f8c2602733
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>
107 lines
2.8 KiB
ArmAsm
107 lines
2.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright IBM Corp. 2008, 2009
|
|
*
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ftrace.h>
|
|
#include <asm/nospec-insn.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/export.h>
|
|
|
|
GEN_BR_THUNK %r1
|
|
GEN_BR_THUNK %r14
|
|
|
|
.section .kprobes.text, "ax"
|
|
|
|
ENTRY(ftrace_stub)
|
|
BR_EX %r14
|
|
ENDPROC(ftrace_stub)
|
|
|
|
#define STACK_FRAME_SIZE (STACK_FRAME_OVERHEAD + __PT_SIZE)
|
|
#define STACK_PTREGS (STACK_FRAME_OVERHEAD)
|
|
#define STACK_PTREGS_GPRS (STACK_PTREGS + __PT_GPRS)
|
|
#define STACK_PTREGS_PSW (STACK_PTREGS + __PT_PSW)
|
|
#ifdef __PACK_STACK
|
|
/* allocate just enough for r14, r15 and backchain */
|
|
#define TRACED_FUNC_FRAME_SIZE 24
|
|
#else
|
|
#define TRACED_FUNC_FRAME_SIZE STACK_FRAME_OVERHEAD
|
|
#endif
|
|
|
|
ENTRY(ftrace_caller)
|
|
.globl ftrace_regs_caller
|
|
.set ftrace_regs_caller,ftrace_caller
|
|
stg %r14,(__SF_GPRS+8*8)(%r15) # save traced function caller
|
|
lghi %r14,0 # save condition code
|
|
ipm %r14 # don't put any instructions
|
|
sllg %r14,%r14,16 # clobbering CC before this point
|
|
lgr %r1,%r15
|
|
# allocate stack frame for ftrace_caller to contain traced function
|
|
aghi %r15,-TRACED_FUNC_FRAME_SIZE
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
|
stg %r0,(__SF_GPRS+8*8)(%r15)
|
|
stg %r15,(__SF_GPRS+9*8)(%r15)
|
|
# allocate pt_regs and stack frame for ftrace_trace_function
|
|
aghi %r15,-STACK_FRAME_SIZE
|
|
stg %r1,(STACK_PTREGS_GPRS+15*8)(%r15)
|
|
stg %r14,(STACK_PTREGS_PSW)(%r15)
|
|
lg %r14,(__SF_GPRS+8*8)(%r1) # restore original return address
|
|
stosm (STACK_PTREGS_PSW)(%r15),0
|
|
aghi %r1,-TRACED_FUNC_FRAME_SIZE
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
|
stg %r0,(STACK_PTREGS_PSW+8)(%r15)
|
|
stmg %r2,%r14,(STACK_PTREGS_GPRS+2*8)(%r15)
|
|
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
|
|
aghik %r2,%r0,-MCOUNT_INSN_SIZE
|
|
lgrl %r4,function_trace_op
|
|
lgrl %r1,ftrace_func
|
|
#else
|
|
lgr %r2,%r0
|
|
aghi %r2,-MCOUNT_INSN_SIZE
|
|
larl %r4,function_trace_op
|
|
lg %r4,0(%r4)
|
|
larl %r1,ftrace_func
|
|
lg %r1,0(%r1)
|
|
#endif
|
|
lgr %r3,%r14
|
|
la %r5,STACK_PTREGS(%r15)
|
|
BASR_EX %r14,%r1
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
# The j instruction gets runtime patched to a nop instruction.
|
|
# See ftrace_enable_ftrace_graph_caller.
|
|
.globl ftrace_graph_caller
|
|
ftrace_graph_caller:
|
|
j ftrace_graph_caller_end
|
|
lmg %r2,%r3,(STACK_PTREGS_GPRS+14*8)(%r15)
|
|
lg %r4,(STACK_PTREGS_PSW+8)(%r15)
|
|
brasl %r14,prepare_ftrace_return
|
|
stg %r2,(STACK_PTREGS_GPRS+14*8)(%r15)
|
|
ftrace_graph_caller_end:
|
|
.globl ftrace_graph_caller_end
|
|
#endif
|
|
lg %r1,(STACK_PTREGS_PSW+8)(%r15)
|
|
lmg %r2,%r15,(STACK_PTREGS_GPRS+2*8)(%r15)
|
|
BR_EX %r1
|
|
ENDPROC(ftrace_caller)
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
|
|
ENTRY(return_to_handler)
|
|
stmg %r2,%r5,32(%r15)
|
|
lgr %r1,%r15
|
|
aghi %r15,-STACK_FRAME_OVERHEAD
|
|
stg %r1,__SF_BACKCHAIN(%r15)
|
|
brasl %r14,ftrace_return_to_handler
|
|
aghi %r15,STACK_FRAME_OVERHEAD
|
|
lgr %r14,%r2
|
|
lmg %r2,%r5,32(%r15)
|
|
BR_EX %r14
|
|
ENDPROC(return_to_handler)
|
|
|
|
#endif
|