULT;
}

6
arch/powerpc/lib/inst.c
View File

@ -33,11 +33,11 @@ int probe_kernel_read_inst(struct ppc_inst *inst,
unsigned int val, suffix;
int err;
err = probe_kernel_read(&val, src, sizeof(val));
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (err)
return err;
if (get_op(val) == OP_PREFIX) {
err = probe_kernel_read(&suffix, (void *)src + 4, 4);
err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
*inst = ppc_inst_prefix(val, suffix);
} else {
*inst = ppc_inst(val);
@ -64,7 +64,7 @@ int probe_kernel_read_inst(struct ppc_inst *inst,
unsigned int val;
int err;
err = probe_kernel_read(&val, src, sizeof(val));
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (!err)
*inst = ppc_inst(val);

3
arch/powerpc/perf/core-book3s.c
View File

@ -418,7 +418,8 @@ static __u64 power_pmu_bhrb_to(u64 addr)
__u64 target;
if (is_kernel_addr(addr)) {
if (probe_kernel_read(&instr, (void *)addr, sizeof(instr)))
if (copy_from_kernel_nofault(&instr, (void *)addr,
sizeof(instr)))
return 0;
return branch_target((struct ppc_inst *)&instr);

3
arch/riscv/kernel/ftrace.c
View File

@ -38,7 +38,8 @@ static int ftrace_check_current_call(unsigned long hook_pos,
* Read the text we want to modify;
* return must be -EFAULT on read error
*/
if (probe_kernel_read(replaced, (void *)hook_pos, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(replaced, (void *)hook_pos,
MCOUNT_INSN_SIZE))
return -EFAULT;
/*

4
arch/riscv/kernel/kgdb.c
View File

@ -153,7 +153,7 @@ int do_single_step(struct pt_regs *regs)
stepped_address = addr;
/* Replace the op code with the break instruction */
error = probe_kernel_write((void *)stepped_address,
error = copy_to_kernel_nofault((void *)stepped_address,
arch_kgdb_ops.gdb_bpt_instr,
BREAK_INSTR_SIZE);
/* Flush and return */
@ -173,7 +173,7 @@ int do_single_step(struct pt_regs *regs)
static void undo_single_step(struct pt_regs *regs)
{
if (stepped_opcode != 0) {
probe_kernel_write((void *)stepped_address,
copy_to_kernel_nofault((void *)stepped_address,
(void *)&stepped_opcode, BREAK_INSTR_SIZE);
flush_icache_range(stepped_address,
stepped_address + BREAK_INSTR_SIZE);

4
arch/riscv/kernel/patch.c
View File

@ -63,7 +63,7 @@ static int patch_insn_write(void *addr, const void *insn, size_t len)
waddr = patch_map(addr, FIX_TEXT_POKE0);
ret = probe_kernel_write(waddr, insn, len);
ret = copy_to_kernel_nofault(waddr, insn, len);
patch_unmap(FIX_TEXT_POKE0);
@ -76,7 +76,7 @@ NOKPROBE_SYMBOL(patch_insn_write);
#else
static int patch_insn_write(void *addr, const void *insn, size_t len)
{
return probe_kernel_write(addr, insn, len);
return copy_to_kernel_nofault(addr, insn, len);
}
NOKPROBE_SYMBOL(patch_insn_write);
#endif /* CONFIG_MMU */

4
arch/s390/kernel/ftrace.c
View File

@ -83,7 +83,7 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
{
struct ftrace_insn orig, new, old;
if (probe_kernel_read(&old, (void *) rec->ip, sizeof(old)))
if (copy_from_kernel_nofault(&old, (void *) rec->ip, sizeof(old)))
return -EFAULT;
if (addr == MCOUNT_ADDR) {
/* Initial code replacement */
@ -105,7 +105,7 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
struct ftrace_insn orig, new, old;
if (probe_kernel_read(&old, (void *) rec->ip, sizeof(old)))
if (copy_from_kernel_nofault(&old, (void *) rec->ip, sizeof(old)))
return -EFAULT;
/* Replace nop with an ftrace call. */
ftrace_generate_nop_insn(&orig);

