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linux/arch/powerpc/kernel
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Nicholas Piggin f35d2f249e powerpc/64s: Fix copy-paste data exposure into newly created tasks 
copy-paste contains implicit "copy buffer" state that can contain
arbitrary user data (if the user process executes a copy instruction).
This could be snooped by another process if a context switch hits while
the state is live. So cp_abort is executed on context switch to clear
out possible sensitive data and prevent the leak.

cp_abort is done after the low level _switch(), which means it is never
reached by newly created tasks, so they could snoop on this buffer
between their first and second context switch.

Fix this by doing the cp_abort before calling _switch. Add some
comments which should make the issue harder to miss.

Fixes: 07d2a628bc ("powerpc/64s: Avoid cpabort in context switch when possible")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210622053036.474678-1-npiggin@gmail.com
2021-06-25 00:07:11 +10:00
..
ptrace
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
syscalls
Merge tag 'landlock_v34' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2021-05-01 18:50:44 -07:00
trace
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
vdso32
Merge tag 'powerpc-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2021-04-30 12:22:28 -07:00
vdso64
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
align.c
powerpc: Rename probe_kernel_read_inst()
2021-04-21 22:52:33 +10:00
asm-offsets.c
powerpc/64: use interrupt restart table to speed up return from interrupt
2021-06-25 00:06:56 +10:00
audit.c
…
btext.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cacheinfo.c
powerpc/cacheinfo: Print correct cache-sibling map/list for L2 cache
2020-12-11 00:10:25 +11:00
cacheinfo.h
…
compat_audit.c
…
cpu_setup_6xx.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
cpu_setup_44x.S
…
cpu_setup_fsl_booke.S
powerpc: Retire e200 core (mpc555x processor)
2020-12-05 21:49:18 +11:00
cpu_setup_pa6t.S
…
cpu_setup_power.c
powerpc/perf: MMCR0 control for PMU registers under PMCC=00
2020-12-04 01:01:29 +11:00
cpu_setup_ppc970.S
…
cputable.c
arch: powerpc: Stop building and using oprofile
2021-01-29 10:05:51 +05:30
crash_dump.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
dawr.c
powerpc/watchpoint: Guest support for 2nd DAWR hcall
2020-07-26 23:34:19 +10:00
dbell.c
powerpc: handle irq_enter/irq_exit in interrupt handler wrappers
2021-02-09 00:10:49 +11:00
dma-iommu.c
powerpc/dma: Fallback to dma_ops when persistent memory present
2020-11-27 10:33:42 +01:00
dma-mask.c
…
dma-swiotlb.c
…
dt_cpu_ftrs.c
arch: powerpc: Stop building and using oprofile
2021-01-29 10:05:51 +05:30
early_32.c
powerpc/fsl_booke/32: implement KASLR infrastructure
2019-11-13 19:27:40 +11:00
eeh_cache.c
powerpc/eeh_cache: Fix a possible debugfs deadlock
2020-11-02 12:54:20 +11:00
eeh_driver.c
Merge tag 'pci-v5.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
2020-08-07 18:48:15 -07:00
eeh_event.c
powerpc/eeh: Fix build with STACKTRACE=n
2019-09-14 00:01:14 +10:00
eeh_pe.c
powerpc/eeh: Delete eeh_pe->config_addr
2020-10-07 22:34:47 +11:00
eeh_sysfs.c
powerpc/eeh: Pass eeh_dev to eeh_ops->resume_notify()
2020-07-26 23:34:20 +10:00
eeh.c
powerpc: Fix reverse map real-mode address lookup with huge vmalloc
2021-05-28 22:54:27 +10:00
entry_32.S
powerpc/32: Reduce code duplication of system call entry
2021-06-25 00:07:10 +10:00
entry_64.S
powerpc/64: move interrupt return asm to interrupt_64.S
2021-06-25 00:06:55 +10:00
epapr_hcalls.S
…
epapr_paravirt.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
exceptions-64e.S
powerpc/64: treat low kernel text as irqs soft-masked
2021-06-25 00:06:56 +10:00
exceptions-64s.S
powerpc/64: treat low kernel text as irqs soft-masked
2021-06-25 00:06:56 +10:00
fadump.c
powerpc/fadump: Fix sparse warnings
2021-04-22 20:59:04 +10:00
firmware.c
powerpc: Reintroduce is_kvm_guest() as a fast-path check
2020-12-04 01:01:22 +11:00
