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6f5b9f018f
linux/arch/powerpc/kernel
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Breno Leitao 6f5b9f018f powerpc/tm: Unset MSR[TS] if not recheckpointing 
There is a TM Bad Thing bug that can be caused when you return from a
signal context in a suspended transaction but with ucontext MSR[TS] unset.

This forces regs->msr[TS] to be set at syscall entrance (since the CPU
state is transactional). It also calls treclaim() to flush the transaction
state, which is done based on the live (mfmsr) MSR state.

Since user context MSR[TS] is not set, then restore_tm_sigcontexts() is not
called, thus, not executing recheckpoint, keeping the CPU state as not
transactional. When calling rfid, SRR1 will have MSR[TS] set, but the CPU
state is non transactional, causing the TM Bad Thing with the following
stack:

	[   33.862316] Bad kernel stack pointer 3fffd9dce3e0 at c00000000000c47c
	cpu 0x8: Vector: 700 (Program Check) at [c00000003ff7fd40]
	    pc: c00000000000c47c: fast_exception_return+0xac/0xb4
	    lr: 00003fff865f442c
	    sp: 3fffd9dce3e0
	   msr: 8000000102a03031
	  current = 0xc00000041f68b700
	  paca    = 0xc00000000fb84800   softe: 0        irq_happened: 0x01
	    pid   = 1721, comm = tm-signal-sigre
	Linux version 4.9.0-3-powerpc64le (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18) ) #1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26)
	WARNING: exception is not recoverable, can't continue

The same problem happens on 32-bits signal handler, and the fix is very
similar, if tm_recheckpoint() is not executed, then regs->msr[TS] should be
zeroed.

This patch also fixes a sparse warning related to lack of indentation when
CONFIG_PPC_TRANSACTIONAL_MEM is set.

Fixes: 2b0a576d15 ("powerpc: Add new transactional memory state to the signal context")
CC: Stable <stable@vger.kernel.org>	# 3.10+
Signed-off-by: Breno Leitao <leitao@debian.org>
Tested-by: Michal Suchánek <msuchanek@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-12-21 14:46:50 +11:00
..
trace powerpc64/ftrace: Drop pointless static qualifier in is_b_op() 2018-11-25 17:11:22 +11:00
vdso32 powerpc/vdso: Correct call frame information 2018-09-14 13:47:31 +10:00
vdso64 powerpc/vdso: Correct call frame information 2018-09-14 13:47:31 +10:00
.gitignore
align.c powerpc/sstep: Introduce GETTYPE macro 2018-06-03 21:19:40 +10:00
asm-offsets.c powerpc updates for 4.20 2018-10-26 14:36:21 -07:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
btext.c powerpc: Rework btext_find_display to use of_stdout and device_type helpers 2018-11-26 22:33:37 +11:00
cacheinfo.c powerpc: Use device_type helpers to access the node type 2018-11-26 22:33:37 +11:00
cacheinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu_setup_6xx.S powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
cpu_setup_44x.S
cpu_setup_fsl_booke.S powerpc/mm: move platform specific mmu-xxx.h in platform directories 2018-12-04 19:45:01 +11:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode 2018-10-09 16:04:27 +11:00
cpu_setup_ppc970.S
cputable.c Merge branch 'topic/ppc-kvm' into next 2018-07-19 14:37:57 +10:00
crash_dump.c powerpc: don't use ioremap_prot() nor __ioremap() unless really needed. 2018-10-14 18:04:09 +11:00
crash.c powerpc: remove kdump.h from page.h 2018-07-30 22:47:53 +10:00
dbell.c powerpc: Introduce msgsnd/doorbell barrier primitives 2017-04-13 23:34:33 +10:00
