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linux/arch/powerpc/kernel
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Hari Bathini cb5b691f82 powerpc64/ftrace: fix clobbered r15 during livepatching 
While r15 is clobbered always with PPC_FTRACE_OUT_OF_LINE, it is
not restored in livepatch sequence leading to not so obvious fails
like below:

  BUG: Unable to handle kernel data access on write at 0xc0000000000f9078
  Faulting instruction address: 0xc0000000018ff958
  Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP:  c0000000018ff958 LR: c0000000018ff930 CTR: c0000000009c0790
  REGS: c00000005f2e7790 TRAP: 0300   Tainted: G              K      (6.14.0+)
  MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 2822880b  XER: 20040000
  CFAR: c0000000008addc0 DAR: c0000000000f9078 DSISR: 0a000000 IRQMASK: 1
  GPR00: c0000000018f2584 c00000005f2e7a30 c00000000280a900 c000000017ffa488
  GPR04: 0000000000000008 0000000000000000 c0000000018f24fc 000000000000000d
  GPR08: fffffffffffe0000 000000000000000d 0000000000000000 0000000000008000
  GPR12: c0000000009c0790 c000000017ffa480 c00000005f2e7c78 c0000000000f9070
  GPR16: c00000005f2e7c90 0000000000000000 0000000000000000 0000000000000000
  GPR20: 0000000000000000 c00000005f3efa80 c00000005f2e7c60 c00000005f2e7c88
  GPR24: c00000005f2e7c60 0000000000000001 c0000000000f9078 0000000000000000
  GPR28: 00007fff97960000 c000000017ffa480 0000000000000000 c0000000000f9078
  ...
  Call Trace:
    check_heap_object+0x34/0x390 (unreliable)
  __mutex_unlock_slowpath.isra.0+0xe4/0x230
  seq_read_iter+0x430/0xa90
  proc_reg_read_iter+0xa4/0x200
  vfs_read+0x41c/0x510
  ksys_read+0xa4/0x190
  system_call_exception+0x1d0/0x440
  system_call_vectored_common+0x15c/0x2ec

Fix it by restoring r15 always.

Fixes: eec37961a5 ("powerpc64/ftrace: Move ftrace sequence out of line")
Reported-by: Viktor Malik <vmalik@redhat.com>
Closes: https://lore.kernel.org/lkml/1aec4a9a-a30b-43fd-b303-7a351caeccb7@redhat.com
Cc: stable@vger.kernel.org # v6.13+
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Viktor Malik <vmalik@redhat.com>
Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416191227.201146-1-hbathini@linux.ibm.com
2025-04-29 11:03:07 +05:30
..
ptrace
seccomp: remove the 'sd' argument from __secure_computing()
2025-02-10 09:26:22 -08:00
syscalls
fs: add open_tree_attr()
2025-02-12 12:12:28 +01:00
trace
powerpc64/ftrace: fix clobbered r15 during livepatching
2025-04-29 11:03:07 +05:30
vdso
powerpc/vdso: Switch to generic storage implementation
2025-02-21 09:54:02 +01:00
.gitignore
…
85xx_entry_mapping.S
…
align.c
…
asm-offsets.c
powerpc/vdso: Switch to generic storage implementation
2025-02-21 09:54:02 +01:00
audit_32.h
powerpc: address missing-prototypes warnings
2023-08-02 22:22:19 +10:00
audit.c
powerpc: address missing-prototypes warnings
2023-08-02 22:22:19 +10:00
btext.c
powerpc: Use shared font data
2023-10-01 23:09:02 +11:00
cacheinfo.c
powerpc: Constify struct kobj_type
2024-09-05 22:25:36 +10:00
cacheinfo.h
…
compat_audit.c
powerpc: address missing-prototypes warnings
2023-08-02 22:22:19 +10:00
cpu_setup_6xx.S
powerpc: rename SPRN_HID2 define to SPRN_HID2_750FX
2024-05-08 00:25:00 +10:00
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/dexcr: Add initial Dynamic Execution Control Register (DEXCR) support
2023-06-19 17:36:25 +10:00
cpu_setup_ppc970.S
…
cpu_specs_8xx.h
…
cpu_specs_44x.h
…
cpu_specs_47x.h
…
