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authorChristoph Hellwig <hch@lst.de>2020-06-17 09:37:53 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-17 10:57:41 -0700
commitfe557319aa06c23cffc9346000f119547e0f289a (patch)
tree575c46f0a54b789a7f942e3366ade6f0f90f6212 /mm/maccess.c
parentb3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff)
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
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>
Diffstat (limited to 'mm/maccess.c')
-rw-r--r--mm/maccess.c49
1 files changed, 25 insertions, 24 deletions
diff --git a/mm/maccess.c b/mm/maccess.c
index 88845eda5047..cc5d8c6233c0 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -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);