6
arch/sh/kernel/ftrace.c
View File

@ -119,7 +119,7 @@ static void ftrace_mod_code(void)
* But if one were to fail, then they all should, and if one were
* to succeed, then they all should.
*/
mod_code_status = probe_kernel_write(mod_code_ip, mod_code_newcode,
mod_code_status = copy_to_kernel_nofault(mod_code_ip, mod_code_newcode,
MCOUNT_INSN_SIZE);
/* if we fail, then kill any new writers */
@ -203,7 +203,7 @@ static int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
*/
/* read the text we want to modify */
if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
/* Make sure it is what we expect it to be */
@ -268,7 +268,7 @@ static int ftrace_mod(unsigned long ip, unsigned long old_addr,
{
unsigned char code[MCOUNT_INSN_SIZE];
if (probe_kernel_read(code, (void *)ip, MCOUNT_INSN_SIZE))
if (copy_from_kernel_nofault(code, (void *)ip, MCOUNT_INSN_SIZE))
return -EFAULT;
if (old_addr != __raw_readl((unsigned long *)code))

2
arch/um/kernel/maccess.c
View File

@ -7,7 +7,7 @@
#include <linux/kernel.h>
#include <os.h>
bool probe_kernel_read_allowed(const void *src, size_t size)
bool copy_from_kernel_nofault_allowed(const void *src, size_t size)
{
void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);

4
arch/x86/include/asm/ptrace.h
View File

@ -278,7 +278,7 @@ static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs
}
/* To avoid include hell, we can't include uaccess.h */
extern long probe_kernel_read(void *dst, const void *src, size_t size);
extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size);
/**
* regs_get_kernel_stack_nth() - get Nth entry of the stack
@ -298,7 +298,7 @@ static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
addr = regs_get_kernel_stack_nth_addr(regs, n);
if (addr) {
ret = probe_kernel_read(&val, addr, sizeof(val));
ret = copy_from_kernel_nofault(&val, addr, sizeof(val));
if (!ret)
return val;
}

2
arch/x86/kernel/dumpstack.c
View File

@ -106,7 +106,7 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl)
bad_ip = user_mode(regs) &&
__chk_range_not_ok(prologue, OPCODE_BUFSIZE, TASK_SIZE_MAX);
if (bad_ip || probe_kernel_read(opcodes, (u8 *)prologue,
if (bad_ip || copy_from_kernel_nofault(opcodes, (u8 *)prologue,
OPCODE_BUFSIZE)) {
printk("%sCode: Bad RIP value.\n", loglvl);
} else {

10
arch/x86/kernel/ftrace.c
View File

@ -86,7 +86,7 @@ static int ftrace_verify_code(unsigned long ip, const char *old_code)
* sure what we read is what we expected it to be before modifying it.
*/
/* read the text we want to modify */
if (probe_kernel_read(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
if (copy_from_kernel_nofault(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
WARN_ON(1);
return -EFAULT;
}
@ -355,7 +355,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
npages = DIV_ROUND_UP(*tramp_size, PAGE_SIZE);
/* Copy ftrace_caller onto the trampoline memory */
ret = probe_kernel_read(trampoline, (void *)start_offset, size);
ret = copy_from_kernel_nofault(trampoline, (void *)start_offset, size);
if (WARN_ON(ret < 0))
goto fail;
@ -363,13 +363,13 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
/* The trampoline ends with ret(q) */
retq = (unsigned long)ftrace_stub;
ret = probe_kernel_read(ip, (void *)retq, RET_SIZE);
ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
if (WARN_ON(ret < 0))
goto fail;
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS) {
ip = trampoline + (ftrace_regs_caller_ret - ftrace_regs_caller);
ret = probe_kernel_read(ip, (void *)retq, RET_SIZE);
ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
if (WARN_ON(ret < 0))
goto fail;
}
@ -506,7 +506,7 @@ static void *addr_from_call(void *ptr)
union text_poke_insn call;
int ret;
ret = probe_kernel_read(&call, ptr, CALL_INSN_SIZE);
ret = copy_from_kernel_nofault(&call, ptr, CALL_INSN_SIZE);
if (WARN_ON_ONCE(ret < 0))
return NULL;

6
arch/x86/kernel/kgdb.c
View File

@ -732,11 +732,11 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
int err;
bpt->type = BP_BREAKPOINT;
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
err = probe_kernel_write((char *)bpt->bpt_addr,
err = copy_to_kernel_nofault((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
if (!err)
return err;
@ -768,7 +768,7 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
return 0;
knl_write:
return probe_kernel_write((char *)bpt->bpt_addr,
return copy_to_kernel_nofault((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}

