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linux-stable/arch/powerpc/kernel
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Nicholas Piggin 2ea31e2e62 powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch 
The RFI and STF security mitigation options can flip the
interrupt_exit_not_reentrant static branch condition concurrently with
the interrupt exit code which tests that branch.

Interrupt exit tests this condition to set MSR[EE|RI] for exit, then
again in the case a soft-masked interrupt is found pending, to recover
the MSR so the interrupt can be replayed before attempting to exit
again. If the condition changes between these two tests, the MSR and irq
soft-mask state will become corrupted, leading to warnings and possible
crashes. For example, if the branch is initially true then false,
MSR[EE] will be 0 but PACA_IRQ_HARD_DIS clear and EE may not get
enabled, leading to warnings in irq_64.c.

Fixes: 13799748b9 ("powerpc/64: use interrupt restart table to speed up return from interrupt")
Cc: stable@vger.kernel.org # v5.14+
Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230206042240.92103-1-npiggin@gmail.com
2023-02-07 10:13:33 +11:00
..
ptrace powerpc: ptrace: user_regset_copyin_ignore() always returns 0 2022-11-15 14:30:40 -08:00
syscalls powerpc/32: fix syscall wrappers with 64-bit arguments 2022-11-01 10:24:09 +11:00
trace powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
vdso powerpc/vdso: Skip objtool from running on VDSO files 2022-11-18 19:00:06 +11:00
.gitignore
85xx_entry_mapping.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
align.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
asm-offsets.c powerpc: add a define for the switch frame size and regs offset 2022-12-02 17:54:08 +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: Fix all occurences of duplicate words 2022-07-25 12:05:15 +10:00
cacheinfo.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
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 powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_44x.S
cpu_setup_e500.S powerpc/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
cpu_setup_pa6t.S
cpu_setup_power.c powerpc/cputable: Move __cpu_setup() prototypes out of cputable.h 2022-09-26 22:26:49 +10:00
cpu_setup_ppc970.S
cpu_specs.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_8xx.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_40x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_44x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_47x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_85xx.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_book3s_32.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_book3s_64.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_e500mc.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cputable.c powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
crash_dump.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
dawr.c powerpc: Include asm/firmware.h in all users of firmware_has_feature() 2022-06-29 16:45:05 +10:00
dbell.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-01-30 20:07:42 +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 swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction 2022-04-18 07:21:12 +02:00
dt_cpu_ftrs.c powerpc: move from strlcpy with unused retval to strscpy 2022-08-26 11:02:20 +10:00
early_32.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
eeh.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_cache.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
eeh_driver.c powerpc: Fix all occurences of duplicate words 2022-07-25 12:05:15 +10:00
eeh_event.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_pe.c powerpc: Fix all occurences of "the the" 2022-05-22 15:59:43 +10:00
eeh_sysfs.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
entry_32.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
entry_64.S powerpc: Curb objtool unannotated intra-function call warnings 2022-11-15 20:11:47 +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/64e: Clear gprs on interrupt routine entry on Book3E 2022-12-02 20:46:08 +11:00
exceptions-64s.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
fadump.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
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
head_8xx.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_32.h powerpc: add a definition for the marker offset within the interrupt frame 2022-12-02 17:54:08 +11:00
head_40x.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_44x.S powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
head_64.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_85xx.S powerpc/85xx: Fix unannotated intra-function call warning 2023-01-30 15:59:59 +11:00
head_book3s_32.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
head_booke.h powerpc: add a definition for the marker offset within the interrupt frame 2022-12-02 17:54:08 +11:00
hw_breakpoint.c powerpc/8xx: Fix warning in hw_breakpoint_handler() 2022-11-24 23:31:49 +11:00
hw_breakpoint_constraints.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
idle.c powerpc/idle: Fix return value of __setup() handler 2022-05-04 19:37:46 +10:00
idle_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
idle_64e.S powerpc: add ISA v3.0 / v3.1 wait opcode macro 2022-09-28 19:22:10 +10:00
idle_85xx.S powerpc: Cleanup idle for e500 2022-09-26 23:00:14 +10:00
idle_book3s.S powerpc/idle: Don't corrupt back chain when going idle 2021-10-20 21:37:58 +11:00
ima_arch.c
interrupt.c powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch 2023-02-07 10:13:33 +11:00
interrupt_64.S powerpc/64s: Zeroise gprs on interrupt routine entry on Book3S 2022-12-02 20:46:05 +11:00
io-workarounds.c
io.c
iomap.c
iommu.c powerpc/iommu: Fix iommu_table_in_use for a small default DMA window case 2022-07-28 16:22:13 +10:00
irq.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-01-30 20:07:42 +11:00
irq_64.c powerpc/64/irq: tidy soft-masked irq replay and improve documentation 2022-09-28 19:22:11 +10:00
