Messages in this thread Patch in this message | | | From | Kees Cook <> | Subject | [PATCH] usercopy: Disable CONFIG_HARDENED_USERCOPY_PAGESPAN | Date | Thu, 24 Mar 2022 16:02:55 -0700 |
| |
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@lst.de> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Signed-off-by: Kees Cook <keescook@chromium.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
| |