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android_kernel_oneplus_msm8998/arch/mips/kernel
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Paul Burton 262ea6c0c4 MIPS: VDSO: Match data page cache colouring when D$ aliases 
commit 0f02cfbc3d9e413d450d8d0fd660077c23f67eff upstream.

When a system suffers from dcache aliasing a user program may observe
stale VDSO data from an aliased cache line. Notably this can break the
expectation that clock_gettime(CLOCK_MONOTONIC, ...) is, as its name
suggests, monotonic.

In order to ensure that users observe updates to the VDSO data page as
intended, align the user mappings of the VDSO data page such that their
cache colouring matches that of the virtual address range which the
kernel will use to update the data page - typically its unmapped address
within kseg0.

This ensures that we don't introduce aliasing cache lines for the VDSO
data page, and therefore that userland will observe updates without
requiring cache invalidation.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Reported-by: Hauke Mehrtens <hauke@hauke-m.de>
Reported-by: Rene Nielsen <rene.nielsen@microsemi.com>
Reported-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fixes: ebb5e78cc6 ("MIPS: Initial implementation of a VDSO")
Patchwork: https://patchwork.linux-mips.org/patch/20344/
Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-26 08:35:10 +02:00
..
.gitignore
8250-platform.c
asm-offsets.c MIPS: IRQ Stack: Unwind IRQ stack onto task stack 2017-10-08 10:14:19 +02:00
binfmt_elfn32.c
binfmt_elfo32.c
bmips_vec.S
branch.c MIPS: Fix a typo: s/preset/present/ in r2-to-r6 emulation error message 2017-07-27 15:06:08 -07:00
cevt-bcm1480.c MIPS: cevt-bcm1480: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-ds1287.c MIPS: cevt-ds1287: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-gt641xx.c MIPS: cevt-gt641xx: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-r4k.c MIPS: cevt-r4k: Migrate to new 'set-state' interface 2015-09-03 12:07:52 +02:00
cevt-sb1250.c MIPS: cevt-sb1250: Migrate to new 'set-state' interface 2015-09-03 12:07:52 +02:00
cevt-txx9.c MIPS: cevt-txx9: Migrate to new 'set-state' interface 2015-09-03 12:07:53 +02:00
cps-vec-ns16550.S MIPS: CPS: Early debug using an ns16550-compatible UART 2015-11-11 08:34:25 +01:00
cps-vec.S MIPS: CPS: drop .set mips64r2 directives 2015-12-22 12:16:32 +01:00
cpu-bugs64.c MIPS: kernel: cpu-bugs64: Do not check R6 cores for existing 64-bit bugs 2015-02-17 15:37:24 +00:00
cpu-probe.c MIPS: Extend hardware table walking support to MIPS64 2015-11-11 08:35:54 +01:00
crash.c MIPS: Fix crash registers on non-crashing CPUs 2017-05-02 21:19:49 -07:00
crash_dump.c
csrc-bcm1480.c MIPS: csrc-bcm1480: Implement read_sched_clock 2015-04-01 17:21:27 +02:00
csrc-ioasic.c MIPS: csrc-ioasic: Implement read_sched_clock 2015-04-01 17:21:28 +02:00
csrc-r4k.c MIPS: Don't register r4k sched clock when CPUFREQ enabled 2016-08-20 18:09:26 +02:00
csrc-sb1250.c MIPS: csrc-sb1250: Implement read_sched_clock 2015-04-01 17:21:33 +02:00
early_printk.c
early_printk_8250.c
elf.c MIPS: Avoid BUG warning in arch_check_elf 2017-05-02 21:19:55 -07:00
entry.S MIPS: Fix IRQ tracing & lockdep when rescheduling 2017-07-05 14:37:15 +02:00
ftrace.c
genex.S MIPS: IRQ Stack: Unwind IRQ stack onto task stack 2017-10-08 10:14:19 +02:00
gpio_txx9.c
head.S MIPS: Add support for vmlinux.bin appended dtb 2015-06-21 21:54:14 +02:00
i8253.c
idle.c Merge branch '4.3-fixes' into mips-for-linux-next 2015-11-12 11:36:03 +01:00
irq-gt641xx.c
irq-msc01.c
irq-rm7000.c
irq.c MIPS: Introduce irq_stack 2017-04-18 07:14:35 +02:00
irq_txx9.c
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c MIPS: KGDB: Use kernel context for sleeping threads 2017-05-02 21:19:55 -07:00
kprobes.c
linux32.c
machine_kexec.c
Makefile MIPS: CPS: Early debug using an ns16550-compatible UART 2015-11-11 08:34:25 +01:00
mcount.S mips: ftrace: fix static function graph tracing 2018-07-03 11:21:28 +02:00
mips-cm.c MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core 2015-11-11 08:35:18 +01:00
mips-cpc.c MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core 2015-11-11 08:35:18 +01:00
