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nospec: Allow getting/setting on non-current task

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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>
This commit is contained in:
Kees Cook 2018-05-01 15:19:04 -07:00 • committed by Thomas Gleixner
commit 7bbf1373e2
3 changed files with 26 additions and 17 deletions
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9
kernel/sys.c
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@ -2244,12 +2244,13 @@ static int propagate_has_child_subreaper(struct task_struct *p, void *data)
return 1;
}
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;
}
@ -2465,12 +2466,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
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;