cpu_specs_85xx.h
…
cpu_specs_book3s_32.h
…
cpu_specs_book3s_64.h
powerpc: Add Power11 architected and raw mode
2024-02-21 23:11:00 +11:00
cpu_specs_e500mc.h
powerpc/cputable: Add missing PPC_FEATURE_BOOKE on PPC64 Book-E
2024-02-14 14:24:06 +11:00
cpu_specs.h
powerpc: Remove core support for 40x
2024-06-28 22:28:47 +10:00
cputable.c
powerpc: Make cpu_spec __ro_after_init
2023-11-27 22:01:14 +11:00
crash_dump.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
dawr.c
…
dbell.c
powerpc/64: Fix perf profiling asynchronous interrupt handlers
2023-01-30 20:07:42 +11:00
dexcr.c
powerpc/dexcr: Add DEXCR prctl interface
2024-05-06 22:04:31 +10:00
dma-iommu.c
powerpc: Remove some Cell leftovers
2025-02-26 21:15:07 +05:30
dma-mask.c
dma-mapping: move arch_dma_set_mask() declaration to header
2023-07-31 17:54:28 +02:00
dma-swiotlb.c
…
dt_cpu_ftrs.c
mm/memblock: add memblock_alloc_or_panic interface
2025-01-25 20:22:38 -08:00
early_32.c
…
eeh_cache.c
…
eeh_driver.c
powerpc/eeh: Permanently disable the removed device
2024-04-29 23:51:15 +10:00
eeh_event.c
…
eeh_pe.c
powerpc/eeh: avoid possible crash when edev->pdev changes
2024-06-23 11:54:27 +10:00
eeh_sysfs.c
…
eeh.c
powerpc/pseries/eeh: move pseries_eeh_err_inject() outside CONFIG_DEBUG_FS block
2024-09-20 19:06:25 +10:00
entry_32.S
powerpc: Replace CONFIG_4xx with CONFIG_44x
2024-06-28 22:28:48 +10:00
epapr_hcalls.S
powerpc/4xx: Remove CONFIG_BOOKE_OR_40x
2024-06-28 22:28:48 +10:00
epapr_paravirt.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
exceptions-64e.S
powerpc/64e: drop unused TLB miss handlers
2024-07-12 15:52:15 -07:00
exceptions-64s.S
powerpc/cell: Remove support for IBM Cell Blades
2025-02-26 21:15:07 +05:30
fadump.c
fadump: Use str_yes_no() helper in fadump_show_config()
2025-04-16 22:25:22 +05:30
firmware.c
powerpc: Export kvm_guest static key, for bcachefs six locks
2024-01-01 11:47:38 -05:00
fpu.S
powerpc: Don't clobber f0/vs0 during fp|altivec register save
2023-11-28 23:04:43 +11:00
head_8xx.S
powerpc/8xx: Fix kernel DTLB miss on dcbz
2024-10-11 15:53:06 +11:00
head_32.h
powerpc: Remove core support for 40x
2024-06-28 22:28:47 +10:00
head_44x.S
powerpc/44x: Introduce _PAGE_READ and remove _PAGE_USER
2023-10-19 17:12:46 +11:00
head_64.S
powerpc/64s: Fix unnecessary copy to 0 when kernel is booted at address 0
2024-06-23 11:54:13 +10:00
head_85xx.S
powerpc/e500: use contiguous PMD instead of hugepd
2024-07-12 15:52:18 -07:00
head_book3s_32.S
powerpc/603: Inconditionally use task PGDIR in DTLB misses
2024-08-30 21:29:55 +10:00
head_booke.h
powerpc: Remove core support for 40x
2024-06-28 22:28:47 +10:00
hw_breakpoint_constraints.c
powerpc/watchpoint: Disable pagefaults when getting user instruction
2023-09-18 12:23:47 +10:00
hw_breakpoint.c
powerpc/watchpoints: Annotate atomic context in more places
2023-09-18 12:23:47 +10:00
idle_6xx.S
…
idle_64e.S
…
idle_85xx.S
…
idle_book3s.S
…
idle.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
ima_arch.c
integrity: Always reference the blacklist keyring with appraisal
2023-08-01 08:17:25 -04:00
interrupt_64.S
powerpc/64: Set task pt_regs->link to the LR value on scv entry
2024-02-05 22:43:19 +11:00
interrupt.c
powerpc: enable dynamic preemption
2025-04-16 22:30:22 +05:30
io.c
powerpc/io: Use standard barrier macros in io.c
2025-02-26 21:15:09 +05:30
iomap.c
…
iommu.c
powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
2025-01-11 10:39:10 +05:30
irq_64.c
