* [PATCH] perf tools: Fix mode setting in copyfile_mode_ns()
@ 2019-10-07 7:02 Adrian Hunter
2019-10-07 10:47 ` Jiri Olsa
2019-10-21 6:26 ` [tip: perf/urgent] " tip-bot2 for Adrian Hunter
0 siblings, 2 replies; 4+ messages in thread
From: Adrian Hunter @ 2019-10-07 7:02 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo, Jiri Olsa; +Cc: linux-kernel
slow_copyfile() opens the file by name, so "write" permissions must not
be removed in copyfile_mode_ns() before calling slow_copyfile().
Example:
Before:
$ sudo chmod +r /proc/kcore
$ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
$ tools/perf/perf buildid-cache -k /proc/kcore
Couldn't add /proc/kcore
After:
$ sudo chmod +r /proc/kcore
$ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
$ tools/perf/perf buildid-cache -v -k /proc/kcore
kcore added to build-id cache directory /home/ahunter/.debug/[kernel.kcore]/37e340b1b5a7cf4f57ba8de2bc777359588a957f/2019100709562289
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/copyfile.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
index 3fa0db136667..47e03de7c235 100644
--- a/tools/perf/util/copyfile.c
+++ b/tools/perf/util/copyfile.c
@@ -101,14 +101,16 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
if (tofd < 0)
goto out;
- if (fchmod(tofd, mode))
- goto out_close_to;
-
if (st.st_size == 0) { /* /proc? do it slowly... */
err = slow_copyfile(from, tmp, nsi);
+ if (!err && fchmod(tofd, mode))
+ err = -1;
goto out_close_to;
}
+ if (fchmod(tofd, mode))
+ goto out_close_to;
+
nsinfo__mountns_enter(nsi, &nsc);
fromfd = open(from, O_RDONLY);
nsinfo__mountns_exit(&nsc);
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] perf tools: Fix mode setting in copyfile_mode_ns()
2019-10-07 7:02 [PATCH] perf tools: Fix mode setting in copyfile_mode_ns() Adrian Hunter
@ 2019-10-07 10:47 ` Jiri Olsa
2019-10-15 15:07 ` Arnaldo Carvalho de Melo
2019-10-21 6:26 ` [tip: perf/urgent] " tip-bot2 for Adrian Hunter
1 sibling, 1 reply; 4+ messages in thread
From: Jiri Olsa @ 2019-10-07 10:47 UTC (permalink / raw)
To: Adrian Hunter; +Cc: Arnaldo Carvalho de Melo, linux-kernel
On Mon, Oct 07, 2019 at 10:02:21AM +0300, Adrian Hunter wrote:
> slow_copyfile() opens the file by name, so "write" permissions must not
> be removed in copyfile_mode_ns() before calling slow_copyfile().
>
> Example:
>
> Before:
> $ sudo chmod +r /proc/kcore
> $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
> $ tools/perf/perf buildid-cache -k /proc/kcore
> Couldn't add /proc/kcore
>
> After:
> $ sudo chmod +r /proc/kcore
> $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
> $ tools/perf/perf buildid-cache -v -k /proc/kcore
> kcore added to build-id cache directory /home/ahunter/.debug/[kernel.kcore]/37e340b1b5a7cf4f57ba8de2bc777359588a957f/2019100709562289
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
thanks,
jirka
> ---
> tools/perf/util/copyfile.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
> index 3fa0db136667..47e03de7c235 100644
> --- a/tools/perf/util/copyfile.c
> +++ b/tools/perf/util/copyfile.c
> @@ -101,14 +101,16 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
> if (tofd < 0)
> goto out;
>
> - if (fchmod(tofd, mode))
> - goto out_close_to;
> -
> if (st.st_size == 0) { /* /proc? do it slowly... */
> err = slow_copyfile(from, tmp, nsi);
> + if (!err && fchmod(tofd, mode))
> + err = -1;
> goto out_close_to;
> }
>
> + if (fchmod(tofd, mode))
> + goto out_close_to;
> +
> nsinfo__mountns_enter(nsi, &nsc);
> fromfd = open(from, O_RDONLY);
> nsinfo__mountns_exit(&nsc);
> --
> 2.17.1
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] perf tools: Fix mode setting in copyfile_mode_ns()
2019-10-07 10:47 ` Jiri Olsa
@ 2019-10-15 15:07 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 4+ messages in thread
From: Arnaldo Carvalho de Melo @ 2019-10-15 15:07 UTC (permalink / raw)
To: Jiri Olsa; +Cc: Adrian Hunter, linux-kernel
Em Mon, Oct 07, 2019 at 12:47:47PM +0200, Jiri Olsa escreveu:
> On Mon, Oct 07, 2019 at 10:02:21AM +0300, Adrian Hunter wrote:
> > slow_copyfile() opens the file by name, so "write" permissions must not
> > be removed in copyfile_mode_ns() before calling slow_copyfile().
