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syscall_user_dispatch: Use CONFIG_SYSCTL for sysctl guard

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Commit 8d75c338f0 ("sysctl: remove CONFIG_PROC_SYSCTL, it just mirrors
CONFIG_SYSCTL") removed CONFIG_PROC_SYSCTL, but the sysctl added by
commit 5b6e32ba7b ("syscall_user_dispatch: Add
kernel.syscall_user_dispatch sysctl") is still guarded by it. Now that
both commits are merged, kernel.syscall_user_dispatch is no longer
registered.

syscall_user_dispatch_allowed defaults to true. SUD therefore remains
available, but administrators cannot disable new activations.

Use CONFIG_SYSCTL for the guard and documentation.

Fixes: 5b6e32ba7b ("syscall_user_dispatch: Add kernel.syscall_user_dispatch sysctl")
Assisted-by: Codex:gpt-5.6-sol
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Joel Granados <joel.granados@kernel.org>
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Bradley Morgan <include@grrlz.net>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
This commit is contained in:
Karl Mehltretter 2026-08-22 09:23:25 +02:00 committed by Joel Granados
parent df2908090c
commit 353a95f1cd
2 changed files with 3 additions and 3 deletions
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2
Documentation/admin-guide/sysctl/kernel.rst
View File

@ -1416,7 +1416,7 @@ Controls whether userspace may arm Syscall User Dispatch via
== ===================================================================
Only present when the kernel is built with ``CONFIG_SYSCALL_USER_DISPATCH``
and ``CONFIG_PROC_SYSCTL``.
and ``CONFIG_SYSCTL``.
sysctl_writes_strict

4
kernel/entry/syscall_user_dispatch.c
View File

@ -178,7 +178,7 @@ int syscall_user_dispatch_set_config(struct task_struct *task, unsigned long siz
(char __user *)(uintptr_t)cfg.selector);
}
#ifdef CONFIG_PROC_SYSCTL
#ifdef CONFIG_SYSCTL
static const struct ctl_table syscall_user_dispatch_sysctls[] = {
{
.procname = "syscall_user_dispatch",
@ -195,4 +195,4 @@ static int __init syscall_user_dispatch_sysctl_init(void)
return 0;
}
late_initcall(syscall_user_dispatch_sysctl_init);
#endif /* CONFIG_PROC_SYSCTL */
#endif /* CONFIG_SYSCTL */