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linux/arch/powerpc/kernel
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Nicholas Piggin aee101d7b9 powerpc/64s: Mask SRR0 before checking against the masked NIP 
Commit 314f6c23dd ("powerpc/64s: Mask NIP before checking against
SRR0") masked off the low 2 bits of the NIP value in the interrupt
stack frame in case they are non-zero and mis-compare against a SRR0
register value of a CPU which always reads back 0 from the 2 low bits
which are reserved.

This now causes the opposite problem that an implementation which does
implement those bits in SRR0 will mis-compare against the masked NIP
value in which they have been cleared. QEMU is one such implementation,
and this is allowed by the architecture.

This can be triggered by sigfuz by setting low bits of PT_NIP in the
signal context.

Fix this for now by masking the SRR0 bits as well. Cleaner is probably
to sanitise these values before putting them in registers or stack, but
this is the quick and backportable fix.

Fixes: 314f6c23dd ("powerpc/64s: Mask NIP before checking against SRR0")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220117134403.2995059-1-npiggin@gmail.com
2022-01-18 10:25:18 +11:00
..
ptrace powerpc: Snapshot thread flags 2021-12-01 00:06:44 +01:00
syscalls futex: Wireup futex_waitv syscall 2021-11-25 14:26:12 +01:00
trace powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
vdso32 powerpc updates for 5.13 2021-04-30 12:22:28 -07:00
vdso64 powerpc/vdso: Don't use r30 to avoid breaking Go lang 2021-07-29 23:13:12 +10:00
.gitignore
align.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
asm-offsets.c powerpc/config: Add CONFIG_BOOKE_OR_40x 2021-12-09 22:41:19 +11:00
audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
btext.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
cacheinfo.c powerpc/cacheinfo: use default_groups in kobj_type 2022-01-05 10:58:23 +11:00
cacheinfo.h
compat_audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
cpu_setup_6xx.S
cpu_setup_44x.S
cpu_setup_fsl_booke.S
cpu_setup_pa6t.S
cpu_setup_power.c powerpc/64s: Always set PMU control registers to frozen/disabled when not in use 2021-11-24 21:08:57 +11:00
cpu_setup_ppc970.S
cputable.c
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: rename powerpc_debugfs_root to arch_debugfs_dir 2021-08-13 22:04:26 +10:00
dbell.c powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use 2021-12-16 21:31:45 +11:00
dma-iommu.c powerpc/iommu: Report the correct most efficient DMA mask for PCI devices 2021-09-30 17:10:17 +10:00
dma-mask.c
dma-swiotlb.c
dt_cpu_ftrs.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
early_32.c
eeh.c pci-v5.16-changes 2021-11-06 14:36:12 -07:00
eeh_cache.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
eeh_driver.c powerpc/eeh: Use a goto for recovery failures 2021-11-25 11:25:31 +11:00
eeh_event.c
eeh_pe.c
eeh_sysfs.c
entry_32.S powerpc/config: Add CONFIG_BOOKE_OR_40x 2021-12-09 22:41:19 +11:00
entry_64.S powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU 2021-12-09 22:41:13 +11:00
epapr_hcalls.S
epapr_paravirt.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
exceptions-64e.S powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
exceptions-64s.S powerpc/64/asm: Do not reassign labels 2021-12-23 22:35:12 +11:00
fadump.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
firmware.c powerpc: fix unbalanced node refcount in check_kvm_guest() 2021-10-09 00:15:59 +11:00
fpu.S powerpc/64s/interrupt: handle MSR EE and RI in interrupt entry wrapper 2021-12-16 21:31:45 +11:00
fsl_booke_entry_mapping.S powerpc/booke: Avoid link stack corruption in several places 2021-08-25 13:35:47 +10:00
head_8xx.S powerpc/8xx: Fix pinned TLBs with CONFIG_STRICT_KERNEL_RWX 2021-11-16 21:37:10 +11:00
head_32.h powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
head_40x.S powerpc/kuap: Wire-up KUAP on 40x 2021-12-09 22:41:20 +11:00
head_44x.S powerpc/kuap: Wire-up KUAP on 44x 2021-12-09 22:41:20 +11:00
head_64.S powerpc/64/asm: Do not reassign labels 2021-12-23 22:35:12 +11:00
head_book3s_32.S powerpc/32s: Do kuep_lock() and kuep_unlock() in assembly 2021-12-09 22:41:17 +11:00
head_booke.h powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
head_fsl_booke.S powerpc/kuap: Wire-up KUAP on 85xx in 32 bits mode. 2021-12-09 22:41:20 +11:00
hw_breakpoint.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
hw_breakpoint_constraints.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
idle.c powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
idle_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
idle_book3e.S
idle_book3s.S powerpc/idle: Don't corrupt back chain when going idle 2021-10-20 21:37:58 +11:00
idle_e500.S
ima_arch.c
interrupt.c powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
interrupt_64.S powerpc/64s: Mask SRR0 before checking against the masked NIP 2022-01-18 10:25:18 +11:00
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
iommu.c powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