> >
> > Example:
> >
> > Before:
> > $ sudo chmod +r /proc/kcore
> > $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
> > $ tools/perf/perf buildid-cache -k /proc/kcore
> > Couldn't add /proc/kcore
> >
> > After:
> > $ sudo chmod +r /proc/kcore
> > $ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
> > $ tools/perf/perf buildid-cache -v -k /proc/kcore
> > kcore added to build-id cache directory /home/ahunter/.debug/[kernel.kcore]/37e340b1b5a7cf4f57ba8de2bc777359588a957f/2019100709562289
> >
> > Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>
> Acked-by: Jiri Olsa <jolsa@kernel.org>
Thanks, applied to perf/urgent.
- Arnaldo
> thanks,
> jirka
>
> > ---
> > tools/perf/util/copyfile.c | 8 +++++---
> > 1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
> > index 3fa0db136667..47e03de7c235 100644
> > --- a/tools/perf/util/copyfile.c
> > +++ b/tools/perf/util/copyfile.c
> > @@ -101,14 +101,16 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
> > if (tofd < 0)
> > goto out;
> >
> > - if (fchmod(tofd, mode))
> > - goto out_close_to;
> > -
> > if (st.st_size == 0) { /* /proc? do it slowly... */
> > err = slow_copyfile(from, tmp, nsi);
> > + if (!err && fchmod(tofd, mode))
> > + err = -1;
> > goto out_close_to;
> > }
> >
> > + if (fchmod(tofd, mode))
> > + goto out_close_to;
> > +
> > nsinfo__mountns_enter(nsi, &nsc);
> > fromfd = open(from, O_RDONLY);
> > nsinfo__mountns_exit(&nsc);
> > --
> > 2.17.1
> >
--
- Arnaldo
^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip: perf/urgent] perf tools: Fix mode setting in copyfile_mode_ns()
2019-10-07 7:02 [PATCH] perf tools: Fix mode setting in copyfile_mode_ns() Adrian Hunter
2019-10-07 10:47 ` Jiri Olsa
@ 2019-10-21 6:26 ` tip-bot2 for Adrian Hunter
1 sibling, 0 replies; 4+ messages in thread
From: tip-bot2 for Adrian Hunter @ 2019-10-21 6:26 UTC (permalink / raw)
To: linux-tip-commits
Cc: Adrian Hunter, Jiri Olsa, Arnaldo Carvalho de Melo, Ingo Molnar,
Borislav Petkov, linux-kernel
The following commit has been merged into the perf/urgent branch of tip:
Commit-ID: 5a0baf5123236362fda4e9772cc63b7faa16a0df
Gitweb: https://git.kernel.org/tip/5a0baf5123236362fda4e9772cc63b7faa16a0df
Author: Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Mon, 07 Oct 2019 10:02:21 +03:00
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Tue, 15 Oct 2019 12:05:18 -03:00
perf tools: Fix mode setting in copyfile_mode_ns()
slow_copyfile() opens the file by name, so "write" permissions must not
be removed in copyfile_mode_ns() before calling slow_copyfile().
Example:
Before:
$ sudo chmod +r /proc/kcore
$ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
$ tools/perf/perf buildid-cache -k /proc/kcore
Couldn't add /proc/kcore
After:
$ sudo chmod +r /proc/kcore
$ sudo setcap "cap_sys_admin,cap_sys_ptrace,cap_syslog,cap_sys_rawio=ep" tools/perf/perf
$ tools/perf/perf buildid-cache -v -k /proc/kcore
kcore added to build-id cache directory /home/ahunter/.debug/[kernel.kcore]/37e340b1b5a7cf4f57ba8de2bc777359588a957f/2019100709562289
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lore.kernel.org/lkml/20191007070221.11158-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/copyfile.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/copyfile.c b/tools/perf/util/copyfile.c
index 3fa0db1..47e03de 100644
--- a/tools/perf/util/copyfile.c
+++ b/tools/perf/util/copyfile.c
@@ -101,14 +101,16 @@ static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
if (tofd < 0)
goto out;
- if (fchmod(tofd, mode))
- goto out_close_to;
-
if (st.st_size == 0) { /* /proc? do it slowly... */
err = slow_copyfile(from, tmp, nsi);
+ if (!err && fchmod(tofd, mode))
+ err = -1;
goto out_close_to;
}
+ if (fchmod(tofd, mode))
+ goto out_close_to;
+
nsinfo__mountns_enter(nsi, &nsc);
fromfd = open(from, O_RDONLY);
nsinfo__mountns_exit(&nsc);
^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-10-21 6:27 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2019-10-07 7:02 [PATCH] perf tools: Fix mode setting in copyfile_mode_ns() Adrian Hunter
2019-10-07 10:47 ` Jiri Olsa
2019-10-15 15:07 ` Arnaldo Carvalho de Melo
2019-10-21 6:26 ` [tip: perf/urgent] " tip-bot2 for Adrian Hunter
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