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Milton Miller 978bef91ca powerpc/vdso: Fix vdso cpu truncation 
[ Upstream commit a9f675f950 ]

The code in vdso_cpu_init that exposes the cpu and numa node to
userspace via SPRG_VDSO incorrctly masks the cpu to 12 bits. This means
that any kernel running on a box with more than 4096 threads (NR_CPUS
advertises a limit of of 8192 cpus) would expose userspace to two cpu
contexts running at the same time with the same cpu number.

Note: I'm not aware of any distro shipping a kernel with support for more
than 4096 threads today, nor of any system image that currently exceeds
4096 threads. Found via code browsing.

Fixes: 18ad51dd34 ("powerpc: Add VDSO version of getcpu")
Signed-off-by: Milton Miller <miltonm@us.ibm.com>
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200715233704.1352257-1-anton@ozlabs.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-08-19 08:16:12 +02:00
..
syscalls
powerpc: Wire up clone3 syscall
2019-07-29 09:34:27 +10:00
trace
powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
2019-09-18 12:24:55 +10:00
vdso32
powerpc: Fix vDSO clock_getres()
2019-12-17 19:56:47 +01:00
vdso64
powerpc: Fix vDSO clock_getres()
2019-12-17 19:56:47 +01:00
.gitignore
powerpc: improve prom_init_check rule
2019-09-14 00:04:41 +10:00
align.c
powerpc/spe: Mark expected switch fall-throughs
2019-07-31 00:19:34 +10:00
asm-offsets.c
powerpc: Fix vDSO clock_getres()
2019-12-17 19:56:47 +01:00
audit.c
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btext.c
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cacheinfo.c
Merge tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2019-07-13 16:08:36 -07:00
cacheinfo.h
powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
2019-06-15 16:52:06 +10:00
compat_audit.c
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cpu_setup_6xx.S
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2019-05-30 11:26:32 -07:00
cpu_setup_44x.S
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2019-05-30 11:26:32 -07:00
cpu_setup_fsl_booke.S
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2019-05-30 11:26:32 -07:00
cpu_setup_pa6t.S
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2019-06-05 17:37:06 +02:00
cpu_setup_power.S
powerpc/64s: Set reserved PCR bits
2019-09-21 08:36:53 +10:00
cpu_setup_ppc970.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cputable.c
powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems
2020-03-12 13:00:31 +01:00
crash_dump.c
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2019-06-19 17:09:06 +02:00
crash.c
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2019-06-19 17:09:06 +02:00
dawr.c
powerpc: Fix compile issue with force DAWR
2019-07-03 15:19:35 +10:00
dbell.c
KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag
2019-09-24 12:46:26 +10:00
dma-iommu.c
Merge tag 'powerpc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2019-09-20 11:48:06 -07:00
dma-mask.c
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dma-swiotlb.c
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2019-05-30 11:26:32 -07:00
dt_cpu_ftrs.c
powerpc/64s: Don't let DT CPU features set FSCR_DSCR
2020-06-22 09:31:23 +02:00
early_32.c
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eeh_cache.c
powerpc/eeh: Convert log messages to eeh_edev_* macros
2019-08-22 23:12:47 +10:00
eeh_dev.c
powerpc/eeh: Add bdfn field to eeh_dev
2019-08-22 23:12:46 +10:00
eeh_driver.c
powerpc/eeh: Fix deadlock handling dead PHB
2020-02-28 17:22:17 +01:00
eeh_event.c
powerpc/eeh: Fix build with STACKTRACE=n
2019-09-14 00:01:14 +10:00
eeh_pe.c
powerpc/eeh: Clean up EEH PEs after recovery finishes
2019-09-05 14:22:37 +10:00
eeh_sysfs.c
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eeh.c
powerpc/eeh: Fix eeh eeh_debugfs_break_device() with SRIOV devices
2019-09-27 09:04:17 +10:00
entry_32.S
powerpc/mm: Fix CONFIG_PPC_KUAP_DEBUG on PPC32
2020-04-29 16:33:25 +02:00
entry_64.S
powerpc/book3s64: Fix link stack flush on context switch
2019-11-29 10:10:31 +01:00
epapr_hcalls.S
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2019-05-30 11:26:32 -07:00
epapr_paravirt.c
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2019-06-05 17:30:28 +02:00
exceptions-64e.S
powerpc/64: optimise LOAD_REG_IMMEDIATE_SYM()
2019-08-27 13:03:36 +10:00
exceptions-64s.S
powerpc/64s/exception: Fix machine check no-loss idle wakeup
2020-06-24 17:50:28 +02:00
fadump.c
powerpc/fadump: Account for memory_limit while reserving memory
2020-06-22 09:31:22 +02:00
firmware.c
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2019-05-30 11:26:32 -07:00
fpu.S
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2019-05-30 11:26:32 -07:00
fsl_booke_entry_mapping.S
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head_8xx.S
powerpc/8xx: Fix clearing of bits 20-23 in ITLB miss
2020-02-28 17:22:17 +01:00
head_32.h
powerpc/32: replace LOAD_MSR_KERNEL() by LOAD_REG_IMMEDIATE()
