linux-kernel - Re: [tip:perf/urgent] perf symbols: Check '/tmp/perf-' symbol file ownership

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Message-ID: <4E435FDF.9030304@gmail.com>
Date:	Wed, 10 Aug 2011 22:51:43 -0600
From:	David Ahern <dsahern@...il.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	acme@...hat.com, fweisbec@...il.com, penberg@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, mingo@...e.hu
CC:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf symbols: Check '/tmp/perf-' symbol file
 ownership

On 08/10/2011 03:48 AM, tip-bot for Pekka Enberg wrote:
> Commit-ID:  981c1252691f4b855f2bb47ea93fb6052ea3aee2
> Gitweb:     http://git.kernel.org/tip/981c1252691f4b855f2bb47ea93fb6052ea3aee2
> Author:     Pekka Enberg <penberg@...nel.org>
> AuthorDate: Tue, 9 Aug 2011 22:54:18 +0300
> Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
> CommitDate: Tue, 9 Aug 2011 15:23:08 -0300
> 
> perf symbols: Check '/tmp/perf-' symbol file ownership
> 
> The external symbol files are generated by JIT compilers, for example, but we
> need to make sure they're ours before injecting them to 'perf report'.
> 
> Requested-by: Ingo Molnar <mingo@...e.hu>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Link: http://lkml.kernel.org/r/1312919658-17158-1-git-send-email-penberg@kernel.org
> Signed-off-by: Pekka Enberg <penberg@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/util/symbol.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index eec1963..a8b5371 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1504,6 +1504,17 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
>  	dso->adjust_symbols = 0;
>  
>  	if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
> +		struct stat st;
> +
> +		if (stat(dso->name, &st) < 0)
> +			return -1;
> +
> +		if (st.st_uid && (st.st_uid != geteuid())) {
> +			pr_warning("File %s not owned by current user or root, "
> +				"ignoring it.\n", dso->name);
> +			return -1;
> +		}

Is the force option relevant here -- similar to perf_session__open()?

David

> +
>  		ret = dso__load_perf_map(dso, map, filter);
>  		dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
>  					      SYMTAB__NOT_FOUND;
> --
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