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Vasily Gorbik f8c2602733 s390/ftrace: fix ftrace_update_ftrace_func implementation 
s390 enforces DYNAMIC_FTRACE if FUNCTION_TRACER is selected.
At the same time implementation of ftrace_caller is not compliant with
HAVE_DYNAMIC_FTRACE since it doesn't provide implementation of
ftrace_update_ftrace_func() and calls ftrace_trace_function() directly.

The subtle difference is that during ftrace code patching ftrace
replaces function tracer via ftrace_update_ftrace_func() and activates
it back afterwards. Unexpected direct calls to ftrace_trace_function()
during ftrace code patching leads to nullptr-dereferences when tracing
is activated for one of functions which are used during code patching.
Those function currently are:
copy_from_kernel_nofault()
copy_from_kernel_nofault_allowed()
preempt_count_sub() [with debug_defconfig]
preempt_count_add() [with debug_defconfig]

Corresponding KASAN report:
 BUG: KASAN: nullptr-dereference in function_trace_call+0x316/0x3b0
 Read of size 4 at addr 0000000000001e08 by task migration/0/15

 CPU: 0 PID: 15 Comm: migration/0 Tainted: G B 5.13.0-41423-g08316af3644d
 Hardware name: IBM 3906 M04 704 (LPAR)
 Stopper: multi_cpu_stop+0x0/0x3e0 <- stop_machine_cpuslocked+0x1e4/0x218
 Call Trace:
  [<0000000001f77caa>] show_stack+0x16a/0x1d0
  [<0000000001f8de42>] dump_stack+0x15a/0x1b0
  [<0000000001f81d56>] print_address_description.constprop.0+0x66/0x2e0
  [<000000000082b0ca>] kasan_report+0x152/0x1c0
  [<00000000004cfd8e>] function_trace_call+0x316/0x3b0
  [<0000000001fb7082>] ftrace_caller+0x7a/0x7e
  [<00000000006bb3e6>] copy_from_kernel_nofault_allowed+0x6/0x10
  [<00000000006bb42e>] copy_from_kernel_nofault+0x3e/0xd0
  [<000000000014605c>] ftrace_make_call+0xb4/0x1f8
  [<000000000047a1b4>] ftrace_replace_code+0x134/0x1d8
  [<000000000047a6e0>] ftrace_modify_all_code+0x120/0x1d0
  [<000000000047a7ec>] __ftrace_modify_code+0x5c/0x78
  [<000000000042395c>] multi_cpu_stop+0x224/0x3e0
  [<0000000000423212>] cpu_stopper_thread+0x33a/0x5a0
  [<0000000000243ff2>] smpboot_thread_fn+0x302/0x708
  [<00000000002329ea>] kthread+0x342/0x408
  [<00000000001066b2>] __ret_from_fork+0x92/0xf0
  [<0000000001fb57fa>] ret_from_fork+0xa/0x30

 The buggy address belongs to the page:
 page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1
 flags: 0x1ffff00000001000(reserved|node=0|zone=0|lastcpupid=0x1ffff)
 raw: 1ffff00000001000 0000040000000048 0000040000000048 0000000000000000
 raw: 0000000000000000 0000000000000000 ffffffff00000001 0000000000000000
 page dumped because: kasan: bad access detected

 Memory state around the buggy address:
  0000000000001d00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0000000000001d80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
 >0000000000001e00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
                       ^
  0000000000001e80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0000000000001f00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
 ==================================================================

To fix that introduce ftrace_func callback to be called from
ftrace_caller and update it in ftrace_update_ftrace_func().