2019-08-27 13:03:36 +10:00
head_32.S
powerpc/32s: use CONFIG_PPC_BOOK3S_601 instead of reading PVR
2019-08-28 23:19:33 +10:00
head_40x.S
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2019-05-30 11:26:32 -07:00
head_44x.S
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2019-05-30 11:26:32 -07:00
head_64.S
powerpc/64: Don't initialise init_task->thread.regs
2020-06-24 17:50:27 +02:00
head_booke.h
powerpc/32: fix build failure on book3e with KVM
2019-06-16 00:03:38 +10:00
head_fsl_booke.S
powerpc/kasan: Fix boot failure with RELOCATABLE && FSL_BOOKE
2020-01-26 10:00:59 +01:00
hw_breakpoint.c
powerpc/watchpoint: Disable watchpoint hit by larx/stcx instructions
2019-09-12 09:27:00 +10:00
idle_6xx.S
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2019-05-30 11:26:32 -07:00
idle_book3e.S
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2019-05-30 11:26:32 -07:00
idle_book3s.S
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2019-05-30 11:26:32 -07:00
idle_e500.S
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2019-05-30 11:26:32 -07:00
idle_power4.S
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2019-05-30 11:26:32 -07:00
idle.c
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2019-05-30 11:26:32 -07:00
ima_kexec.c
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2019-05-30 11:26:32 -07:00
io-workarounds.c
powerpc/mm: rework io-workaround invocation.
2019-08-27 13:03:34 +10:00
io.c
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2019-05-30 11:26:32 -07:00
iomap.c
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iommu.c
Merge branch 'topic/ppc-kvm' into next
2019-08-30 09:52:57 +10:00
irq.c
powerpc/irq: fix stack overflow verification
2019-12-31 16:46:29 +01:00
isa-bridge.c
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2019-05-30 11:26:32 -07:00
jump_label.c
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2019-05-30 11:26:32 -07:00
kexec_elf_64.c
kexec: add KEXEC_ELF
2019-09-06 23:58:43 +02:00
kgdb.c
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kprobes-ftrace.c
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2019-05-30 11:26:35 -07:00
kprobes.c
powerpc/kprobes: Ignore traps that happened in real mode
2020-04-17 10:50:23 +02:00
kvm_emul.S
powerpc/kvm: Add ifdefs around template code
2019-09-14 00:04:40 +10:00
kvm.c
powerpc/kvm: Explicitly mark kvm guest code as __init
2019-09-14 00:04:40 +10:00
l2cr_6xx.S
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2019-05-24 17:36:45 +02:00
legacy_serial.c
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machine_kexec_32.c
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2019-06-19 17:09:06 +02:00
machine_kexec_64.c
powerpc/pseries/svm: Unshare all pages before kexecing a new kernel
2019-08-30 09:55:40 +10:00
machine_kexec_file_64.c
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2019-06-05 17:36:37 +02:00
machine_kexec.c
powerpc/crashkernel: Take "mem=" option into account
2020-06-24 17:50:18 +02:00
Makefile
powerpc: Make setjmp/longjmp signature standard
2020-04-17 10:50:23 +02:00
mce_power.c
powerpc/mm/mce: Keep irqs disabled during lockless page table walk
2019-09-19 21:24:59 +10:00
mce.c
powerpc/64s/pseries: machine check convert to use common event code
2019-08-30 10:32:35 +10:00
misc_32.S
powerpc: Convert flush_icache_range & friends to C
2020-03-12 13:00:25 +01:00
misc_64.S
powerpc: Convert flush_icache_range & friends to C
2020-03-12 13:00:25 +01:00
misc.S
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2019-05-30 11:26:32 -07:00
module_32.c
Merge tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2019-07-13 16:08:36 -07:00
module_64.c
Merge tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2019-07-13 16:08:36 -07:00
module.c
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2019-05-30 11:26:35 -07:00
module.lds
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msi.c
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2019-05-30 11:26:32 -07:00
note.S
powerpc: Add PowerPC Capabilities ELF note
2019-08-30 09:40:15 +10:00
nvram_64.c
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2019-05-30 11:26:32 -07:00
of_platform.c
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2019-05-30 11:26:32 -07:00
optprobes_head.S
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2019-05-30 11:26:32 -07:00
optprobes.c
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2019-05-30 11:26:32 -07:00
paca.c
powerpc/pseries/svm: Fix incorrect check for shared_lppaca_size
2020-07-22 09:33:14 +02:00
pci_32.c
powerpc/64: Adjust order in pcibios_init()
2019-08-22 23:11:48 +10:00
pci_64.c
powerpc/64: Adjust order in pcibios_init()
2019-08-22 23:11:48 +10:00
pci_dn.c
powerpc/sriov: Remove VF eeh_dev state when disabling SR-IOV
2020-02-24 08:36:56 +01:00
pci_of_scan.c
powerpc/of/pci: Rewrite pci_parse_of_flags
2019-08-29 20:24:05 +10:00
pci-common.c
powerpc/64: Adjust order in pcibios_init()
