Re: [PATCH 5.10 147/243] NFSD: Fix TP_printk() format specifier in nfsd_clid_class

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On Wed, Jul 21, 2021 at 10:04:13AM -0400, Steven Rostedt wrote:
On Tue, 20 Jul 2021 23:48:47 +0200
Pavel Machek <pavel@xxxxxxx> wrote:

Hi!

> [ Upstream commit a948b1142cae66785521a389cab2cce74069b547 ]
>
> Since commit 9a6944fee68e ("tracing: Add a verifier to check string
> pointers for trace events"), which was merged in v5.13-rc1,
> TP_printk() no longer tacitly supports the "%.*s" format specifier.
>
> These are low value tracepoints, so just remove them.

So I understand we want this for mainline, but AFAICT 5.10 does not
have 9a6944fee68e ("tracing: Add a verifier to check string pointers
for trace events") commit, so this does not fix any bug and removal of
tracepoints can be surprising.


Thanks for pointing this out. I get so many stable patches, I don't
have time to look at all of them.

Greg, I don't think this should be backported. The verifier code had a
bug in it that broke the '%.*s' formats. This patch removed the good
code because of the broken code.

See eb01f5353bdaa ("tracing: Handle %.*s in trace_check_vprintf()")

Uh, yes, I'll drop it. Thanks for catching this!

--
Thanks,
Sasha



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