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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/lib/usercopy.c
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@@ -3,6 +3,7 @@
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 #include <linux/fault-inject-usercopy.h>
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 #include <linux/instrumented.h>
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 #include <linux/uaccess.h>
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+#include <linux/nospec.h>
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 /* out-of-line parts */
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@@ -12,6 +13,12 @@
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 	unsigned long res = n;
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 	might_fault();
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 	if (!should_fail_usercopy() && likely(access_ok(from, n))) {
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+		/*
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+		 * Ensure that bad access_ok() speculation will not
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+		 * lead to nasty side effects *after* the copy is
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+		 * finished:
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+		 */
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+		barrier_nospec();
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 		instrument_copy_from_user(to, from, n);
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 		res = raw_copy_from_user(to, from, n);
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 	}