5
arch/x86/kernel/kprobes/core.c
View File

@ -243,7 +243,7 @@ __recover_probed_insn(kprobe_opcode_t *buf, unsigned long addr)
* Fortunately, we know that the original code is the ideal 5-byte
* long NOP.
*/
if (probe_kernel_read(buf, (void *)addr,
if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;
@ -346,7 +346,8 @@ int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn)
return 0;
/* This can access kernel text if given address is not recovered */
if (probe_kernel_read(dest, (void *)recovered_insn, MAX_INSN_SIZE))
if (copy_from_kernel_nofault(dest, (void *)recovered_insn,
MAX_INSN_SIZE))
return 0;
kernel_insn_init(insn, dest, MAX_INSN_SIZE);

2
arch/x86/kernel/kprobes/opt.c
View File

@ -56,7 +56,7 @@ found:
* overwritten by jump destination address. In this case, original
* bytes must be recovered from op->optinsn.copied_insn buffer.
*/
if (probe_kernel_read(buf, (void *)addr,
if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;

3
arch/x86/kernel/traps.c
View File

@ -488,7 +488,8 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
u8 insn_buf[MAX_INSN_SIZE];
struct insn insn;
if (probe_kernel_read(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,
MAX_INSN_SIZE))
return GP_NO_HINT;
kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);

2
arch/x86/mm/fault.c
View File

@ -442,7 +442,7 @@ static void show_ldttss(const struct desc_ptr *gdt, const char *name, u16 index)
return;
}
if (probe_kernel_read(&desc, (void *)(gdt->address + offset),
if (copy_from_kernel_nofault(&desc, (void *)(gdt->address + offset),
sizeof(struct ldttss_desc))) {
pr_alert("%s: 0x%hx -- GDT entry is not readable\n",
name, index);

2
arch/x86/mm/init_32.c
View File

@ -737,7 +737,7 @@ static void __init test_wp_bit(void)
__set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);
if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
if (copy_to_kernel_nofault((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
clear_fixmap(FIX_WP_TEST);
printk(KERN_CONT "Ok.\n");
return;

4
arch/x86/mm/maccess.c
View File

@ -9,7 +9,7 @@ static __always_inline u64 canonical_address(u64 vaddr, u8 vaddr_bits)
return ((s64)vaddr << (64 - vaddr_bits)) >> (64 - vaddr_bits);
}
bool probe_kernel_read_allowed(const void *unsafe_src, size_t size)
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
unsigned long vaddr = (unsigned long)unsafe_src;
@ -22,7 +22,7 @@ bool probe_kernel_read_allowed(const void *unsafe_src, size_t size)
canonical_address(vaddr, boot_cpu_data.x86_virt_bits) == vaddr;
}
#else
bool probe_kernel_read_allowed(const void *unsafe_src, size_t size)
bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
{
return (unsigned long)unsafe_src >= TASK_SIZE_MAX;
}

2
arch/x86/xen/enlighten_pv.c
View File

@ -386,7 +386,7 @@ static void set_aliased_prot(void *v, pgprot_t prot)
preempt_disable();
probe_kernel_read(&dummy, v, 1);
copy_from_kernel_nofault(&dummy, v, 1);
if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
BUG();

2
drivers/char/mem.c
View File

@ -171,7 +171,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
if (!ptr)
goto failed;
probe = probe_kernel_read(bounce, ptr, sz);
probe = copy_from_kernel_nofault(bounce, ptr, sz);
unxlate_dev_mem_ptr(p, ptr);
if (probe)
goto failed;

6
drivers/dio/dio.c
View File

@ -135,7 +135,8 @@ int __init dio_find(int deviceid)
else
va = ioremap(pa, PAGE_SIZE);
if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
if (copy_from_kernel_nofault(&i,
(unsigned char *)va + DIO_IDOFF, 1)) {
if (scode >= DIOII_SCBASE)
iounmap(va);
continue; /* no board present at that select code */
@ -208,7 +209,8 @@ static int __init dio_init(void)
else
va = ioremap(pa, PAGE_SIZE);
if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
if (copy_from_kernel_nofault(&i,
(unsigned char *)va + DIO_IDOFF, 1)) {
if (scode >= DIOII_SCBASE)
iounmap(va);
continue; /* no board present at that select code */