Fixes: 4cc9bed034 ("[S390] cleanup ftrace backend functions")
Cc: stable@vger.kernel.org
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2021-07-15 12:54:58 +02:00
..
fpu
s390: convert to generic entry
2021-01-19 12:29:26 +01:00
trace
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vdso
s390/vdso: add minimal compat vdso
2021-07-08 15:37:28 +02:00
airq.h
s390/airq: use DMA memory for adapter interrupts
2019-06-15 12:25:05 +02:00
alternative-asm.h
s390: add assembler macros for CPU alternatives
2018-03-28 08:38:27 +02:00
alternative.h
s390/alternatives: add alternative_input() / alternative_io()
2021-02-09 15:57:06 +01:00
ap.h
s390/ap: get rid of register asm in ap_dqap()
2021-07-08 22:12:17 +02:00
appldata.h
s390/appldata: pass parameter list pointer to appldata_asm
2018-10-09 11:20:50 +02:00
archrandom.h
s390/crypto: add arch_get_random_long() support
2020-12-10 21:02:08 +01:00
asm-const.h
s390/kernel: unify EX_TABLE* implementations
2020-07-20 10:55:45 +02:00
asm-prototypes.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
atomic_ops.h
s390/atomic,cmpxchg: make constraints work with old compilers
2021-04-15 17:47:42 +02:00
atomic.h
locking/atomic: make ARCH_ATOMIC a Kconfig symbol
2021-05-26 13:20:49 +02:00
barrier.h
s390: add optimized array_index_mask_nospec
2018-02-05 07:51:41 +01:00
bitops.h
s390/bitops: use register pair instead of register asm
2021-06-18 16:41:21 +02:00
boot_data.h
s390/ipl: read IPL report at early boot
2019-04-26 12:34:05 +02:00
bug.h
printk: Make linux/printk.h self-contained
2020-07-27 17:46:24 +09:00
bugs.h
s390: add a few more SPDX identifiers
2017-12-05 07:51:09 +01:00
cache.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
ccwdev.h
s390/cio: remove duplicate struct ccw1 declaration
2021-04-05 11:30:57 +02:00
ccwgroup.h
s390/ccwgroup: use BUS_NOTIFY_UNBOUND_DRIVER to trigger ungrouping
2021-06-07 17:07:00 +02:00
checksum.h
s390/checksum: use register pair instead of register asm
2021-06-18 16:41:21 +02:00
chpid.h
s390/cio: rename struct channel_path_desc
2018-03-26 16:13:11 +02:00
chsc.h
s390/cio: Add new Operation Code OC3 to PNSO
2020-09-15 13:21:46 -07:00
cio.h
s390/cio: add tpi.h header file
2021-06-07 17:07:01 +02:00
clocksource.h
s390: convert to GENERIC_VDSO
2020-08-26 18:47:21 +02:00
clp.h
s390/pci: Implement ioremap_wc/prot() with MIO
2020-09-14 10:30:07 +02:00
cmb.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cmpxchg.h
s390/cmpxchg: use register pair instead of register asm
2021-06-28 11:18:28 +02:00
compat.h
compat: lift compat_s64 and compat_u64 to <asm-generic/compat.h>
2020-09-17 13:00:46 -04:00
cpacf.h
s390: mark __cpacf_query() as __always_inline
2019-10-04 16:37:33 +02:00
cpcmd.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpu_mcf.h
s390/cpumf: Allow concurrent access for CPU Measurement Counter Facility
2021-07-05 12:44:23 +02:00
cpu_mf-insn.h
s390/cpu_mf: add store cpu counter multiple instruction support
2019-02-22 09:19:52 +01:00
cpu_mf.h
s390/cpum_sf: Replace function name in debug statements
2019-11-30 10:52:46 +01:00
cpu.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpufeature.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cputime.h
s390: convert to generic entry
2021-01-19 12:29:26 +01:00
crw.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
css_chars.h
s390/cio: Add new Operation Code OC3 to PNSO
2020-09-15 13:21:46 -07:00
ctl_reg.h
s390/mcck: move register validation to C code
2021-07-05 12:44:23 +02:00
current.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug.h
s390/debug: debug feature version 3
2020-08-11 18:16:43 +02:00
delay.h
s390/delay: remove udelay_simple()
2020-12-16 14:55:49 +01:00
diag.h
s390/setup: diag 318: refactor struct
2020-06-23 09:16:48 +02:00
dis.h
s390/tools: generate header files in arch/s390/include/generated/
2018-01-23 07:36:53 +01:00
dma.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dwarf.h
s390/vdso: revise CFI annotations of vDSO functions
2017-12-13 10:51:36 +01:00
eadm.h
s390/eadm: fix CONFIG_BLOCK include dependency
2018-02-02 10:47:14 +01:00
ebcdic.h
s390: fix clang -Wpointer-sign warnigns in boot code
2019-05-03 17:17:58 +02:00
elf.h
s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART
2021-07-08 22:12:17 +02:00
entry-common.h
s390/signal: remove sigreturn on stack
2021-07-08 22:12:17 +02:00
exec.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
