Le 21/02/2021 à 02:23, Christopher M. Riedl a écrit :
Just wrap __copy_tofrom_user() for the usual 'unsafe' pattern which
accepts a label to goto on error.
Signed-off-by: Christopher M. Riedl <[email protected]>
Reviewed-by: Daniel Axtens <[email protected]>
---
arch/powerpc/include/asm/uaccess.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/include/asm/uaccess.h
b/arch/powerpc/include/asm/uaccess.h
index 78e2a3990eab..33b2de642120 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -487,6 +487,9 @@ user_write_access_begin(const void __user *ptr, size_t len)
#define unsafe_put_user(x, p, e) \
__unsafe_put_user_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e)
+#define unsafe_copy_from_user(d, s, l, e) \
+ unsafe_op_wrap(__copy_tofrom_user((__force void __user *)d, s, l), e)
+
Could we perform same as unsafe_copy_to_user() instead of calling an external function which is
banned in principle inside uaccess blocks ?
#define unsafe_copy_to_user(d, s, l, e) \
do { \
u8 __user *_dst = (u8 __user *)(d); \