2
drivers/input/serio/hp_sdc.c
View File

@ -1021,7 +1021,7 @@ static int __init hp_sdc_register(void)
hp_sdc.base_io = (unsigned long) 0xf0428000;
hp_sdc.data_io = (unsigned long) hp_sdc.base_io + 1;
hp_sdc.status_io = (unsigned long) hp_sdc.base_io + 3;
if (!probe_kernel_read(&i, (unsigned char *)hp_sdc.data_io, 1))
if (!copy_from_kernel_nofault(&i, (unsigned char *)hp_sdc.data_io, 1))
hp_sdc.dev = (void *)1;
hp_sdc.dev_err = hp_sdc_init();
#endif

6
drivers/misc/kgdbts.c
View File

@ -828,7 +828,7 @@ static void run_plant_and_detach_test(int is_early)
char before[BREAK_INSTR_SIZE];
char after[BREAK_INSTR_SIZE];
probe_kernel_read(before, (char *)kgdbts_break_test,
copy_from_kernel_nofault(before, (char *)kgdbts_break_test,
BREAK_INSTR_SIZE);
init_simple_test();
ts.tst = plant_and_detach_test;
@ -836,8 +836,8 @@ static void run_plant_and_detach_test(int is_early)
/* Activate test with initial breakpoint */
if (!is_early)
kgdb_breakpoint();
probe_kernel_read(after, (char *)kgdbts_break_test,
BREAK_INSTR_SIZE);
copy_from_kernel_nofault(after, (char *)kgdbts_break_test,
BREAK_INSTR_SIZE);
if (memcmp(before, after, BREAK_INSTR_SIZE)) {
printk(KERN_CRIT "kgdbts: ERROR kgdb corrupted memory\n");
panic("kgdb memory corruption");

2
drivers/video/fbdev/hpfb.c
View File

@ -402,7 +402,7 @@ int __init hpfb_init(void)
if (err)
return err;
err = probe_kernel_read(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))

3
fs/proc/kcore.c
View File

@ -512,7 +512,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
* Using bounce buffer to bypass the
* hardened user copy kernel text checks.
*/
if (probe_kernel_read(buf, (void *) start, tsz)) {
if (copy_from_kernel_nofault(buf, (void *)start,
tsz)) {
if (clear_user(buffer, tsz)) {
ret = -EFAULT;
goto out;

13
include/linux/uaccess.h
View File

@ -301,13 +301,14 @@ copy_struct_from_user(void *dst, size_t ksize, const void __user *src,
return 0;
}
bool probe_kernel_read_allowed(const void *unsafe_src, size_t size);
bool copy_from_kernel_nofault_allowed(const void *unsafe_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 size);
extern long probe_kernel_read(void *dst, const void *src, size_t size);
extern long probe_user_read(void *dst, const void __user *src, size_t size);
extern long notrace probe_kernel_write(void *dst, const void *src, size_t size);
extern long notrace probe_user_write(void __user *dst, const void *src, size_t size);
extern long notrace probe_user_write(void __user *dst, const void *src,
size_t size);
long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr,
long count);
@ -324,7 +325,7 @@ long strnlen_user_nofault(const void __user *unsafe_addr, long count);
* Returns 0 on success, or -EFAULT.
*/
#define probe_kernel_address(addr, retval) \
probe_kernel_read(&retval, addr, sizeof(retval))
copy_from_kernel_nofault(&retval, addr, sizeof(retval))
#ifndef user_access_begin
#define user_access_begin(ptr,len) access_ok(ptr, len)

6
kernel/debug/debug_core.c
View File

@ -169,18 +169,18 @@ int __weak kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
err = probe_kernel_write((char *)bpt->bpt_addr,
err = copy_to_kernel_nofault((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
return err;
}
int __weak kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
return probe_kernel_write((char *)bpt->bpt_addr,
return copy_to_kernel_nofault((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}