isa-bridge.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
jump_label.c
kdebugfs.c powerpc: rename powerpc_debugfs_root to arch_debugfs_dir 2021-08-13 22:04:26 +10:00
kgdb.c powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
kprobes-ftrace.c ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
kprobes.c powerpc updates for 6.2 2022-12-19 07:13:33 -06:00
kvm.c powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
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/kernel: Add missing of_node_put() in legacy_serial.c 2022-09-05 17:28:26 +10:00
Makefile powerpc/32: fix syscall wrappers with 64-bit arguments of unaligned register-pairs 2022-10-13 00:49:58 +11:00
mce.c powerpc/mce: use early_cpu_to_node() in mce_init() 2022-07-27 21:36:04 +10:00
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: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
misc_64.S Merge branch 'topic/objtool' into next 2022-12-08 23:57:47 +11:00
module.c powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
module_32.c powerpc/modules: Use PPC_LI macros instead of opencoding 2022-05-22 15:58:27 +10:00
module_64.c powerpc/64: Add module check for ELF ABI version 2022-12-02 17:54:07 +11:00
msi.c
note.S
nvram_64.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
of_platform.c
optprobes.c powerpc/kprobes: Have optimized_callback() use preempt_enable() 2022-11-24 23:31:49 +11:00
optprobes_head.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
paca.c powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
pci-common.c powerpc/pci-common: Fix refcount bug for 'phb->dn' 2022-09-05 17:30:29 +10:00
pci-hotplug.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pci_32.c powerpc/pci: Enable PCI domains in /proc when PCI bus numbers are not unique 2022-08-25 17:47:08 +10:00
pci_64.c powerpc/pci: Hide pci_device_from_OF_node() for non-powermac code 2022-07-27 21:36:03 +10:00
pci_dn.c powerpc/pci_dn: Add missing of_node_put() 2022-09-05 17:30:25 +10:00
pci_of_scan.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pmc.c
ppc_save_regs.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
proc_powerpc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
process.c powerpc updates for 6.2 2022-12-19 07:13:33 -06:00
prom.c powerpc/prom: Fix 32-bit build 2022-12-08 09:43:15 +11:00
prom_init.c powerpc/prom_init: drop PROM_BUG() 2022-09-26 20:58:18 +10:00
prom_init_check.sh powerpc/64: Remove unused prom_init_toc symbols 2022-09-26 20:58:16 +10:00
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 powerpc/64: avoid using r13 in relocate 2022-09-28 19:22:13 +10:00
rtas-proc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
rtas-rtc.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
rtas.c powerpc/rtas: mandate RTAS syscall filtering 2022-12-07 22:40:43 +11:00
rtas_entry.S powerpc/rtas: Fix RTAS MSR[HV] handling for Cell 2022-08-26 08:41:54 +10:00
rtas_flash.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
rtas_pci.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
rtasd.c powerpc/rtasd: use correct OF API for event scan rate 2022-12-07 22:20:33 +11:00
secure_boot.c
security.c powerpc: Remove CONFIG_PPC_FSL_BOOK3E 2022-09-26 23:00:13 +10:00
secvar-ops.c
secvar-sysfs.c powerpc/secvar: fix refcount leak in format_show() 2022-03-08 22:07:41 +11:00
setup-common.c random: do not include <asm/archrandom.h> from random.h 2022-12-20 03:13:45 +01:00
setup.h powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
setup_32.c powerpc: Change CONFIG_E500 to CONFIG_PPC_E500 2022-09-26 23:00:13 +10:00
setup_64.c powerpc/64s/interrupt: halt early boot interrupts if paca is not set up 2022-09-28 19:22:13 +10:00
signal.c powerpc/signal: Report minimum signal frame size to userspace via AT_MINSIGSTKSZ 2022-05-19 23:11:26 +10:00
signal.h powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
signal_32.c powerpc: Include all arch-specific syscall prototypes 2022-09-28 19:22:08 +10:00
signal_64.c powerpc/signal: Update comment for clarity 2022-07-28 16:22:14 +10:00
smp-tbsync.c
smp.c powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
stacktrace.c powerpc: allow minimum sized kernel stack frames 2022-12-02 17:54:09 +11:00
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/32: Fix objtool unannotated intra-function call warnings 2022-11-18 19:00:06 +11:00
swsusp_64.c powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
swsusp_85xx.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
swsusp_asm64.S powerpc/64: asm use consistent global variable declaration and access 2022-09-28 19:22:12 +10:00
sys_ppc32.c powerpc/32: fix syscall wrappers with 64-bit arguments 2022-11-01 10:24:09 +11:00
syscall.c powerpc: Provide syscall wrapper 2022-09-28 19:22:09 +10:00
syscalls.c powerpc: Adopt SYSCALL_DEFINE for arch-specific syscall handlers 2022-09-28 19:22:08 +10:00
sysfs.c powerpc: Remove CONFIG_PPC_FSL_BOOK3E 2022-09-26 23:00:13 +10:00
systbl.c powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
tau_6xx.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
time.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-01-30 20:07:42 +11:00
tm.S powerpc: add definition for pt_regs offset within an interrupt frame 2022-12-02 17:54:08 +11:00
traps.c powerpc/64s: early boot machine check handler 2022-09-28 19:22:13 +10:00
ucall.S
udbg.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
udbg_16550.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
uprobes.c powerpc: Reject probes on instructions that can't be single stepped 2022-05-06 00:00:20 +10:00
vdso.c vdso/timens: Refactor copy-pasted find_timens_vvar_page() helper into one copy 2022-12-01 11:35:40 +01:00
vdso32_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vdso64_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vecemu.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
vector.S powerpc: Fix objtool unannotated intra-function call warnings 2022-11-15 20:11:47 +11:00
vmlinux.lds.S powerpc/vmlinux.lds: Don't discard .comment 2023-01-06 00:25:12 +11:00
watchdog.c powerpc/watchdog: introduce a NMI watchdog's factor 2022-07-27 21:36:02 +10:00