lkml.org 
[lkml]   [2018]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.14 024/195] [Variant 3/Meltdown] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Will Deacon <will.deacon@arm.com>


    Commit 376133b7edc2 upstream.

    We're about to rework the way ASIDs are allocated, switch_mm is
    implemented and low-level kernel entry/exit is handled, so keep the
    ARM64_SW_TTBR0_PAN code out of the way whilst we do the heavy lifting.

    It will be re-enabled in a subsequent patch.

    Reviewed-by: Mark Rutland <mark.rutland@arm.com>
    Tested-by: Laura Abbott <labbott@redhat.com>
    Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/arm64/Kconfig | 1 +
    1 file changed, 1 insertion(+)

    --- a/arch/arm64/Kconfig
    +++ b/arch/arm64/Kconfig
    @@ -882,6 +882,7 @@ endif

    config ARM64_SW_TTBR0_PAN
    bool "Emulate Privileged Access Never using TTBR0_EL1 switching"
    + depends on BROKEN # Temporary while switch_mm is reworked
    help
    Enabling this option prevents the kernel from accessing
    user-space memory directly by pointing TTBR0_EL1 to a reserved

    \
     
     \ /
      Last update: 2018-02-15 18:52    [W:4.299 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site