[Bug 15446] New: sysctl(2) can return EACCES without sufficient permissions

[Bug 15446] New: sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

http://bugzilla.kernel.org/show_bug.cgi?id=15446

               URL: http://sourceforge.net/mailarchive/forum.php?thread_na
                    me=364299f41003042320n7437e4a2j219b32a0a5f8dc50%40mail
                    .gmail.com&forum_name=ltp-list
           Summary: sysctl(2) can return EACCES without sufficient
                    permissions
           Product: Documentation
           Version: unspecified
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: yaneurabeya-/E1597aS9LQAvxtiuMwx3w@public.gmane.org
        Regression: No


After a semi-lengthy discussion, it turns out that EACCES can and would be set
in cases where a sysctl(2) isn't available [in the old model, pending a bug in
test_perm] or the file isn't accessible [in the new model].

This currently isn't documented as such in the manpage.

It would probably be prudent to add the following to the manpage:

    EACCES The requested access to the sysctl is not allowed.

More testing will need to be performed to ensure that other unexpected errors
don't pop up with sysctl(2), if possible time-wise.

Credit goes to Shi Weihua for finding the documentation bug, and Eric W.
Biederman for noting the bug in the original sysctl(2) implementation.

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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

http://bugzilla.kernel.org/show_bug.cgi?id=15446


Garrett Cooper <yaneurabeya-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |low




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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=15446





--- Comment #1 from Garrett Cooper <yaneurabeya-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>  2010-08-17 06:57:57 ---
Would someone please look into patching the manpage for this requirement?

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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=15446


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org




--- Comment #2 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2010-08-31 04:52:32 ---
(In reply to comment #1)
> Would someone please look into patching the manpage for this requirement?

Garret, could you provide a pointer to the discussion that you mentioned in the
report?

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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=15446


Garrett Cooper <yanegomi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yanegomi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org




--- Comment #3 from Garrett Cooper <yanegomi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2011-01-14 23:18:44 ---
Sorry -- I canceled my Yahoo email account. Here's a link to this discussion:
https://lkml.org/lkml/2010/3/4/309 .

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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=15446


Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |CODE_FIX




--- Comment #4 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2012-12-21 18:23:21 ---
Garrett, I've applied a different patch from what you suggest, essentially just
making EACCES a synonym of EPERM.

index bb2d9a5..b1772d5 100644
--- a/man2/sysctl.2
+++ b/man2/sysctl.2
@@ -78,6 +78,7 @@ Otherwise, a value of \-1 is returned and
 is set to indicate the error.
 .SH ERRORS
 .TP
+.TP
 .B EFAULT
 The invocation asked for the previous value by setting
 .I oldval
@@ -88,7 +89,7 @@ non-NULL, but allowed zero room in
 .I name
 was not found.
 .TP
-.B EPERM
+.BR EACCES ", " EPERM
 No search permission for one of the encountered "directories",
 or no read permission where
 .I oldval
lines 1-21/21 (END)

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[Bug 15446] sysctl(2) can return EACCES without sufficient permissions

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=15446





--- Comment #5 from Garrett Cooper <yanegomi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2012-12-21 20:31:19 ---
LGTM. Thanks!

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