add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/unix/scm.c
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@@ -8,6 +8,7 @@
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 #include <net/af_unix.h>
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 #include <net/scm.h>
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 #include <linux/init.h>
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+#include <linux/io_uring.h>
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 #include "scm.h"
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@@ -33,6 +34,9 @@
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 		/* PF_UNIX ? */
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 		if (s && sock->ops && sock->ops->family == PF_UNIX)
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 			u_sock = s;
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+	} else {
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+		/* Could be an io_uring instance */
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+		u_sock = io_uring_get_socket(filp);
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 	}
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 	return u_sock;
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 }
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@@ -59,7 +63,7 @@
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 		/* Paired with READ_ONCE() in wait_for_unix_gc() */
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 		WRITE_ONCE(unix_tot_inflight, unix_tot_inflight + 1);
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 	}
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-	user->unix_inflight++;
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+	WRITE_ONCE(user->unix_inflight, user->unix_inflight + 1);
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 	spin_unlock(&unix_gc_lock);
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 }
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@@ -80,7 +84,7 @@
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 		/* Paired with READ_ONCE() in wait_for_unix_gc() */
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 		WRITE_ONCE(unix_tot_inflight, unix_tot_inflight - 1);
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 	}
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-	user->unix_inflight--;
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+	WRITE_ONCE(user->unix_inflight, user->unix_inflight - 1);
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 	spin_unlock(&unix_gc_lock);
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 }
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@@ -94,7 +98,7 @@
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 {
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 	struct user_struct *user = current_user();
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-	if (unlikely(user->unix_inflight > task_rlimit(p, RLIMIT_NOFILE)))
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+	if (unlikely(READ_ONCE(user->unix_inflight) > task_rlimit(p, RLIMIT_NOFILE)))
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 		return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN);
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 	return false;
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 }