fpu.S
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
fsl_booke_entry_mapping.S
powerpc/fsl_booke/32: implement KASLR infrastructure
2019-11-13 19:27:40 +11:00
head_8xx.S
powerpc: Define swapper_pg_dir[] in C
2021-06-17 00:09:10 +10:00
head_32.h
powerpc/32: Reduce code duplication of system call entry
2021-06-25 00:07:10 +10:00
head_40x.S
powerpc: Define swapper_pg_dir[] in C
2021-06-17 00:09:10 +10:00
head_44x.S
powerpc: Define swapper_pg_dir[] in C
2021-06-17 00:09:10 +10:00
head_64.S
powerpc/64: move interrupt return asm to interrupt_64.S
2021-06-25 00:06:55 +10:00
head_book3s_32.S
powerpc: Remove klimit
2021-06-25 00:07:10 +10:00
head_booke.h
powerpc/32: Avoid #ifdef nested with FTR_SECTION on booke syscall entry
2021-06-25 00:07:11 +10:00
head_fsl_booke.S
powerpc: Define swapper_pg_dir[] in C
2021-06-17 00:09:10 +10:00
hw_breakpoint_constraints.c
powerpc/uaccess: Remove __get/put_user_inatomic()
2021-04-03 21:21:41 +11:00
hw_breakpoint.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
idle_6xx.S
powerpc/32: Return directly from power_save_ppc32_restore()
2021-03-29 13:22:10 +11:00
idle_book3e.S
…
idle_book3s.S
powerpc/64s: power4 nap fixup in C
2021-04-08 21:17:45 +10:00
idle_e500.S
powerpc/32: Return directly from power_save_ppc32_restore()
2021-03-29 13:22:10 +11:00
idle.c
sched/idle: Fix arch_cpu_idle() vs tracing
2020-11-24 16:47:35 +01:00
ima_arch.c
powerpc/ima: Fix secure boot rules in ima arch policy
2020-05-07 17:25:54 +10:00
interrupt_64.S
powerpc/64: use interrupt restart table to speed up return from interrupt
2021-06-25 00:06:56 +10:00
interrupt.c
powerpc/64s/interrupt: Check and fix srr_valid without crashing
2021-06-25 00:06:57 +10:00
io-workarounds.c
powerpc: Fix reverse map real-mode address lookup with huge vmalloc
2021-05-28 22:54:27 +10:00
io.c
…
iomap.c
powerpc: inline iomap accessors
2020-12-04 01:01:09 +11:00
iommu.c
Revert "powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs"
2021-06-01 11:17:08 +10:00
irq.c
powerpc/64: interrupt soft-enable race fix
2021-06-25 00:06:56 +10:00
isa-bridge.c
mm/vmalloc: remove unmap_kernel_range
2021-04-30 11:20:40 -07:00
jump_label.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
kgdb.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
kprobes-ftrace.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
kprobes.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
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
powerpc: Drop SYNC_601() ISYNC_601() and SYNC()
2020-10-08 21:17:13 +11:00
legacy_serial.c
powerpc/legacy_serial: Fix UBSAN: array-index-out-of-bounds
2021-05-12 11:07:39 +10:00
Makefile
powerpc/vdso: Make sure vdso_wrapper.o is rebuilt everytime vdso.so is rebuilt
2021-04-02 00:18:09 +11:00
mce_power.c
powerpc/powernv: Fix machine check reporting of async store errors
2021-06-21 21:13:19 +10:00
mce.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
misc_32.S
powerpc/32: Remove __main()
2021-06-17 00:09:10 +10:00
misc_64.S
powerpc/irq: Inline call_do_irq() and call_do_softirq()
2021-03-29 13:22:17 +11:00
misc.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
module_32.c
powerpc/modules: Use PPC_RAW_xx() macros
2021-06-16 00:16:48 +10:00
module_64.c
powerpc/modules: Use PPC_RAW_xx() macros
2021-06-16 00:16:48 +10:00
module.c
powerpc/modules: Make module_alloc() Strict Module RWX aware
2021-06-21 21:13:20 +10:00
msi.c
…
note.S
…
nvram_64.c
printk: introduce a kmsg_dump iterator
2021-03-08 11:43:27 +01:00
of_platform.c
powerpc/eeh: Remove eeh_dev_phb_init_dynamic()
2020-07-26 23:34:19 +10:00
optprobes_head.S
powerpc: Enable OPTPROBES on PPC32
2021-04-21 22:52:32 +10:00
optprobes.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
paca.c
powerpc/paca: Remove mm_ctx_id and mm_ctx_slb_addr_limit
2021-05-17 15:27:15 +10:00
pci_32.c
…
pci_64.c
mm/vmalloc: remove unmap_kernel_range
2021-04-30 11:20:40 -07:00
pci_dn.c
powerpc/pci: Move PHB discovery for PCI_DN using platforms
2021-02-09 00:01:05 +11:00
pci_of_scan.c
powerpc/pci: Remove pcibios_setup_bus_devices()
