nospec: Allow getting/setting on non-current task
commit 7bbf1373e228840bb0295a2ca26d548ef37f448e upstream
Adjust arch_prctl_get/set_spec_ctrl() to operate on tasks other than
current.
This is needed both for /proc/$pid/status queries and for seccomp (since
thread-syncing can trigger seccomp in non-current threads).
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/kernel/sys.c b/kernel/sys.c
index 312c985..143cd63 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2074,12 +2074,13 @@
}
#endif
-int __weak arch_prctl_spec_ctrl_get(unsigned long which)
+int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which)
{
return -EINVAL;
}
-int __weak arch_prctl_spec_ctrl_set(unsigned long which, unsigned long ctrl)
+int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which,
+ unsigned long ctrl)
{
return -EINVAL;
}
@@ -2285,12 +2286,12 @@
case PR_GET_SPECULATION_CTRL:
if (arg3 || arg4 || arg5)
return -EINVAL;
- error = arch_prctl_spec_ctrl_get(arg2);
+ error = arch_prctl_spec_ctrl_get(me, arg2);
break;
case PR_SET_SPECULATION_CTRL:
if (arg4 || arg5)
return -EINVAL;
- error = arch_prctl_spec_ctrl_set(arg2, arg3);
+ error = arch_prctl_spec_ctrl_set(me, arg2, arg3);
break;
default:
error = -EINVAL;