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Date: Thu, 9 Mar 2017 13:19:49 -0800 From: Tycho Andersen <tycho@...ker.com> To: Kees Cook <keescook@...omium.org>, James Morris <james.l.morris@...cle.com> Cc: linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, Tycho Andersen <tycho@...ker.com>, "Serge E. Hallyn" <serge@...lyn.com> Subject: [PATCH v3] security/Kconfig: further restrict HARDENED_USERCOPY It doesn't make sense to have HARDENED_USERCOPY when either /dev/kmem is enabled or /dev/mem can be used to read kernel memory (i.e. !STRICT_DEVMEM). v2: add !MMU depend as well v3: drop !MMU, s/ARCH_HAS_DEVMEM_IS_ALLOWED/DEVMEM, which makes the above commit message actually match the logic again Signed-off-by: Tycho Andersen <tycho@...ker.com> CC: Kees Cook <keescook@...omium.org> CC: "Serge E. Hallyn" <serge@...lyn.com> CC: James Morris <james.l.morris@...cle.com> --- security/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/security/Kconfig b/security/Kconfig index 3ff1bf9..4619cee 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -142,6 +142,8 @@ config HARDENED_USERCOPY bool "Harden memory copies between kernel and userspace" depends on HAVE_ARCH_HARDENED_USERCOPY depends on HAVE_HARDENED_USERCOPY_ALLOCATOR + depends on !DEVKMEM + depends on !DEVMEM || STRICT_DEVMEM select BUG help This option checks for obviously wrong memory regions when -- 2.7.4
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