2019-08-22 23:11:48 +10:00
pci-hotplug.c
powerpc/eeh: Fix race when freeing PDNs
2019-09-05 14:22:37 +10:00
pmc.c
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2019-05-30 11:26:32 -07:00
ppc32.h
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2019-05-30 11:26:32 -07:00
ppc_save_regs.S
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2019-05-30 11:26:32 -07:00
proc_powerpc.c
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2019-05-30 11:26:35 -07:00
process.c
powerpc: Fix kernel crash in show_instructions() w/DEBUG_VIRTUAL
2020-06-24 17:50:45 +02:00
prom_init_check.sh
powerpc/prom_init: Undo relocation before entering secure mode
2019-10-29 15:12:17 +11:00
prom_init.c
powerpc/prom_init: Pass the "os-term" message to hypervisor
2020-04-23 10:36:34 +02:00
prom_parse.c
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prom.c
powerpc/64s: Save FSCR to init_task.thread.fscr after feature init
2020-06-22 09:31:23 +02:00
ptrace32.c
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ptrace.c
ptrace: move clearing of TIF_SYSCALL_EMU flag to core
2019-06-05 17:51:17 +01:00
reloc_32.S
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2019-05-30 11:26:32 -07:00
reloc_64.S
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2019-05-30 11:26:32 -07:00
rtas_flash.c
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2019-05-30 11:26:32 -07:00
rtas_pci.c
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2019-05-30 11:26:35 -07:00
rtas-proc.c
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rtas-rtc.c
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rtas.c
powerpc/rtas: don't online CPUs for partition suspend
2020-08-19 08:16:12 +02:00
rtasd.c
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2019-05-30 11:26:32 -07:00
security.c
powerpc/security: Fix debugfs data leak on 32-bit
2020-01-26 10:00:59 +01:00
setup_32.c
powerpc/32: drop CPU_FTR_UNIFIED_ID_CACHE
2019-08-28 23:19:33 +10:00
setup_64.c
powerpc/setup_64: Set cache-line-size based on cache-block-size
2020-04-29 16:33:20 +02:00
setup-common.c
Merge tag 'powerpc-5.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2019-09-20 11:48:06 -07:00
setup.h
powerpc/64: Prevent stack protection in early boot
2020-04-17 10:50:23 +02:00
signal_32.c
powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
2020-02-28 17:22:17 +01:00
signal_64.c
powerpc/64/tm: Don't let userspace set regs->trap via sigreturn
2020-04-17 10:50:22 +02:00
signal.c
powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery
2020-02-28 17:22:17 +01:00
signal.h
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smp-tbsync.c
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smp.c
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2019-05-30 11:26:32 -07:00
stacktrace.c
powerpc/ftrace: Enable HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
2019-09-18 12:24:55 +10:00
suspend.c
PM: hibernate: powerpc: Expose pfn_is_nosave() prototype
2019-06-14 10:48:56 +02:00
swsusp_32.S
powerpc/32s: fix suspend/resume when IBATs 4-7 are used
2019-06-19 20:05:07 +10:00
swsusp_64.c
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2019-06-19 17:11:22 +02:00
swsusp_asm64.S
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2019-06-19 17:11:22 +02:00
swsusp_booke.S
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swsusp.c
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2019-05-30 11:26:32 -07:00
sys_ppc32.c
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2019-05-30 11:26:32 -07:00
syscalls.c
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2019-05-30 11:26:32 -07:00
sysfs.c
powerpc/pseries/svm: Export guest SVM status to user space via sysfs
2019-08-30 09:55:41 +10:00
systbl_chk.sh
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2019-05-30 11:26:32 -07:00
systbl.S
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2019-05-30 11:26:32 -07:00
tau_6xx.c
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time.c
Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled"
2020-04-29 16:33:01 +02:00
tm.S
powerpc/tm: update comment about interrupt re-entrancy
2019-07-02 21:39:49 +10:00
traps.c
powerpc/book3s/mm: Update Oops message to print the correct translation in use
2020-01-04 19:18:10 +01:00
ucall.S
powerpc/kernel: Add ucall_norets() ultravisor call handler
2019-08-30 09:40:15 +10:00
udbg_16550.c
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2019-05-30 11:26:32 -07:00
udbg.c
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2019-05-30 11:26:32 -07:00
uprobes.c
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2019-05-30 11:26:35 -07:00
vdso.c
powerpc/vdso: Fix vdso cpu truncation
2020-08-19 08:16:12 +02:00
vecemu.c
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vector.S
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vmlinux.lds.S
bpf: Support llvm-objcopy for vmlinux BTF
2020-06-17 16:40:20 +02:00
watchdog.c
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