work around gcc bugs with 'asm goto' with outputs
2024-02-09 15:57:48 -08:00
irq.c
powerpc/irq: use seq_put_decimal_ull_width() for decimal values
2024-11-10 22:33:52 +11:00
isa-bridge.c
mm: Introduce vmap_page_range() to map pages in PCI address space
2024-03-11 16:58:10 +01:00
jump_label.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
kdebugfs.c
…
kgdb.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
kprobes-ftrace.c
kprobe/ftrace: bail out if ftrace was killed
2024-05-16 07:23:30 +09:00
kprobes.c
Merge tag 'powerpc-6.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2024-11-23 10:44:31 -08:00
kvm_emul.S
…
kvm.c
…
l2cr_6xx.S
…
legacy_serial.c
powerpc: Explicitly include correct DT includes
2023-08-02 22:22:19 +10:00
Makefile
powerpc/io: Remove PPC_IO_WORKAROUNDS
2025-02-26 21:15:08 +05:30
mce_power.c
…
mce.c
powerpc/mce: log the error for all unrecoverable errors
2023-02-10 22:17:34 +11:00
misc_32.S
powerpc/32: Replace mulhdu() by mul_u64_u64_shr()
2024-12-10 08:15:30 +05:30
misc_64.S
powerpc/64: Remove maple platform
2024-10-29 23:01:52 +11:00
misc.S
powerpc: replace #include <asm/export.h> with #include <linux/export.h>
2023-08-16 23:54:48 +10:00
module_32.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
module_64.c
modules: Support extended MODVERSIONS info
2025-01-11 01:25:26 +09:00
module.c
Merge tag 'powerpc-6.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2024-05-17 09:05:46 -07:00
msi.c
…
note.S
…
nvram_64.c
printk: Add a short description string to kmsg_dump()
2024-07-17 12:35:24 +02:00
optprobes_head.S
powerpc: add definition for pt_regs offset within an interrupt frame
2022-12-02 17:54:08 +11:00
optprobes.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
paca.c
docs: move powerpc under arch
2023-10-10 13:35:55 -06:00
pci_32.c
mm/memblock: add memblock_alloc_or_panic interface
2025-01-25 20:22:38 -08:00
pci_64.c
powerpc/pci_64: Init pcibios subsys a bit later
2023-03-14 23:36:27 +11:00
pci_dn.c
…
pci_of_scan.c
…
pci-common.c
arch: Rename fbdev header and source files
2024-05-03 17:07:50 +02:00
pci-hotplug.c
powerpc/pci: Hotplug driver bridge support
2024-07-04 23:10:40 +10:00
pmc.c
powerpc/85xx: Mark some functions static and add missing includes to fix no previous prototype error
2023-08-23 15:55:21 +10:00
ppc_save_regs.S
powerpc: update ppc_save_regs to save current r1 in pt_regs
2023-06-19 17:37:14 +10:00
proc_powerpc.c
powerpc: Split systemcfg struct definitions out from vdso
2024-11-02 12:37:36 +01:00
process.c
powerpc/64: Use get_user() in start_thread()
2024-12-18 13:41:57 +05:30
prom_entry_64.S
powerpc/64: Rename entry_64.S to prom_entry_64.S
2023-06-15 14:04:19 +10:00
prom_init_check.sh
kasan, powerpc: don't rename memintrinsics if compiler adds prefixes
2023-03-23 17:18:33 -07:00
prom_init.c
powerpc/prom_init: Fixup missing #size-cells on PowerBook6,7
2025-03-07 19:08:38 +05:30
prom_parse.c
…
prom.c
powerpc/crash: use generic crashkernel reservation
2025-03-16 22:30:48 -07:00
reloc_32.S
…
reloc_64.S
…
rethook.c
powerpc: Replace kretprobe code with rethook on powerpc
2024-09-05 22:25:36 +10:00
rtas_entry.S
…
rtas_flash.c
powerpc: add missing MODULE_DESCRIPTION() macros
2024-07-04 22:39:20 +10:00
rtas_pci.c
powerpc/rtas_pci: rename and properly expose config access APIs
2023-11-28 21:49:45 +11:00
rtas-proc.c
powerpc/rtas: Fix ppc_rtas_rmo_buf_show() kernel-doc
2023-11-07 13:13:45 +11:00
rtas-rtc.c
powerpc/rtas: arch-wide function token lookup conversions
