[Bug stdio/27024] New: Wrong access (read_only, 3, 4) attribute for readlinkat

[Bug stdio/27024] New: Wrong access (read_only, 3, 4) attribute for readlinkat

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

            Bug ID: 27024
           Summary: Wrong access (read_only, 3, 4) attribute for
                    readlinkat
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
                CC: msebor at redhat dot com
  Target Milestone: ---

Since g:06febd8c670, there's a bad access attribute:

posix/unistd.h:

/* Like readlink but a relative PATH is interpreted relative to FD.  */
extern ssize_t readlinkat (int __fd, const char *__restrict __path,
                           char *__restrict __buf, size_t __len)
     __THROW __nonnull ((2, 3)) __wur __attr_access ((__read_only__, 3, 4));
#endif

it guess it should be write_only.

@Martin: Can you please take a look?

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[richardpku at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

Richard Li <richardpku at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |richardpku at gmail dot com

--- Comment #1 from Richard Li <richardpku at gmail dot com> ---
Encountered this bug too.

Got a warning, something like "buffer may be used uninitialized".  Changing it
to write_only fixes it.

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

--- Comment #2 from Martin Liska <mliska at suse dot cz> ---
@Martin: May I please ping this issue..

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[msebor at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

Martin Sebor <msebor at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |msebor at gmail dot com

--- Comment #3 from Martin Sebor <msebor at gmail dot com> ---
Ah, yes, thanks!  I remembered you'd CC'd me on a bug but couldn't find it.  I
now see why: I searched for msebor@gmail.com and it's under @redhat.com.

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

--- Comment #4 from Martin Liska <mliska at suse dot cz> ---
Heh. I guess the fix is quite easy..

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[msebor at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

--- Comment #5 from Martin Sebor <msebor at gmail dot com> ---
Patch: https://sourceware.org/pipermail/libc-alpha/2021-January/121422.html

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[msebor at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

Martin Sebor <msebor at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #6 from Martin Sebor <msebor at redhat dot com> ---
Fixed in g:2cd361b511.

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[Bug stdio/27024] Wrong access (read_only, 3, 4) attribute for readlinkat

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27024

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-
                 CC|                            |fweimer at redhat dot com
   Target Milestone|---                         |2.33

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