Re: [PATCH] selftests/ftrace: allow relative paths in eprobe test

[Masami Hiramatsu (Google) <mhiramat@kernel.org>]

On Tue, 4 Aug 2026 21:51:01 +0200
Martin Kaiser <martin@kaiser.cx> wrote:

> Thus wrote Masami Hiramatsu (mhiramat@kernel.org):
> 
> > On Tue, 21 Jul 2026 22:05:59 +0200
> > Martin Kaiser <martin@kaiser.cx> wrote:
> 
> > > The add/remove eprobe test installs an eprobe for the openat syscall,
> > > runs ls and checks the filenames that were opened.
> 
> > > Commit 206b25c09080 ("tracing: eprobe: read the complete FILTER_PTR_STRING
> > > pointer") fixed access to some string fields in eprobes. This allows for
> > > dereferencing more filenames. In some cases, the log now shows a file
> > > with a relative path instead of "(fault)". A relative path makes the
> > > test fail.
> 
> > > Relax the filename checks to fix the test. Allow shared libraries and
> > > locale configs that use a relative path.
> 
> > Hmm, should we check this "nocontent" ? This change seems a bit fragile.
> > I think we should use another syscall to make sure getting filename
> > correctly. At least this point, removing nocontent check will be better.
> 
> I've just sent another patch that uses chdir instead of openat. For chdir, we
> know which filename we'll see in the logs and we can use a simpler filter.
> 

Sounds nice, Thanks!

> Best regards,
> Martin


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>