6
kernel/debug/gdbstub.c
View File

@ -247,7 +247,7 @@ char *kgdb_mem2hex(char *mem, char *buf, int count)
*/
tmp = buf + count;
err = probe_kernel_read(tmp, mem, count);
err = copy_from_kernel_nofault(tmp, mem, count);
if (err)
return NULL;
while (count > 0) {
@ -283,7 +283,7 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
*tmp_raw |= hex_to_bin(*tmp_hex--) << 4;
}
return probe_kernel_write(mem, tmp_raw, count);
return copy_to_kernel_nofault(mem, tmp_raw, count);
}
/*
@ -335,7 +335,7 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count)
size++;
}
return probe_kernel_write(mem, c, size);
return copy_to_kernel_nofault(mem, c, size);
}
#if DBG_MAX_REG_NUM > 0

3
kernel/debug/kdb/kdb_main.c
View File

@ -2326,7 +2326,8 @@ void kdb_ps1(const struct task_struct *p)
int cpu;
unsigned long tmp;
if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
if (!p ||
copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return;
cpu = kdb_process_cpu(p);

7
kernel/debug/kdb/kdb_support.c
View File

@ -325,7 +325,7 @@ char *kdb_strdup(const char *str, gfp_t type)
*/
int kdb_getarea_size(void *res, unsigned long addr, size_t size)
{
int ret = probe_kernel_read((char *)res, (char *)addr, size);
int ret = copy_from_kernel_nofault((char *)res, (char *)addr, size);
if (ret) {
if (!KDB_STATE(SUPPRESS)) {
kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
@ -350,7 +350,7 @@ int kdb_getarea_size(void *res, unsigned long addr, size_t size)
*/
int kdb_putarea_size(unsigned long addr, void *res, size_t size)
{
int ret = probe_kernel_read((char *)addr, (char *)res, size);
int ret = copy_from_kernel_nofault((char *)addr, (char *)res, size);
if (ret) {
if (!KDB_STATE(SUPPRESS)) {
kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
@ -624,7 +624,8 @@ char kdb_task_state_char (const struct task_struct *p)
char state;
unsigned long tmp;
if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
if (!p ||
copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return 'E';
cpu = kdb_process_cpu(p);

2
kernel/kthread.c
View File

@ -201,7 +201,7 @@ void *kthread_probe_data(struct task_struct *task)
struct kthread *kthread = to_kthread(task);
void *data = NULL;
probe_kernel_read(&data, &kthread->data, sizeof(data));
copy_from_kernel_nofault(&data, &kthread->data, sizeof(data));
return data;
}

4
kernel/trace/bpf_trace.c
View File

@ -196,7 +196,7 @@ bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
if (unlikely(ret < 0))
goto fail;
ret = probe_kernel_read(dst, unsafe_ptr, size);
ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
if (unlikely(ret < 0))
goto fail;
return ret;
@ -661,7 +661,7 @@ BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size,
copy_size = (fmt[i + 2] == '4') ? 4 : 16;
err = probe_kernel_read(bufs->buf[memcpy_cnt],
err = copy_from_kernel_nofault(bufs->buf[memcpy_cnt],
(void *) (long) args[fmt_cnt],
copy_size);
if (err < 0)

4
kernel/trace/trace_kprobe.c
View File

@ -1222,7 +1222,7 @@ fetch_store_strlen(unsigned long addr)
#endif
do {
ret = probe_kernel_read(&c, (u8 *)addr + len, 1);
ret = copy_from_kernel_nofault(&c, (u8 *)addr + len, 1);
len++;
} while (c && ret == 0 && len < MAX_STRING_SIZE);
@ -1300,7 +1300,7 @@ probe_mem_read(void *dest, void *src, size_t size)
if ((unsigned long)src < TASK_SIZE)
return probe_mem_read_user(dest, src, size);
#endif
return probe_kernel_read(dest, src, size);
return copy_from_kernel_nofault(dest, src, size);
}
/* Note that we don't verify it, since the code does not come from user space */