2020-01-06 16:25:29 +11:00
pci-common.c
powerpc/pci: Add ppc_md.discover_phbs()
2021-02-03 09:46:36 +11:00
pci-hotplug.c
powerpc/eeh: Release EEH device state synchronously
2020-05-18 21:58:44 +10:00
pmc.c
…
ppc32.h
…
ppc_save_regs.S
powerpc: Improve ppc_save_regs()
2020-04-04 21:40:57 +11:00
proc_powerpc.c
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
process.c
powerpc/64s: Fix copy-paste data exposure into newly created tasks
2021-06-25 00:07:11 +10:00
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/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
prom_parse.c
…
prom.c
powerpc: Remove klimit
2021-06-25 00:07:10 +10:00
reloc_32.S
…
reloc_64.S
…
rtas_flash.c
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
rtas_pci.c
mm: reorder includes after introduction of linux/pgtable.h
2020-06-09 09:39:13 -07:00
rtas-proc.c
powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE
2021-04-14 23:04:16 +10:00
rtas-rtc.c
…
rtas.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
rtasd.c
powerpc/rtasd: simplify handle_rtas_event(), emit message on events
2020-07-16 13:12:38 +10:00
secure_boot.c
powerpc/pseries: Detect secure and trusted boot state of the system.
2020-07-16 14:49:53 +10:00
security.c
powerpc/security: Add a security feature for STF barrier
2021-06-21 21:13:19 +10:00
secvar-ops.c
powerpc/powernv: Add OPAL API interface to access secure variable
2019-11-13 00:33:22 +11:00
secvar-sysfs.c
powerpc: expose secure variables to userspace via sysfs
2019-11-13 00:33:22 +11:00
setup_32.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
setup_64.c
powerpc/pseries: Enable hardlockup watchdog for PowerVM partitions
2021-06-25 00:07:09 +10:00
setup-common.c
powerpc: Remove klimit
2021-06-25 00:07:10 +10:00
setup.h
powerpc: remove unneeded semicolons
2021-02-09 00:10:50 +11:00
signal_32.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
signal_64.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
signal.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
signal.h
powerpc/signal: Fix possible build failure with unsafe_copy_fpr_{to/from}_user
2021-05-12 11:07:39 +10:00
smp-tbsync.c
…
smp.c
powerpc: Offline CPU in stop_this_cpu()
2021-06-25 00:07:09 +10:00
stacktrace.c
powerpc: make stack walking KASAN-safe
2021-06-17 00:09:11 +10:00
suspend.c
…
swsusp_32.S
powerpc/32: Blacklist functions running with MMU disabled for kprobe
2020-06-02 20:59:11 +10:00
swsusp_64.c
…
swsusp_asm64.S
…
swsusp_booke.S
…
swsusp.c
…
sys_ppc32.c
powerpc/compat_sys: swap hi/lo parts of 64-bit syscall args in LE mode
2021-02-11 23:35:07 +11:00
syscalls.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
sysfs.c
powerpc/sysfs: Remove unused 'err' variable in sysfs_create_dscr_default()
2020-09-18 20:05:24 +10:00
systbl_chk.sh
…
systbl.S
powerpc/syscalls: switch to generic syscalltbl.sh
2021-04-14 23:04:16 +10:00
tau_6xx.c
powerpc/tau: Remove superfluous parameter in alloc_workqueue() call
2021-06-15 23:47:10 +10:00
time.c
powerpc/64s: Remove irq mask workaround in accumulate_stolen_time()
2021-06-25 00:07:09 +10:00
tm.S
powerpc/tm: Save and restore AMR on treclaim and trechkpt
2020-10-06 23:22:25 +11:00
traps.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
ucall.S
…
udbg_16550.c
powerpc/microwatt: Use standard 16550 UART for console
2021-06-21 21:16:31 +10:00
udbg.c
powerpc/udbg: Make it safe to call udbg_printf() always
2019-10-11 19:33:25 +11:00
uprobes.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
vdso32_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso64_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso.c
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
vecemu.c
powerpc: Define and use get_user_instr() et. al.
2020-05-19 00:10:37 +10:00
vector.S
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
vmlinux.lds.S
powerpc/64: allow alternate return locations for soft-masked interrupts
2021-06-25 00:06:56 +10:00
watchdog.c
powerpc/watchdog: include linux/processor.h for spin_until_cond
2021-06-17 00:09:12 +10:00