dma-iommu.c powerpc/dma: remove the unused dma_iommu_ops export 2018-12-20 22:21:20 +11:00
dma-swiotlb.c powerpc: use mm zones more sensibly 2018-12-20 22:21:20 +11:00
dma.c powerpc: use mm zones more sensibly 2018-12-20 22:21:20 +11:00
dt_cpu_ftrs.c memblock: rename memblock_alloc{_nid,_try_nid} to memblock_phys_alloc* 2018-10-31 08:54:15 -07:00
eeh_cache.c powerpc/eeh: Fix misleading comment in __eeh_addr_cache_get_device() 2018-03-27 23:44:58 +11:00
eeh_dev.c powerpc/eeh: Cleanup list_head field names 2018-10-13 22:21:25 +11:00
eeh_driver.c powerpc/eeh: Declare pci_ers_result_name() as static 2018-11-25 17:11:21 +11:00
eeh_event.c powerpc: eeh_event: convert semaphore to completion 2018-12-20 22:21:20 +11:00
eeh_pe.c powerpc/eeh: Cleanup eeh_ops.wait_state() 2018-10-13 22:21:25 +11:00
eeh_sysfs.c powerpc/eeh: Add EEH notify resume sysfs 2018-01-27 20:02:52 +11:00
eeh.c powerpc/eeh: Fix debugfs_simple_attr.cocci warnings 2018-12-20 22:59:03 +11:00
entry_32.S powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
entry_64.S powerpc/tm: Save MSR to PACA before RFID 2018-12-21 14:46:50 +11:00
epapr_hcalls.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
epapr_paravirt.c
exceptions-64e.S powerpc/fsl: Flush the branch predictor at each kernel entry (64bit) 2018-12-20 22:59:03 +11:00
exceptions-64s.S powerpc/64s/hash: Convert SLB miss handlers to C 2018-10-14 18:04:09 +11:00
fadump.c powerpc/fadump: Do not allow hot-remove memory from fadump reserved area. 2018-12-21 11:32:49 +11:00
firmware.c
fpu.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
fsl_booke_entry_mapping.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head_8xx.S powerpc/8xx: add exception frame marker 2018-12-19 18:56:32 +11:00
head_32.S powerpc/mm: add exec protection on powerpc 603 2018-12-19 18:56:32 +11:00
head_40x.S powerpc/405: move PPC405_ERR77 in asm-405.h 2018-07-30 22:48:13 +10:00
head_44x.S powerpc/44x: use patch_sites for TLB handlers patching 2018-12-19 18:56:32 +11:00
head_64.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
head_booke.h powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) 2018-12-20 22:59:03 +11:00
head_fsl_booke.S powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) 2018-12-20 22:59:03 +11:00
hw_breakpoint.c perf/arch/powerpc: Implement hw_breakpoint_arch_parse() 2018-06-26 09:07:55 +02:00
idle_6xx.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
idle_book3e.S powerpc/64s: make PACA_IRQ_HARD_DIS track MSR[EE] closely 2018-07-24 22:03:14 +10:00
idle_book3s.S Merge branch 'fixes' into next 2018-08-13 15:59:06 +10:00
idle_e500.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
idle_power4.S powerpc/64s: Fix PACA_IRQ_HARD_DIS accounting in idle_power4() 2018-08-14 15:36:02 +10:00
idle.c
ima_kexec.c powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
io-workarounds.c powerpc: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
io.c
iomap.c powerpc: iomap.c: introduce io{read|write}64_{lo_hi|hi_lo} 2018-04-05 14:59:26 +10:00
iommu.c powerpc updates for 4.20 2018-10-26 14:36:21 -07:00
irq.c powerpc/64: Disable irq restore warning for now 2018-08-07 21:49:24 +10:00
isa-bridge.c powerpc: Use device_type helpers to access the node type 2018-11-26 22:33:37 +11:00
jump_label.c
kexec_elf_64.c kernel/kexec_file.c: allow archs to set purgatory load address 2018-04-13 17:10:28 -07:00
kgdb.c powerpc/kgdb: add kgdb_arch_set/remove_breakpoint() 2018-10-20 13:26:47 +11:00