irq.c powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use 2021-12-16 21:31:45 +11:00
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
kdebugfs.c powerpc: rename powerpc_debugfs_root to arch_debugfs_dir 2021-08-13 22:04:26 +10:00
kgdb.c powerpc/config: Add CONFIG_BOOKE_OR_40x 2021-12-09 22:41:19 +11:00
kprobes-ftrace.c ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
kprobes.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
kvm.c gup: Turn fault_in_pages_{readable,writeable} into fault_in_{readable,writeable} 2021-10-18 16:33:03 +02:00
kvm_emul.S
l2cr_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +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 updates for 5.17 2022-01-14 15:17:26 +01:00
mce.c powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU 2021-12-09 22:41:13 +11:00
mce_power.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
misc.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
misc_32.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
misc_64.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
module.c powerpc/modules: Don't WARN on first module allocation attempt 2021-11-30 22:44:32 +11:00
module_32.c powerpc/ftrace: Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on PPC32 2021-11-29 22:49:29 +11:00
module_64.c powerpc/module_64: Fix livepatching for RO modules 2021-12-14 23:13:03 +11:00
msi.c
note.S
nvram_64.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
of_platform.c
optprobes.c powerpc/inst: Define ppc_inst_t as u32 on PPC32 2021-12-09 22:41:21 +11:00
optprobes_head.S powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
paca.c powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU 2021-12-09 22:41:13 +11:00
pci-common.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
pci-hotplug.c
pci_32.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
pci_64.c mm/vmalloc: remove unmap_kernel_range 2021-04-30 11:20:40 -07:00
pci_dn.c
pci_of_scan.c
pmc.c
ppc32.h
ppc_save_regs.S
proc_powerpc.c
process.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
prom.c powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
prom_init.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
prom_init_check.sh
prom_parse.c
reloc_32.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
reloc_64.S
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 powerpc/rtas-rtc: remove unused constant 2021-06-25 14:47:20 +10:00
rtas.c powerpc/rtas: rtas_busy_delay_time() kernel-doc 2021-11-25 11:25:33 +11:00
rtas_flash.c
rtas_pci.c
rtasd.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
secure_boot.c
security.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
secvar-ops.c
secvar-sysfs.c
setup-common.c powerpc: Mark probe_machine() __init and static 2021-11-29 22:49:26 +11:00
setup.h powerpc/config: Add CONFIG_BOOKE_OR_40x 2021-12-09 22:41:19 +11:00
setup_32.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
setup_64.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
signal.c entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume() 2021-09-22 10:24:01 -04:00
signal.h powerpc/signal32: Fix sigset_t copy 2021-11-16 21:24:16 +11:00
signal_32.c powerpc/signal32: Use struct_group() to zero spe regs 2021-12-02 10:39:00 +11:00
signal_64.c signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-19 09:15:58 -06:00
smp-tbsync.c
smp.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
stacktrace.c kprobes: treewide: Make it harder to refer kretprobe_trampoline directly 2021-09-30 21:24:06 -04:00
static_call.c powerpc/32: Add support for out-of-line static calls 2021-10-22 15:22:05 +11:00
suspend.c
swsusp.c
swsusp_32.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
swsusp_64.c powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
swsusp_asm64.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
swsusp_booke.S
sys_ppc32.c
syscalls.c powerpc/syscalls: Simplify do_mmap2() 2021-08-25 13:35:48 +10:00
sysfs.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
systbl.S powerpc/syscalls: switch to generic syscalltbl.sh 2021-04-14 23:04:16 +10:00
systbl_chk.sh
tau_6xx.c powerpc/tau: Add 'static' storage qualifier to 'tau_work' definition 2021-08-20 17:00:53 +10:00
time.c powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use 2021-12-16 21:31:45 +11:00
tm.S powerpc: flexible GPR range save/restore macros 2021-11-29 23:15:20 +11:00
traps.c powerpc/64s: Fix unrecoverable MCE calling async handler from NMI 2021-10-07 19:54:55 +11:00
ucall.S
udbg.c isystem: ship and use stdarg.h 2021-08-19 09:02:55 +09:00
udbg_16550.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
uprobes.c powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
vdso.c powerpc/vdso: Add support for time namespaces 2021-04-14 23:04:44 +10:00
vdso32_wrapper.S
vdso64_wrapper.S
vecemu.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
vector.S powerpc/64s/interrupt: handle MSR EE and RI in interrupt entry wrapper 2021-12-16 21:31:45 +11:00
vmlinux.lds.S powerpc/toc: Future proof kernel toc 2021-12-23 22:35:01 +11:00
watchdog.c powerpc/watchdog: help remote CPUs to flush NMI printk output 2021-11-29 23:08:43 +11:00