10
kernel/workqueue.c
View File

@ -4638,11 +4638,11 @@ void print_worker_info(const char *log_lvl, struct task_struct *task)
* Carefully copy the associated workqueue's workfn, name and desc.
* Keep the original last '\0' in case the original is garbage.
*/
probe_kernel_read(&fn, &worker->current_func, sizeof(fn));
probe_kernel_read(&pwq, &worker->current_pwq, sizeof(pwq));
probe_kernel_read(&wq, &pwq->wq, sizeof(wq));
probe_kernel_read(name, wq->name, sizeof(name) - 1);
probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
copy_from_kernel_nofault(&fn, &worker->current_func, sizeof(fn));
copy_from_kernel_nofault(&pwq, &worker->current_pwq, sizeof(pwq));
copy_from_kernel_nofault(&wq, &pwq->wq, sizeof(wq));
copy_from_kernel_nofault(name, wq->name, sizeof(name) - 1);
copy_from_kernel_nofault(desc, worker->desc, sizeof(desc) - 1);
if (fn || name[0] || desc[0]) {
printk("%sWorkqueue: %s %ps", log_lvl, name, fn);

8
mm/debug.c
View File

@ -120,9 +120,9 @@ void __dump_page(struct page *page, const char *reason)
* mapping can be invalid pointer and we don't want to crash
* accessing it, so probe everything depending on it carefully
*/
if (probe_kernel_read(&host, &mapping->host,
if (copy_from_kernel_nofault(&host, &mapping->host,
sizeof(struct inode *)) ||
probe_kernel_read(&a_ops, &mapping->a_ops,
copy_from_kernel_nofault(&a_ops, &mapping->a_ops,
sizeof(struct address_space_operations *))) {
pr_warn("failed to read mapping->host or a_ops, mapping not a valid kernel address?\n");
goto out_mapping;
@ -133,7 +133,7 @@ void __dump_page(struct page *page, const char *reason)
goto out_mapping;
}
if (probe_kernel_read(&dentry_first,
if (copy_from_kernel_nofault(&dentry_first,
&host->i_dentry.first, sizeof(struct hlist_node *))) {
pr_warn("mapping->a_ops:%ps with invalid mapping->host inode address %px\n",
a_ops, host);
@ -146,7 +146,7 @@ void __dump_page(struct page *page, const char *reason)
}
dentry_ptr = container_of(dentry_first, struct dentry, d_u.d_alias);
if (probe_kernel_read(&dentry, dentry_ptr,
if (copy_from_kernel_nofault(&dentry, dentry_ptr,
sizeof(struct dentry))) {
pr_warn("mapping->aops:%ps with invalid mapping->host->i_dentry.first %px\n",
a_ops, dentry_ptr);

