From ef3e787c21d1efcd297f0cf2e9535e76188fb831 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 24 Mar 2022 15:57:25 -0700 Subject: 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 Cc: "Matthew Wilcox (Oracle)" Signed-off-by: Kees Cook --- security/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'security') 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, -- cgit v1.2.3