kprobes-ftrace.c bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe 2018-06-21 12:33:19 +02:00
kprobes.c bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe 2018-06-21 12:33:19 +02:00
kvm_emul.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
kvm.c powerpc/kvm: Prefer fault_in_pages_readable function 2018-05-17 14:12:40 +10:00
l2cr_6xx.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
legacy_serial.c Merge branch 'fixes' into next 2018-12-17 22:11:54 +11:00
machine_kexec_32.c
machine_kexec_64.c powerpc/64/kexec: fix race in kexec when XIVE is shutdown 2018-05-10 23:25:08 +10:00
machine_kexec_file_64.c powerpc/kexec: Use common error handling code in setup_new_fdt() 2018-08-10 22:12:36 +10:00
machine_kexec.c powerpc: remove kdump.h from page.h 2018-07-30 22:47:53 +10:00
Makefile powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
mce_power.c powerpc/64s/hash: Do not use PPC_INVALIDATE_ERAT on CPUs before POWER9 2018-10-04 23:16:53 +10:00
mce.c powerpc/pseries: Flush SLB contents on SLB MCE errors. 2018-09-19 21:59:22 +10:00
misc_32.S powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
misc_64.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
misc.S powerpc/misc: merge reloc_offset() and add_reloc_offset() 2018-06-04 00:39:17 +10:00
module_32.c powerpc/sparse: Fix plain integer as NULL pointer warning 2018-05-25 12:04:38 +10:00
module_64.c powerpc/64/module: REL32 relocation range check 2018-10-20 13:26:47 +11:00
module.c powerpc64/module elfv1: Set opd addresses after module relocation 2018-10-20 13:26:47 +11:00
module.lds powerpc/modules: Fix alignment of .toc section in kernel modules 2017-12-11 13:03:35 +11:00
msi.c powerpc/msi: Fix NULL pointer access in teardown code 2018-11-29 23:49:11 +11:00
nvram_64.c powerpc: annotate implicit fall throughs 2018-12-04 19:45:01 +11:00
of_platform.c powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
optprobes_head.S powerpc/64: Rename soft_enabled to irq_soft_mask 2018-01-19 22:37:01 +11:00
optprobes.c powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace 2017-11-12 23:51:41 +11:00
paca.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
pci_32.c memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
pci_64.c powerpc: handover page flags with a pgprot_t parameter 2018-10-14 18:04:09 +11:00
pci_dn.c powerpc/pci: Separate SR-IOV Calls 2017-12-11 13:03:35 +11:00
pci_of_scan.c powerpc: Use device_type helpers to access the node type 2018-11-26 22:33:37 +11:00
pci-common.c powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
pci-hotplug.c powerpc/pci: Unroll two pass loop when scanning bridges 2017-12-18 23:05:52 -06:00
pmc.c powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
ppc32.h
ppc_save_regs.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
proc_powerpc.c powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
process.c powerpc fixes for 4.20 #2 2018-11-02 09:19:35 -07:00
prom_init_check.sh powerpc: Check prom_init for disallowed sections 2018-10-19 00:56:17 +11:00
prom_init.c powerpc/prom_init: Generate "phandle" instead of "linux, phandle" 2018-10-19 00:56:17 +11:00
prom_parse.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
prom.c powerpc/prom: move the device tree if not in declared memory. 2018-12-20 22:21:20 +11:00
ptrace32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ptrace.c powerpc/ptrace: Combine SYSCALL_EMU & SYSCALL_TRACE handling 2018-12-20 22:21:20 +11:00