49
mm/maccess.c
View File

@ -6,14 +6,15 @@
#include <linux/mm.h>
#include <linux/uaccess.h>
bool __weak probe_kernel_read_allowed(const void *unsafe_src, size_t size)
bool __weak copy_from_kernel_nofault_allowed(const void *unsafe_src,
size_t size)
{
return true;
}
#ifdef HAVE_GET_KERNEL_NOFAULT
#define probe_kernel_read_loop(dst, src, len, type, err_label) \
#define copy_from_kernel_nofault_loop(dst, src, len, type, err_label) \
while (len >= sizeof(type)) { \
__get_kernel_nofault(dst, src, type, err_label); \
dst += sizeof(type); \
@ -21,25 +22,25 @@ bool __weak probe_kernel_read_allowed(const void *unsafe_src, size_t size)
len -= sizeof(type); \
}
long probe_kernel_read(void *dst, const void *src, size_t size)
long copy_from_kernel_nofault(void *dst, const void *src, size_t size)
{
if (!probe_kernel_read_allowed(src, size))
if (!copy_from_kernel_nofault_allowed(src, size))
return -ERANGE;
pagefault_disable();
probe_kernel_read_loop(dst, src, size, u64, Efault);
probe_kernel_read_loop(dst, src, size, u32, Efault);
probe_kernel_read_loop(dst, src, size, u16, Efault);
probe_kernel_read_loop(dst, src, size, u8, Efault);
copy_from_kernel_nofault_loop(dst, src, size, u64, Efault);
copy_from_kernel_nofault_loop(dst, src, size, u32, Efault);
copy_from_kernel_nofault_loop(dst, src, size, u16, Efault);
copy_from_kernel_nofault_loop(dst, src, size, u8, Efault);
pagefault_enable();
return 0;
Efault:
pagefault_enable();
return -EFAULT;
}
EXPORT_SYMBOL_GPL(probe_kernel_read);
EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);
#define probe_kernel_write_loop(dst, src, len, type, err_label) \
#define copy_to_kernel_nofault_loop(dst, src, len, type, err_label) \
while (len >= sizeof(type)) { \
__put_kernel_nofault(dst, src, type, err_label); \
dst += sizeof(type); \
@ -47,13 +48,13 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
len -= sizeof(type); \
}
long probe_kernel_write(void *dst, const void *src, size_t size)
long copy_to_kernel_nofault(void *dst, const void *src, size_t size)
{
pagefault_disable();
probe_kernel_write_loop(dst, src, size, u64, Efault);
probe_kernel_write_loop(dst, src, size, u32, Efault);
probe_kernel_write_loop(dst, src, size, u16, Efault);
probe_kernel_write_loop(dst, src, size, u8, Efault);
copy_to_kernel_nofault_loop(dst, src, size, u64, Efault);
copy_to_kernel_nofault_loop(dst, src, size, u32, Efault);
copy_to_kernel_nofault_loop(dst, src, size, u16, Efault);
copy_to_kernel_nofault_loop(dst, src, size, u8, Efault);
pagefault_enable();
return 0;
Efault:
@ -67,7 +68,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
if (unlikely(count <= 0))
return 0;
if (!probe_kernel_read_allowed(unsafe_addr, count))
if (!copy_from_kernel_nofault_allowed(unsafe_addr, count))
return -ERANGE;
pagefault_disable();
@ -87,7 +88,7 @@ Efault:
}
#else /* HAVE_GET_KERNEL_NOFAULT */
/**
* probe_kernel_read(): safely attempt to read from kernel-space
* copy_from_kernel_nofault(): safely attempt to read from kernel-space
* @dst: pointer to the buffer that shall take the data
* @src: address to read from
* @size: size of the data chunk
@ -98,15 +99,15 @@ Efault:
*
* We ensure that the copy_from_user is executed in atomic context so that
* do_page_fault() doesn't attempt to take mmap_lock. This makes
* probe_kernel_read() suitable for use within regions where the caller
* copy_from_kernel_nofault() suitable for use within regions where the caller
* already holds mmap_lock, or other locks which nest inside mmap_lock.
*/
long probe_kernel_read(void *dst, const void *src, size_t size)
long copy_from_kernel_nofault(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
if (!probe_kernel_read_allowed(src, size))
if (!copy_from_kernel_nofault_allowed(src, size))
return -ERANGE;
set_fs(KERNEL_DS);
@ -120,10 +121,10 @@ long probe_kernel_read(void *dst, const void *src, size_t size)
return -EFAULT;
return 0;
}
EXPORT_SYMBOL_GPL(probe_kernel_read);
EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);
/**
* probe_kernel_write(): safely attempt to write to a location
* copy_to_kernel_nofault(): safely attempt to write to a location
* @dst: address to write to
* @src: pointer to the data that shall be written
* @size: size of the data chunk
@ -131,7 +132,7 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
* Safely write to address @dst from the buffer at @src. If a kernel fault
* happens, handle that and return -EFAULT.
*/
long probe_kernel_write(void *dst, const void *src, size_t size)
long copy_to_kernel_nofault(void *dst, const void *src, size_t size)
{
long ret;
mm_segment_t old_fs = get_fs();
@ -174,7 +175,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
if (unlikely(count <= 0))
return 0;
if (!probe_kernel_read_allowed(unsafe_addr, count))
if (!copy_from_kernel_nofault_allowed(unsafe_addr, count))
return -ERANGE;
set_fs(KERNEL_DS);

2
mm/rodata_test.c
View File

@ -25,7 +25,7 @@ void rodata_test(void)
}
/* test 2: write to the variable; this should fault */
if (!probe_kernel_write((void *)&rodata_test_data,
if (!copy_to_kernel_nofault((void *)&rodata_test_data,
(void *)&zero, sizeof(zero))) {
pr_err("test data was not read only\n");
return;

2
mm/slub.c
View File

@ -292,7 +292,7 @@ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object)
return get_freepointer(s, object);
freepointer_addr = (unsigned long)object + s->offset;
probe_kernel_read(&p, (void **)freepointer_addr, sizeof(p));
copy_from_kernel_nofault(&p, (void **)freepointer_addr, sizeof(p));
return freelist_ptr(s, p, freepointer_addr);
}