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Date: Wed, 27 Feb 2019 14:32:41 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Masami Hiramatsu <mhiramat@...nel.org> Cc: Steven Rostedt <rostedt@...dmis.org>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>, Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Changbin Du <changbin.du@...il.com>, Jann Horn <jannh@...gle.com>, Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...nel.org>, Nadav Amit <namit@...are.com>, Peter Zijlstra <peterz@...radead.org> Subject: Re: [PATCH v3 0/5] tracing/probes: uaccess: Add support user-space access On Wed, Feb 27, 2019 at 11:42:15PM +0900, Masami Hiramatsu wrote: > > For perf-probe, we can add some attribute for each argument > which indicate that the variable in user space. But still > we can not decide it automatically by DWARF since __user attribute > is not transrated to DWARF attribute. clang has partial support for __attribute__((noderef, address_space(1))) We'll work on patches to make it complete and pass __user attribute all the way to debug info. If somebody can work with gcc folks to do the same that would be awesome.
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