From fb05121fd6a20f0830ff2a4420c51af6ca4ac6e7 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Fri, 19 Mar 2021 11:06:50 +0000 Subject: signal: Add unsafe_get_compat_sigset() In the same way as commit 14026b94ccfe ("signal: Add unsafe_put_compat_sigset()"), this time add unsafe_get_compat_sigset() macro which is the 'unsafe' version of get_compat_sigset() For the bigendian, use unsafe_get_user() directly to avoid intermediate copy through the stack. For the littleendian, use a straight unsafe_copy_from_user(). This commit adds the generic fallback for unsafe_copy_from_user(). Architectures wanting to use unsafe_get_compat_sigset() have to make sure they have their own unsafe_copy_from_user(). Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b05bf434ee13c76bc9df5f02653a10db5e7b54e5.1616151715.git.christophe.leroy@csgroup.eu --- include/linux/uaccess.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/uaccess.h') diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index c7c6e8b8344d..c05e903cef02 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -397,6 +397,7 @@ long strnlen_user_nofault(const void __user *unsafe_addr, long count); #define unsafe_get_user(x,p,e) unsafe_op_wrap(__get_user(x,p),e) #define unsafe_put_user(x,p,e) unsafe_op_wrap(__put_user(x,p),e) #define unsafe_copy_to_user(d,s,l,e) unsafe_op_wrap(__copy_to_user(d,s,l),e) +#define unsafe_copy_from_user(d,s,l,e) unsafe_op_wrap(__copy_from_user(d,s,l),e) static inline unsigned long user_access_save(void) { return 0UL; } static inline void user_access_restore(unsigned long flags) { } #endif -- cgit v1.2.3