linux-hardening - [PATCH] usercopy: Disable CONFIG_HARDENED_USERCOPY

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Date:   Thu, 24 Mar 2022 16:02:55 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>, Christoph Hellwig <hch@....de>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] usercopy: Disable CONFIG_HARDENED_USERCOPY_PAGESPAN

CONFIG_HARDENED_USERCOPY_PAGESPAN has been mostly broken for a while,
and it has become hard to ignore with some recent scsi changes[1].
While there is a more complete series to replace it with better checks[2],
it should have more soak time in -next. Instead, disable the config now,
with the expectation that it will be fully replaced in the next kernel
release.

[1] https://lore.kernel.org/lkml/20220324064846.GA12961@lst.de/
[2] https://lore.kernel.org/linux-hardening/20220110231530.665970-1-willy@infradead.org/

Suggested-by: Christoph Hellwig <hch@....de>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 security/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/Kconfig b/security/Kconfig
index 0b847f435beb..88a0bc8c592b 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -166,7 +166,7 @@ config HARDENED_USERCOPY
 config HARDENED_USERCOPY_PAGESPAN
 	bool "Refuse to copy allocations that span multiple pages"
 	depends on HARDENED_USERCOPY
-	depends on EXPERT
+	depends on BROKEN
 	help
 	  When a multi-page allocation is done without __GFP_COMP,
 	  hardened usercopy will reject attempts to copy it. There are,
-- 
2.32.0