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db695c0509
linux/arch/arm
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Russell King db695c0509 ARM: remove user cmpxchg syscall 
Mark Brand reports that a NEEDS_SYSCALL_FOR_CMPXCHG enabled kernel would
open a security hole in the ghost syscall used to implement cmpxchg, as
it fails to validate the user pointer.

However, in order for this option to be enabled, you'd need to be
building a pre-ARMv6 kernel with SMP support.  There is only one system
known which fits that, which is an early ARM SMP FPGA implementation
based on the ARM926T.

In any case, the Kconfig does not allow SMP to be enabled for pre-ARMv6
systems.

Moreover, even if NEEDS_SYSCALL_FOR_CMPXCHG were to be enabled, the
kernel would not build as __ARM_NR_cmpxchg64 is not defined.

The simple answer is to remove the buggy code.

Reported-by: Mark Brand <markbrand@google.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-10-03 16:36:45 +01:00
..
boot Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
common genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
configs ARM: SoC: late fixes and dependencies 2015-09-10 17:59:04 -07:00
crypto
firmware
include ARM: remove user cmpxchg syscall 2015-10-03 16:36:45 +01:00
kernel ARM: remove user cmpxchg syscall 2015-10-03 16:36:45 +01:00
kvm arm/arm64: KVM: Remove 'config KVM_ARM_MAX_VCPUS' 2015-09-17 13:13:27 +01:00
lib ARM: 8438/1: Add unwinding to __clear_user_std() 2015-10-03 16:36:45 +01:00
mach-alpine
mach-asm9260
mach-at91 genalloc: add name arg to gen_pool_get() and devm_gen_pool_create() 2015-09-04 16:54:41 -07:00
mach-axxia
mach-bcm ARM: SoC platform updates for v4.3 2015-09-01 12:18:40 -07:00
mach-berlin
mach-clps711x libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
mach-cns3xxx ARM: appropriate __init annotation for const data 2015-07-28 13:55:27 +02:00
mach-davinci ARM: SoC platform updates for v4.3 2015-09-01 12:18:40 -07:00
mach-digicolor ARM: appropriate __init annotation for const data 2015-07-28 13:55:27 +02:00
mach-dove genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-ebsa110 ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-efm32
mach-ep93xx ARM/fb: ep93xx: switch framebuffer to use modedb only 2015-08-13 12:25:44 +02:00
mach-exynos ARM: SoC: late fixes and dependencies 2015-09-10 17:59:04 -07:00
mach-footbridge genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-gemini genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-highbank ARM: migrate to common PSCI client code 2015-08-03 15:38:39 +01:00
mach-hisi
mach-imx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-integrator
mach-iop13xx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-iop32x ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-iop33x ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-ixp4xx ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-keystone
mach-ks8695 ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-lpc18xx
mach-lpc32xx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-mediatek
mach-meson
mach-mmp ARM: mmp: remove unused RTC register definitions 2015-09-05 19:37:17 +02:00
mach-moxart
mach-mv78xx0
mach-mvebu ARM: SoC driver updates for v4.3 2015-09-01 13:00:04 -07:00
mach-mxs ARM: appropriate __init annotation for const data 2015-07-28 13:55:27 +02:00
mach-netx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-nomadik ARM: nomadik: move l2x0 setup to device tree 2015-08-11 15:29:59 +02:00
mach-nspire
mach-omap1 genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-omap2 genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-orion5x ARM: DT updates for v4.3 2015-09-01 13:09:20 -07:00
mach-picoxcell
mach-prima2 Merge branches 'cleanup', 'fixes', 'misc', 'omap-barrier' and 'uaccess' into for-linus 2015-09-03 15:28:37 +01:00
mach-pxa genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-qcom
mach-realview ARM: appropriate __init annotation for const data 2015-07-28 13:55:27 +02:00
mach-rockchip ARM: rockchip: pm: Fix PTR_ERR() argument 2015-08-24 12:39:14 +02:00
mach-rpc genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-s3c24xx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-s3c64xx genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-s5pv210
mach-sa1100 genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
mach-shmobile libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
mach-socfpga genalloc: add name arg to gen_pool_get() and devm_gen_pool_create() 2015-09-04 16:54:41 -07:00
mach-spear ARM: SoC cleanups for v4.3 2015-09-01 12:10:20 -07:00
mach-sti ARM: SoC platform updates for v4.3 2015-09-01 12:18:40 -07:00
mach-stm32
mach-sunxi
mach-tegra ARM: SoC driver updates for v4.3 2015-09-01 13:00:04 -07:00
mach-u300
mach-uniphier ARM: uniphier: drop v7_invalidate_l1 call at secondary entry 2015-08-13 12:12:10 +02:00
mach-ux500 Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-03 16:27:01 -07:00
mach-versatile
mach-vexpress irqchip/gic: Ensure gic_cpu_if_up/down() programs correct GIC instance 2015-08-04 14:14:06 +02:00
mach-vt8500
mach-w90x900 ARM: kill off set_irq_flags usage 2015-07-28 13:58:13 +02:00
mach-zx ARM: SoC platform updates for v4.3 2015-09-01 12:18:40 -07:00
mach-zynq Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-01 14:33:35 -07:00
mm ARM: remove user cmpxchg syscall 2015-10-03 16:36:45 +01:00
net ARM: net: add support for BPF_ANC | SKF_AD_HATYPE in ARM JIT. 2015-07-27 14:57:41 -07:00
nwfpe ARM: swpan: fix nwfpe for uaccess changes 2015-09-09 23:26:11 +01:00
oprofile
plat-iop
plat-omap
plat-orion genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
plat-pxa
plat-samsung ARM: SAMSUNG: remove keypad-core header in plat-samsung 2015-07-30 02:02:06 +09:00
plat-versatile
probes
tools
vdso ARM: 8405/1: VDSO: fix regression with toolchains lacking ld.bfd executable 2015-07-31 18:54:45 +01:00
vfp
xen Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-14 12:24:10 -07:00
Kconfig ARM: 8434/2: Revert "7655/1: smp_twd: make twd_local_timer_of_register() no-op for nosmp" 2015-10-03 16:36:44 +01:00
Kconfig-nommu
Kconfig.debug The i.MX SoC changes for 4.3: 2015-08-18 13:10:05 -07:00
Makefile ARM: 8429/1: disable GCC SRA optimization 2015-09-07 13:24:05 +01:00