reloc_32.S
reloc_64.S powerpc/asm: Convert .llong directives to .8byte 2017-08-31 14:26:47 +10:00
rtas_flash.c powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
rtas_pci.c powerpc/kernel: Change retrieval of pci_dn 2017-08-31 14:26:40 +10:00
rtas-proc.c powerpc updates for 4.18 2018-06-07 10:23:33 -07:00
rtas-rtc.c powerpc: use time64_t in read_persistent_clock 2018-06-03 20:43:33 +10:00
rtas.c powerpc/rtas: Fix a potential race between CPU-Offline & Migration 2018-10-13 22:21:25 +11:00
rtasd.c powerpc/pseries: PAPR persistent memory support 2018-10-19 00:56:17 +11:00
security.c powerpc/fsl: Update Spectre v2 reporting 2018-12-20 22:59:03 +11:00
setup_32.c powerpc/dma: remove the unused ISA_DMA_THRESHOLD export 2018-12-20 22:21:20 +11:00
setup_64.c powerpc/64: Fix kernel stack 16-byte alignment 2018-11-15 14:48:43 +11:00
setup-common.c powerpc/fsl: Enable runtime patching if nospectre_v2 boot arg is used 2018-12-20 22:59:03 +11:00
setup.h powerpc/tau: Synchronize function prototypes and body 2018-05-25 12:04:43 +10:00
signal_32.c powerpc/tm: Unset MSR[TS] if not recheckpointing 2018-12-21 14:46:50 +11:00
signal_64.c powerpc/tm: Unset MSR[TS] if not recheckpointing 2018-12-21 14:46:50 +11:00
signal.c rseq: Avoid infinite recursion when delivering SIGSEGV 2018-06-22 19:04:22 +02:00
signal.h powerpc/syscalls: signal_{32, 64} - switch to SYSCALL_DEFINE 2018-05-10 23:25:13 +10:00
smp-tbsync.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.c powerpc: Fix stack protector crashes on CPU hotplug 2018-10-21 19:32:00 +11:00
stacktrace.c powerpc/64s: Fix build failures with CONFIG_NMI_IPI=n 2018-06-19 23:03:50 +10:00
suspend.c
swsusp_32.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
swsusp_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h> 2017-03-02 08:42:30 +01:00
swsusp_asm64.S powerpc/64s/hash: Simplify slb_flush_and_rebolt() 2018-10-14 18:04:09 +11:00
swsusp_booke.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swsusp.c powerpc/swsusp: Include suspend.h to silence sparse warnings 2017-03-20 19:02:49 +11:00
sys_ppc32.c powerpc/syscalls: kill ppc32_select() 2018-05-10 23:25:15 +10:00
syscalls.c powerpc: Remove -Wattribute-alias pragmas 2018-06-25 23:21:13 +09:00
sysfs.c powerpc: change CONFIG_6xx to CONFIG_PPC_BOOK3S_32 2018-11-26 22:33:37 +11:00
systbl_chk.c powerpc/syscalls: Add COMPAT_SPU_NEW() macro 2018-05-10 23:25:14 +10:00
systbl_chk.sh powerpc: Make it clearer that systbl check errors are errors 2018-05-10 23:25:16 +10:00
systbl.S powerpc/syscalls: Add COMPAT_SPU_NEW() macro 2018-05-10 23:25:14 +10:00
tau_6xx.c powerpc/tau: Make some function static 2018-05-25 12:04:44 +10:00
time.c powerpc/time: no steal_time when CONFIG_PPC_SPLPAR is not selected 2018-10-20 13:26:47 +11:00
tm.S Merge branch 'fixes' into next 2018-10-09 16:51:05 +11:00
traps.c powerpc/tm: Print scratch value 2018-12-21 14:46:50 +11:00
udbg_16550.c
udbg.c
uprobes.c powerpc/uprobes: Implement arch_uretprobe_is_alive() 2017-08-24 16:19:21 +10:00
vdso.c powerpc: remove unneeded inclusions of cpu_has_feature.h 2018-07-30 22:47:54 +10:00
vecemu.c powerpc: Add a missing include header 2018-05-25 12:04:46 +10:00
vector.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
vmlinux.lds.S powerpc/fsl: Add infrastructure to fixup branch predictor flush 2018-12-20 22:53:39 +11:00
watchdog.c powerpc: NMI IPI make NMI IPIs fully sychronous 2018-07-24 22:03:14 +10:00