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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-03 18:57:57 -0800
commit96d4f267e40f9509e8a66e2b39e8b95655617693 (patch)
treedf03d142d405652392707b1b80c284d68d6ea6ab /arch/sh/kernel
parent135143b2cac43d2a1ec73b53033b9473fbbcce6d (diff)
Remove 'type' argument from access_ok() function
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/kernel')
-rw-r--r--arch/sh/kernel/signal_32.c8
-rw-r--r--arch/sh/kernel/signal_64.c8
-rw-r--r--arch/sh/kernel/traps_64.c12
3 files changed, 14 insertions, 14 deletions
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index c46c0020ff55..2a2121ba8ebe 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -160,7 +160,7 @@ asmlinkage int sys_sigreturn(void)
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
@@ -190,7 +190,7 @@ asmlinkage int sys_rt_sigreturn(void)
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
@@ -272,7 +272,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
return -EFAULT;
err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
@@ -338,7 +338,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
frame = get_sigframe(&ksig->ka, regs->regs[15], sizeof(*frame));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
return -EFAULT;
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 76661dee3c65..f1f1598879c2 100644
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -259,7 +259,7 @@ asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
@@ -293,7 +293,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
@@ -379,7 +379,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs
frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
return -EFAULT;
err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
@@ -465,7 +465,7 @@ static int setup_rt_frame(struct ksignal *kig, sigset_t *set,
frame = get_sigframe(&ksig->ka, regs->regs[REG_SP], sizeof(*frame));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
return -EFAULT;
err |= __put_user(&frame->info, &frame->pinfo);
diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
index c52bda4d2574..8ce90a7da67d 100644
--- a/arch/sh/kernel/traps_64.c
+++ b/arch/sh/kernel/traps_64.c
@@ -40,7 +40,7 @@ static int read_opcode(reg_size_t pc, insn_size_t *result_opcode, int from_user_
/* SHmedia */
aligned_pc = pc & ~3;
if (from_user_mode) {
- if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t))) {
+ if (!access_ok(aligned_pc, sizeof(insn_size_t))) {
get_user_error = -EFAULT;
} else {
get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);
@@ -180,7 +180,7 @@ static int misaligned_load(struct pt_regs *regs,
if (user_mode(regs)) {
__u64 buffer;
- if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+ if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
return -1;
}
@@ -254,7 +254,7 @@ static int misaligned_store(struct pt_regs *regs,
if (user_mode(regs)) {
__u64 buffer;
- if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+ if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
return -1;
}
@@ -327,7 +327,7 @@ static int misaligned_fpu_load(struct pt_regs *regs,
__u64 buffer;
__u32 buflo, bufhi;
- if (!access_ok(VERIFY_READ, (unsigned long) address, 1UL<<width_shift)) {
+ if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
return -1;
}
@@ -400,7 +400,7 @@ static int misaligned_fpu_store(struct pt_regs *regs,
/* Initialise these to NaNs. */
__u32 buflo=0xffffffffUL, bufhi=0xffffffffUL;
- if (!access_ok(VERIFY_WRITE, (unsigned long) address, 1UL<<width_shift)) {
+ if (!access_ok((unsigned long) address, 1UL<<width_shift)) {
return -1;
}
@@ -663,7 +663,7 @@ void do_reserved_inst(unsigned long error_code, struct pt_regs *regs)
/* SHmedia : check for defect. This requires executable vmas
to be readable too. */
aligned_pc = pc & ~3;
- if (!access_ok(VERIFY_READ, aligned_pc, sizeof(insn_size_t)))
+ if (!access_ok(aligned_pc, sizeof(insn_size_t)))
get_user_error = -EFAULT;
else
get_user_error = __get_user(opcode, (insn_size_t *)aligned_pc);