linux-kernel - Re: [PATCHv7 bpf-next 2/9] uprobe: Wire up uretprobe system call

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Message-ID: <ZmgAawOdLZAZynA_@krava>
Date: Tue, 11 Jun 2024 09:44:43 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Oleg Nesterov <oleg@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-man@...r.kernel.org, x86@...nel.org, bpf@...r.kernel.org,
	Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
	"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>
Subject: Re: [PATCHv7 bpf-next 2/9] uprobe: Wire up uretprobe system call

On Tue, Jun 11, 2024 at 07:05:21AM +0900, Masami Hiramatsu wrote:
> On Thu, 23 May 2024 14:11:42 +0200
> Jiri Olsa <jolsa@...nel.org> wrote:
> 
> > Wiring up uretprobe system call, which comes in following changes.
> > We need to do the wiring before, because the uretprobe implementation
> > needs the syscall number.
> > 
> > Note at the moment uretprobe syscall is supported only for native
> > 64-bit process.
> > 
> 
> BTW, this does not cleanly applied to probes/for-next, based on
> 6.10-rc1. Which version did you use?

ah new syscall just got merged, I'll rebase and send new version

jirka

> 
> Thank you,
> 
> > Reviewed-by: Oleg Nesterov <oleg@...hat.com>
> > Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > Acked-by: Andrii Nakryiko <andrii@...nel.org>
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  arch/x86/entry/syscalls/syscall_64.tbl | 1 +
> >  include/linux/syscalls.h               | 2 ++
> >  include/uapi/asm-generic/unistd.h      | 5 ++++-
> >  kernel/sys_ni.c                        | 2 ++
> >  4 files changed, 9 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
> > index cc78226ffc35..47dfea0a827c 100644
> > --- a/arch/x86/entry/syscalls/syscall_64.tbl
> > +++ b/arch/x86/entry/syscalls/syscall_64.tbl
> > @@ -383,6 +383,7 @@
> >  459	common	lsm_get_self_attr	sys_lsm_get_self_attr
> >  460	common	lsm_set_self_attr	sys_lsm_set_self_attr
> >  461	common	lsm_list_modules	sys_lsm_list_modules
> > +462	64	uretprobe		sys_uretprobe
> >  
> >  #
> >  # Due to a historical design error, certain syscalls are numbered differently
> > diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> > index e619ac10cd23..5318e0e76799 100644
> > --- a/include/linux/syscalls.h
> > +++ b/include/linux/syscalls.h
> > @@ -972,6 +972,8 @@ asmlinkage long sys_lsm_list_modules(u64 *ids, u32 *size, u32 flags);
> >  /* x86 */
> >  asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int on);
> >  
> > +asmlinkage long sys_uretprobe(void);
> > +
> >  /* pciconfig: alpha, arm, arm64, ia64, sparc */
> >  asmlinkage long sys_pciconfig_read(unsigned long bus, unsigned long dfn,
> >  				unsigned long off, unsigned long len,
> > diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
> > index 75f00965ab15..8a747cd1d735 100644
> > --- a/include/uapi/asm-generic/unistd.h
> > +++ b/include/uapi/asm-generic/unistd.h
> > @@ -842,8 +842,11 @@ __SYSCALL(__NR_lsm_set_self_attr, sys_lsm_set_self_attr)
> >  #define __NR_lsm_list_modules 461
> >  __SYSCALL(__NR_lsm_list_modules, sys_lsm_list_modules)
> >  
> > +#define __NR_uretprobe 462
> > +__SYSCALL(__NR_uretprobe, sys_uretprobe)
> > +
> >  #undef __NR_syscalls
> > -#define __NR_syscalls 462
> > +#define __NR_syscalls 463
> >  
> >  /*
> >   * 32 bit systems traditionally used different
> > diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
> > index faad00cce269..be6195e0d078 100644
> > --- a/kernel/sys_ni.c
> > +++ b/kernel/sys_ni.c
> > @@ -391,3 +391,5 @@ COND_SYSCALL(setuid16);
> >  
> >  /* restartable sequence */
> >  COND_SYSCALL(rseq);
> > +
> > +COND_SYSCALL(uretprobe);
> > -- 
> > 2.45.1
> > 
> 
> 
> -- 
> Masami Hiramatsu (Google) <mhiramat@...nel.org>