From: Russell Currey <ruscur@russell.cc>
To: linuxppc-dev@lists.ozlabs.org
Cc: ajd@linux.ibm.com, kernel-hardening@lists.openwall.com,
npiggin@gmail.com, Russell Currey <ruscur@russell.cc>,
dja@axtens.net
Subject: [PATCH v8 4/7] powerpc: Set ARCH_HAS_STRICT_MODULE_RWX
Date: Thu, 2 Apr 2020 19:40:49 +1100 [thread overview]
Message-ID: <20200402084053.188537-4-ruscur@russell.cc> (raw)
In-Reply-To: <20200402084053.188537-1-ruscur@russell.cc>
To enable strict module RWX on powerpc, set:
CONFIG_STRICT_MODULE_RWX=y
You should also have CONFIG_STRICT_KERNEL_RWX=y set to have any real
security benefit.
ARCH_HAS_STRICT_MODULE_RWX is set to require ARCH_HAS_STRICT_KERNEL_RWX.
This is due to a quirk in arch/Kconfig and arch/powerpc/Kconfig that
makes STRICT_MODULE_RWX *on by default* in configurations where
STRICT_KERNEL_RWX is *unavailable*.
Since this doesn't make much sense, and module RWX without kernel RWX
doesn't make much sense, having the same dependencies as kernel RWX
works around this problem.
Signed-off-by: Russell Currey <ruscur@russell.cc>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 399a4de28ff0..1488bb5f4179 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -131,6 +131,7 @@ config PPC
select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE && PPC_BOOK3S_64
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !HIBERNATION)
+ select ARCH_HAS_STRICT_MODULE_RWX if ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UACCESS_FLUSHCACHE
select ARCH_HAS_UACCESS_MCSAFE if PPC64
--
2.26.0
next prev parent reply other threads:[~2020-04-02 8:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 8:40 [PATCH v8 1/7] powerpc/mm: Implement set_memory() routines Russell Currey
2020-04-02 8:40 ` [PATCH v8 2/7] powerpc/kprobes: Mark newly allocated probes as RO Russell Currey
2020-04-02 16:16 ` Naveen N. Rao
2020-04-02 18:48 ` Naveen N. Rao
2020-04-02 23:02 ` Russell Currey
2020-04-03 7:59 ` Russell Currey
2020-04-03 9:36 ` Naveen N. Rao
2020-04-03 9:42 ` Russell Currey
2020-04-03 10:03 ` Naveen N. Rao
2020-04-02 8:40 ` [PATCH v8 3/7] powerpc/mm/ptdump: debugfs handler for W+X checks at runtime Russell Currey
2020-04-02 8:40 ` Russell Currey [this message]
2020-04-02 8:40 ` [PATCH v8 5/7] powerpc/configs: Enable STRICT_MODULE_RWX in skiroot_defconfig Russell Currey
2020-04-02 8:40 ` [PATCH v8 6/7] powerpc/mm: implement set_memory_attr() Russell Currey
2020-04-02 8:40 ` [PATCH v8 7/7] powerpc/32: use set_memory_attr() Russell Currey
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200402084053.188537-4-ruscur@russell.cc \
--to=ruscur@russell.cc \
--cc=ajd@linux.ibm.com \
--cc=dja@axtens.net \
--cc=kernel-hardening@lists.openwall.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=npiggin@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).