extable.h
s390/kernel: expand exception table logic to allow new handling options
2020-07-20 10:55:50 +02:00
extmem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
facility.h
s390/facility: get rid of register asm
2021-06-18 16:41:23 +02:00
fcx.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ftrace.h
s390/ftrace: fix ftrace_update_ftrace_func implementation
2021-07-15 12:54:58 +02:00
futex.h
s390/mm: remove set_fs / rework address space handling
2020-11-23 12:01:12 +01:00
gmap.h
s390: remove orphaned function declarations
2020-09-30 12:09:54 +02:00
hardirq.h
softirq: Move __ARCH_HAS_DO_SOFTIRQ to Kconfig
2021-02-10 23:34:16 +01:00
hugetlb.h
mm: reorder includes after introduction of linux/pgtable.h
2020-06-09 09:39:13 -07:00
hw_irq.h
s390/irq: make init_ext_interrupts static
2020-03-11 14:18:44 +01:00
idals.h
s390/idal: use struct_size() in kmalloc()
2019-06-04 15:03:18 +02:00
idle.h
s390/time,idle: get rid of unsigned long long
2021-03-08 10:46:27 +01:00
io.h
mm: remove xlate_dev_kmem_ptr()
2021-05-07 00:26:34 -07:00
ipl.h
s390/nvme: support firmware-assisted dump to NVMe disks
2020-10-02 14:40:48 +02:00
irq_work.h
s390/smp: implement arch_irq_work_raise()
2021-02-24 00:31:22 +01:00
irq.h
s390/pci: gather statistics for floating vs directed irqs
2019-04-29 10:47:01 +02:00
irqflags.h
s390/irqflags: always inline arch irqflags functions
2021-06-18 16:41:19 +02:00
isc.h
KVM: s390: add gib_alert_irq_handler()
2019-02-05 14:29:23 +01:00
itcw.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
jump_label.h
s390/jump_label: use "i" constraint for clang
2020-01-22 13:05:35 +01:00
kasan.h
s390: setup kernel memory layout early
2021-06-18 16:41:19 +02:00
Kbuild
local64.h: make <asm/local64.h> mandatory
2020-12-29 15:36:49 -08:00
kdebug.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kexec.h
s390/kernel: build a relocatable kernel
2019-04-29 10:47:10 +02:00
kprobes.h
s390: support KPROBES_ON_FTRACE
2020-01-30 13:07:55 +01:00
kvm_host.h
KVM: stats: Separate generic stats from architecture specific ones
2021-06-24 11:47:56 -04:00
kvm_para.h
KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED
2018-03-06 18:40:44 +01:00
linkage.h
s390/linkage: increase asm symbols alignment to 16
2021-07-08 22:12:18 +02:00
livepatch.h
livepatch: Use the default ftrace_ops instead of REGS when ARGS is available
2020-11-13 12:15:28 -05:00
lowcore.h
s390/lowcore: remove superfluous __packed annotations
2021-06-07 17:07:01 +02:00
mem_detect.h
s390/mem_detect: provide single get_mem_detect_end
2019-08-26 12:51:18 +02:00
mem_encrypt.h
s390/mm: Remove sev_active() function
2019-08-09 22:52:11 +10:00
mmu_context.h
s390/mm: ensure switch_mm() is executed with interrupts disabled
2021-06-07 17:06:59 +02:00
mmu.h
Merge tag 's390-5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2020-04-04 09:45:50 -07:00
mmzone.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi.h
s390/mcck: keep machine check interruption codes sorted
2021-07-05 12:44:23 +02:00
nospec-branch.h
s390: correct nospec auto detection init order
2018-04-11 17:46:00 +02:00
nospec-insn.h
s390/nospec: rename assembler generated expoline thunks
2019-05-02 13:54:11 +02:00
numa.h
s390/mm: remove fake numa support
2020-02-27 16:02:21 +01:00
os_info.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
page-states.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
page.h
Merge tag 's390-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2021-07-04 12:17:38 -07:00
pci_clp.h
s390/pci: Implement ioremap_wc/prot() with MIO
2020-09-14 10:30:07 +02:00
pci_debug.h
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2017-11-13 11:47:01 -08:00
pci_dma.h
s390/pci: remove unused functions
2020-06-29 16:32:09 +02:00
pci_insn.h
s390: fix setting of mio addressing control
2019-07-11 20:40:02 +02:00
pci_io.h
s390/pci: Fix s390_mmio_read/write with MIO
2020-05-14 23:21:37 +02:00
pci.h
s390/pci: add zpci_set_irq()/zpci_clear_irq()
2021-06-28 11:18:28 +02:00
percpu.h
s390/cmpxchg: use register pair instead of register asm
2021-06-28 11:18:28 +02:00
perf_event.h
s390: implement perf_arch_fetch_caller_regs
2019-11-30 10:52:44 +01:00
pgalloc.h
mm/thp: define default pmd_pgtable()
2021-07-01 11:06:03 -07:00
pgtable.h
Merge tag 's390-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2021-07-04 12:17:38 -07:00
pkey.h
