The following commit has been merged into the x86/urgent branch of tip: Commit-ID: 9440c42941606af4c379afa3cf8624f0dc43a629 Gitweb: https://git.kernel.org/tip/9440c42941606af4c379afa3cf8624f0dc43a629 Author: Jiri Olsa <olsajiri@xxxxxxxxx> AuthorDate: Tue, 18 Oct 2022 14:27:08 +02:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 24 Oct 2022 17:57:28 +02:00 x86/syscall: 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 a '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 a 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'. Include asm/ptrace.h directly in syscall_wrapper.h to make sure all syscalls see 'struct pt_regs' definition. This then results in BTF for '__*_sys_*(struct pt_regs *regs)' functions to point to the actual struct, not just the forward declaration. [ bp: No Fixes tag as this is not really a bug fix but "adjustment" so that BTF is happy. ] Reported-by: Akihiro HARAI <jharai0815@xxxxxxxxx> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # this is needed only for BTF so kernels >= 5.15 Link: https://lore.kernel.org/r/20221018122708.823792-1-jolsa@xxxxxxxxxx --- arch/x86/include/asm/syscall_wrapper.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h index 59358d1..fd2669b 100644 --- a/arch/x86/include/asm/syscall_wrapper.h +++ b/arch/x86/include/asm/syscall_wrapper.h @@ -6,7 +6,7 @@ #ifndef _ASM_X86_SYSCALL_WRAPPER_H #define _ASM_X86_SYSCALL_WRAPPER_H -struct pt_regs; +#include <asm/ptrace.h> extern long __x64_sys_ni_syscall(const struct pt_regs *regs); extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
