x86: Include asm/ptrace.h in syscall_wrapper header
With just the forward declaration of the 'struct pt_regs' in
syscall_wrapper.h, the syscall stub functions:
__[x64|ia32]_sys_*(struct pt_regs *regs)
will have different definition of 'regs' argument in BTF data
based on which object file they are defined in.
If the syscall's object includes 'struct pt_regs' definition,
the BTF argument data will point to 'struct pt_regs' record,
like:
[226] STRUCT 'pt_regs' size=168 vlen=21
'r15' type_id=1 bits_offset=0
'r14' type_id=1 bits_offset=64
'r13' type_id=1 bits_offset=128
...
If not, it will point to fwd declaration record:
[15439] FWD 'pt_regs' fwd_kind=struct
and make bpf tracing program hooking on those functions unable
to access fields from 'struct pt_regs'.
Including asm/ptrace.h directly in syscall_wrapper.h to make
sure all syscalls see 'struct pt_regs' definition and resulted
BTF for '__*_sys_*(struct pt_regs *regs)' functions point to
actual struct, not just forward declaration.
Reported-by: Akihiro HARAI <jharai0815@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
1 file changed
