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@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201207124141.21859-1-lukas.bulwahn@gmail.com

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 81cf223..5e3d9b7 100644 (file)
--- 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))