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new helper: uaccess_kernel()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-03-20 21:08:07 -04:00
parent aaa2e7ac80
commit db68ce10c4
32 changed files with 44 additions and 42 deletions
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10
arch/um/kernel/skas/uaccess.c
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@@ -141,7 +141,7 @@ static int copy_chunk_from_user(unsigned long from, int len, void *arg)
long __copy_from_user(void *to, const void __user *from, unsigned long n)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
if (uaccess_kernel()) {
memcpy(to, (__force void*)from, n);
return 0;
}
@@ -161,7 +161,7 @@ static int copy_chunk_to_user(unsigned long to, int len, void *arg)
long __copy_to_user(void __user *to, const void *from, unsigned long n)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
if (uaccess_kernel()) {
memcpy((__force void *) to, from, n);
return 0;
}
@@ -189,7 +189,7 @@ long __strncpy_from_user(char *dst, const char __user *src, long count)
long n;
char *ptr = dst;
if (segment_eq(get_fs(), KERNEL_DS)) {
if (uaccess_kernel()) {
strncpy(dst, (__force void *) src, count);
return strnlen(dst, count);
}
@@ -210,7 +210,7 @@ static int clear_chunk(unsigned long addr, int len, void *unused)
unsigned long __clear_user(void __user *mem, unsigned long len)
{
if (segment_eq(get_fs(), KERNEL_DS)) {
if (uaccess_kernel()) {
memset((__force void*)mem, 0, len);
return 0;
}
@@ -235,7 +235,7 @@ long __strnlen_user(const void __user *str, long len)
{
int count = 0, n;
if (segment_eq(get_fs(), KERNEL_DS))
if (uaccess_kernel())
return strnlen((__force char*)str, len) + 1;
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);