[tip: x86/cleanups] x86/ia32_signal: Propagate __user annotation properly

[tip-bot2 for Lukas Bulwahn]

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     9a02fd8b19247e80e2354a227b6e2392e8fae78a
Gitweb:        https://git.kernel.org/tip/9a02fd8b19247e80e2354a227b6e2392e8fae78a
Author:        Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
AuthorDate:    Mon, 07 Dec 2020 13:41:41 +01:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 11 Dec 2020 19:44:31 +01:00

x86/ia32_signal: Propagate __user annotation properly

Commit

  57d563c82925 ("x86: ia32_setup_rt_frame(): consolidate uaccess areas")

dropped a __user annotation in a cast when refactoring __put_user() to
unsafe_put_user().

Hence, since then, sparse warns in arch/x86/ia32/ia32_signal.c:350:9:

  warning: cast removes address space '__user' of expression
  warning: incorrect type in argument 1 (different address spaces)
    expected void const volatile [noderef] __user *ptr
    got unsigned long long [usertype] *

Add the __user annotation to restore the propagation of address spaces.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20201207124141.21859-1-lukas.bulwahn@xxxxxxxxx
---
 arch/x86/ia32/ia32_signal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 81cf223..5e3d9b7 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -347,7 +347,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
 	 */
 	unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
 	unsafe_put_sigcontext32(&frame->uc.uc_mcontext, fp, regs, set, Efault);
-	unsafe_put_user(*(__u64 *)set, (__u64 *)&frame->uc.uc_sigmask, Efault);
+	unsafe_put_user(*(__u64 *)set, (__u64 __user *)&frame->uc.uc_sigmask, Efault);
 	user_access_end();
 
 	if (__copy_siginfo_to_user32(&frame->info, &ksig->info))