2023-02-13 22:35:03 +11:00
rtas.c
powerpc/pseries: Add a char driver for physical-attestation RTAS
2025-04-17 11:42:30 +05:30
rtasd.c
powerpc/rtas: arch-wide function token lookup conversions
2023-02-13 22:35:03 +11:00
secure_boot.c
powerpc: Use str_enabled_disabled() helper function
2024-11-05 20:48:20 +11:00
security.c
asm-generic: introduce text-patching.h
2024-11-07 14:25:15 -08:00
secvar-ops.c
powerpc/secvar: Warn and error if multiple secvar ops are set
2023-02-12 22:12:36 +11:00
secvar-sysfs.c
powerpc/secvar: Constify 'struct bin_attribute'
2025-02-21 09:20:32 +01:00
setup_32.c
mm/memblock: add memblock_alloc_or_panic interface
2025-01-25 20:22:38 -08:00
setup_64.c
powerpc/io: Remove PPC_INDIRECT_MMIO
2025-02-26 21:15:08 +05:30
setup-common.c
arch, mm: set max_mapnr when allocating memory map for FLATMEM
2025-03-17 22:06:52 -07:00
setup.h
powerpc/4xx: Remove CONFIG_BOOKE_OR_40x
2024-06-28 22:28:48 +10:00
signal_32.c
powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe()
2023-06-09 23:29:51 +10:00
signal_64.c
…
signal.c
powerpc: Replace GPL 2.0+ README.legal boilerplate with SPDX
2023-09-19 20:05:58 +10:00
signal.h
powerpc: Replace GPL 2.0+ README.legal boilerplate with SPDX
2023-09-19 20:05:58 +10:00
smp-tbsync.c
…
smp.c
powerpc: Split systemcfg struct definitions out from vdso
2024-11-02 12:37:36 +01:00
stacktrace.c
powerpc: Replace kretprobe code with rethook on powerpc
2024-09-05 22:25:36 +10:00
static_call.c
powerpc/static_call: Implement inline static calls
2025-02-26 21:09:43 +05:30
suspend.c
…
switch.S
powerpc: Fix 'intra_function_call not a direct call' warning
2025-03-10 10:00:17 +05:30
swsusp_32.S
powerpc/32: Fix objtool unannotated intra-function call warnings
2022-11-18 19:00:06 +11:00
swsusp_64.c
powerpc/suspend: Add prototype for do_after_copyback()
2023-11-30 13:15:49 +11:00
swsusp_85xx.S
…
swsusp_asm64.S
…
swsusp.c
…
sys_ppc32.c
powerpc/32: fix syscall wrappers with 64-bit arguments
2022-11-01 10:24:09 +11:00
syscall.c
treewide: context_tracking: Rename CONTEXT_* into CT_STATE_*
2024-07-29 07:33:10 +05:30
syscalls.c
…
sysfs.c
powerpc/machdep: Drop include of dma-mapping.h
2024-10-29 23:01:05 +11:00
systbl.c
…
tau_6xx.c
powerpc, workqueue: Use alloc_ordered_workqueue() to create ordered workqueues
2023-05-08 13:52:27 -10:00
time.c
Merge tag 'powerpc-6.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2025-03-27 19:39:08 -07:00
tm.S
powerpc: replace #include <asm/export.h> with #include <linux/export.h>
2023-08-16 23:54:48 +10:00
traps.c
powerpc: Rely on generic printing of preemption model
2025-03-17 11:23:39 +01:00
ucall.S
powerpc: replace #include <asm/export.h> with #include <linux/export.h>
2023-08-16 23:54:48 +10:00
udbg_16550.c
powerpc/64: Remove maple platform
2024-10-29 23:01:52 +11:00
udbg.c
powerpc: Remove UDBG_RTAS_CONSOLE
2025-02-26 21:15:09 +05:30
uprobes.c
…
vdso32_wrapper.S
powerpc/vdso: Mark the vDSO code read-only after init
2024-12-18 13:46:38 +05:30
vdso64_wrapper.S
powerpc/vdso: Mark the vDSO code read-only after init
2024-12-18 13:46:38 +05:30
vdso.c
powerpc/vdso: Switch to generic storage implementation
2025-02-21 09:54:02 +01:00
vecemu.c
…
vector.S
powerpc: Don't clobber f0/vs0 during fp|altivec register save
2023-11-28 23:04:43 +11:00
vmlinux.lds.S
powerpc/vmlinux: Remove etext, edata and end
2025-02-24 12:26:21 +05:30
watchdog.c
powerpc/watchdog: Switch to use hrtimer_setup()
2025-02-18 10:32:31 +01:00