From: Christophe Leroy <christophe.leroy@c-s.fr> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au> Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc/uaccess: Don't set KUEP by default on book3s/32 Date: Wed, 15 Apr 2020 14:57:11 +0000 (UTC) [thread overview] Message-ID: <1492bb150c1aaa53d99a604b49992e60ea20cd5f.1586962582.git.christophe.leroy@c-s.fr> (raw) On book3s/32, KUEP is an heavy process as it requires to set/unset the NX bit in each of the 12 user segments everytime the kernel is entered/exited from/to user space. Don't select KUEP by default on book3s/32. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/platforms/Kconfig.cputype | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 0c7151c98b56..11412078e732 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -377,7 +377,7 @@ config PPC_HAVE_KUEP config PPC_KUEP bool "Kernel Userspace Execution Prevention" depends on PPC_HAVE_KUEP - default y + default y if !PPC_BOOK3S_32 help Enable support for Kernel Userspace Execution Prevention (KUEP) -- 2.25.0
WARNING: multiple messages have this Message-ID (diff)
From: Christophe Leroy <christophe.leroy@c-s.fr> To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au> Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] powerpc/uaccess: Don't set KUEP by default on book3s/32 Date: Wed, 15 Apr 2020 14:57:11 +0000 (UTC) [thread overview] Message-ID: <1492bb150c1aaa53d99a604b49992e60ea20cd5f.1586962582.git.christophe.leroy@c-s.fr> (raw) On book3s/32, KUEP is an heavy process as it requires to set/unset the NX bit in each of the 12 user segments everytime the kernel is entered/exited from/to user space. Don't select KUEP by default on book3s/32. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/platforms/Kconfig.cputype | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 0c7151c98b56..11412078e732 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -377,7 +377,7 @@ config PPC_HAVE_KUEP config PPC_KUEP bool "Kernel Userspace Execution Prevention" depends on PPC_HAVE_KUEP - default y + default y if !PPC_BOOK3S_32 help Enable support for Kernel Userspace Execution Prevention (KUEP) -- 2.25.0
next reply other threads:[~2020-04-15 14:57 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-15 14:57 Christophe Leroy [this message] 2020-04-15 14:57 ` [PATCH] powerpc/uaccess: Don't set KUEP by default on book3s/32 Christophe Leroy 2020-06-09 5:28 ` Michael Ellerman
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