mips-mt-fpaff.c MIPS: Fix sched_getaffinity with MT FPAFF enabled 2015-08-03 09:25:02 +02:00
mips-mt.c
mips-r2-to-r6-emul.c MIPS: r2-on-r6-emu: Clear BLTZALL and BGEZALL debugfs counters 2018-03-22 09:23:25 +01:00
mips_ksyms.c MIPS: uaccess: Take EVA into account in [__]clear_user 2015-12-22 11:58:43 +01:00
mips_machine.c
module-rela.c
module.c mm: vmalloc: pass additional vm_flags to __vmalloc_node_range() 2015-02-13 21:21:42 -08:00
octeon_switch.S MIPS: Fix octeon FP context switch handling 2015-10-02 19:16:06 +02:00
perf_event.c
perf_event_mipsxx.c MIPS: Add cases for CPU_I6400 2015-08-26 15:23:03 +02:00
pm-cps.c MIPS: pm-cps: Drop manual cache-line alignment of ready_count 2017-07-05 14:37:15 +02:00
pm.c MIPS: Fix watchpoint restoration 2016-06-07 18:14:30 -07:00
proc.c MIPS: Fix MIPS I ISA /proc/cpuinfo reporting 2017-07-27 15:06:07 -07:00
process.c kthread: fix boot hang (regression) on MIPS/OpenRISC 2018-09-19 22:48:55 +02:00
prom.c MIPS: Fix build with CONFIG_OF=y for non OF-enabled targets 2015-08-03 09:25:00 +02:00
ptrace.c MIPS: Correct the 64-bit DSP accumulator register size 2018-09-05 09:18:40 +02:00
ptrace32.c MIPS: Correct the 64-bit DSP accumulator register size 2018-09-05 09:18:40 +02:00
r4k_fpu.S MIPS: Use copy_s.fmt rather than copy_u.fmt 2016-06-07 18:14:31 -07:00
r4k_switch.S MIPS: Tidy up FPU context switching 2015-09-03 12:08:05 +02:00
r2300_fpu.S
r2300_switch.S MIPS: Fix R2300 FP context switch handling 2015-10-02 19:16:46 +02:00
r6000_fpu.S
relocate_kernel.S MIPS: Replace add and sub instructions in relocate_kernel.S with addiu 2015-08-03 15:26:30 +02:00
reset.c MIPS: Provide fallback reboot/poweroff/halt implementations 2015-04-01 17:21:58 +02:00
rtlx-cmp.c
rtlx-mt.c
rtlx.c
scall32-o32.S MIPS: Save static registers before sysmips 2017-07-27 15:06:07 -07:00
scall64-64.S MIPS: Save static registers before sysmips 2017-07-27 15:06:07 -07:00
scall64-n32.S MIPS: Save static registers before sysmips 2017-07-27 15:06:07 -07:00
scall64-o32.S MIPS: Save static registers before sysmips 2017-07-27 15:06:07 -07:00
segment.c MIPS: Declare mips_debugfs_dir in a header 2015-10-26 09:49:42 +01:00
setup.c MIPS: init: Ensure reserved memory regions are not added to bootmem 2017-11-21 09:21:22 +01:00
signal-common.h MIPS: Save MSA extended context around signals 2015-09-03 12:07:59 +02:00
signal.c MIPS: Fix sigreturn via VDSO on microMIPS kernel 2016-06-07 18:14:31 -07:00
signal32.c MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
signal_n32.c MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
smp-bmips.c MIPS: BMIPS: Do not mask IPIs during suspend 2018-03-18 11:17:49 +01:00
smp-cmp.c mips: fix up obsolete cpu function usage. 2015-03-05 15:25:06 +10:30
smp-cps.c MIPS: CM: make use of mips_cm_{lock,unlock}_other 2015-11-11 08:35:17 +01:00
smp-gic.c MIPS: CM: make use of mips_cm_{lock,unlock}_other 2015-11-11 08:35:17 +01:00
smp-mt.c mips: fix up obsolete cpu function usage. 2015-03-05 15:25:06 +10:30
smp-up.c
smp.c MIPS: SMP: Fix deadlock & online race 2017-11-15 17:13:12 +01:00
spinlock_test.c MIPS: Declare mips_debugfs_dir in a header 2015-10-26 09:49:42 +01:00
spram.c MIPS: Add cases for CPU_I6400 2015-08-26 15:23:03 +02:00
stacktrace.c MIPS: Add LATENCYTOP support 2015-11-11 08:36:46 +01:00
sync-r4k.c
syscall.c MIPS: Save static registers before sysmips 2017-07-27 15:06:07 -07:00
sysrq.c MIPS: Refactor dumping of TLB registers for r3k/r4k 2015-09-03 12:07:45 +02:00
time.c
topology.c
traps.c MIPS: Call dump_stack() from show_regs() 2018-07-22 14:25:53 +02:00
unaligned.c MIPS: Fix MSA ld unaligned failure cases 2016-04-20 15:42:08 +09:00
uprobes.c MIPS: uprobes: fix use of uninitialised variable 2016-10-07 15:23:43 +02:00
vdso.c MIPS: VDSO: Match data page cache colouring when D$ aliases 2018-09-26 08:35:10 +02:00
vmlinux.lds.S MIPS: Ensure bss section ends on a long-aligned address 2017-10-08 10:14:16 +02:00
vpe-cmp.c
vpe-mt.c
vpe.c MIPS: MT: Remove "weak" from vpe_run() declaration 2015-08-26 15:23:40 +02:00
watch.c MIPS: Fix watchpoint restoration 2016-06-07 18:14:30 -07:00