s390/pkey: pkey cleanup: narrow in-kernel API, fix some variable types
2019-08-21 12:58:53 +02:00
pnet.h
s390/net: move pnet constants
2019-02-07 18:06:18 -08:00
preempt.h
s390: preempt: Fix preempt_count initialization
2021-07-08 22:12:18 +02:00
processor.h
s390/processor: always inline stap() and __load_psw_mask()
2021-06-18 16:41:19 +02:00
ptdump.h
s390: add ARCH_HAS_DEBUG_WX support
2020-09-14 11:38:35 +02:00
ptrace.h
s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART
2021-07-08 22:12:17 +02:00
purgatory.h
s390/purgatory: Remove duplicate variable definitions
2018-07-06 08:47:51 +02:00
qdio.h
s390/qeth: remove QAOB's pointer to its TX buffer
2021-06-11 12:49:15 -07:00
runtime_instr.h
s390/runtime instrumentation: provide uapi header file
2018-02-02 10:47:15 +01:00
schid.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sclp.h
s390/sclp: provide extended sccb support
2020-11-18 12:16:02 +01:00
scsw.h
s390: Simplify the calculation of variables
2021-02-09 15:57:04 +01:00
seccomp.h
s390: Enable seccomp architecture tracking
2020-11-20 11:16:35 -08:00
sections.h
s390: correct __bootdata / __bootdata_preserved macros
2020-10-26 14:18:01 +01:00
serial.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
set_memory.h
s390/mm,ptdump: hold cpa mutex while walking for kernel page table dump
2020-09-14 11:38:34 +02:00
setup.h
s390/boot: replace magic string check with a bootdata flag
2021-07-05 12:44:23 +02:00
shmparam.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
signal.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sigp.h
s390/sigp: use register pair instead of register asm
2021-06-18 16:41:22 +02:00
smp.h
KVM: s390: diag9c (directed yield) forwarding
2021-03-09 10:16:26 +01:00
softirq_stack.h
s390/softirq: use call_on_stack() macro
2021-07-08 22:12:18 +02:00
sparsemem.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
spinlock_types.h
s390/spinlock: remove align attribute from arch_spinlock_t
2021-03-28 20:23:54 +02:00
spinlock.h
s390/spinlock: use R constraint in inline assembly
2021-04-12 12:46:43 +02:00
stacktrace.h
s390: rename CALL_ON_STACK_NORETURN() to call_on_stack_noreturn()
2021-07-08 22:12:18 +02:00
stp.h
s390/stp: add support for leap seconds
2020-09-26 15:51:21 +02:00
string.h
s390/string: get rid of register asm
2021-06-28 11:18:28 +02:00
switch_to.h
s390: always save and restore all registers on context switch
2017-12-05 07:51:08 +01:00
syscall_wrapper.h
s390: pass struct pt_regs instead of registers to syscalls
2021-01-19 12:29:27 +01:00
syscall.h
s390: convert to generic entry
2021-01-19 12:29:26 +01:00
sysinfo.h
s390/sysinfo: add and display licensed internal code identifier
2018-02-02 10:47:15 +01:00
termios.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
thread_info.h
s390/thread_info.h: fix task_struct declaration warning
2021-02-09 15:57:04 +01:00
timex.h
s390/timex: get rid of register asm
2021-06-28 11:18:28 +02:00
tlb.h
s390/tlb: make cleared_pXs flags consistent with generic code
2021-01-19 12:29:25 +01:00
tlbflush.h
s390: remove orphaned function declarations
2020-09-30 12:09:54 +02:00
topology.h
s390/numa: set node distance to LOCAL_DISTANCE
2020-08-11 18:16:35 +02:00
tpi.h
s390: add struct tpi_info to struct pt_regs
2021-06-07 17:07:01 +02:00
types.h
s390: introduce register pair union
2021-06-18 16:41:21 +02:00
uaccess.h
s390/uaccess: get rid of register asm
2021-06-18 16:41:23 +02:00
unistd.h
s390: wire up clone3 system call
2019-07-23 10:45:53 +02:00
unwind.h
s390/unwind: start unwinding from reliable state
2019-11-30 10:52:48 +01:00
uprobes.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
user.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uv.h
s390: mm: Fix secure storage access exception handling
2021-07-05 12:44:23 +02:00
vdso.h
s390/vdso: add minimal compat vdso
2021-07-08 15:37:28 +02:00
vga.h
s390: add a few more SPDX identifiers
2017-12-05 07:51:09 +01:00
vmalloc.h
mm/vmalloc: Add empty <asm/vmalloc.h> headers and use them from <linux/vmalloc.h>
2019-12-10 10:12:55 +01:00
vmlinux.lds.h
s390: introduce .boot.preserved.data section
2019-04-10 17:47:09 +02:00
vtime.h
s390: convert to generic entry
2021-01-19 12:29:26 +01:00
vtimer.h
s390: remove orphaned function declarations
2020-09-30 12:09:54 +02:00
vx-insn.h
s390: add alignment hints to vector load and store
2019-02-07 11:57:10 +01:00
xor.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00