[Bug regex/5945] regoff_t wrong has posix type

[Bug regex/5945] regoff_t wrong has posix type

[bonzini at gnu dot org]

http://sourceware.org/bugzilla/show_bug.cgi?id=5945

Paolo Bonzini <bonzini at gnu dot org> changed:

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                 CC|                            |bugdal at aerifal dot cx

--- Comment #5 from Paolo Bonzini <bonzini at gnu dot org> 2011-06-17 10:41:59 UTC ---
*** Bug 12900 has been marked as a duplicate of this bug. ***

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[Bug regex/5945] regoff_t wrong has posix type

[eggert at gnu dot org]

http://sourceware.org/bugzilla/show_bug.cgi?id=5945

Paul Eggert <eggert at gnu dot org> changed:

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                 CC|                            |eggert at gnu dot org

--- Comment #6 from Paul Eggert <eggert at gnu dot org> 2013-02-08 01:51:43 UTC ---
The original bug report is old, and POSIX has changed in the meantime: regoff_t
is now required to be at least as large as ptrdiff_t and ssize_t. (Previously
this was off_t and ssize_t.)  See:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/regex.h.html

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[Bug regex/5945] regoff_t wrong has posix type

[bugdal at aerifal dot cx]

http://sourceware.org/bugzilla/show_bug.cgi?id=5945

--- Comment #7 from Rich Felker <bugdal at aerifal dot cx> 2013-02-08 02:32:02 UTC ---
Yes, thanks for updating/clarifying that. Is there any chance of this ever
getting fixed? I suspect there may even be obscure vulnerabilities related to
this, if you can somehow pass a string longer than 4gb to regexec and cause the
matches to get truncated, and thus for the caller to either dereference memory
at a negative offset, exposing data it should not, or treating non-matching
data early in the string as a match.

Obviously these could be closed by making the interface even more
non-conforming and rejecting offsets that would overflow, but I think the
proper solution is to add a versioned symbol and fix the type.

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[Bug regex/5945] regoff_t wrong has posix type

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=5945

Florian Weimer <fweimer at redhat dot com> changed:

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                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

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[Bug regex/5945] regoff_t wrong has posix type

[filbranden at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=5945

Filipe Brandenburger <filbranden at google dot com> changed:

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[Bug regex/5945] New: regoff_t wrong has posix type

[vik at forgottenroots dot de]

The type regoff_t should hold at least the same amount of bytes as off_t and
ssize_t 
here: http://www.opengroup.org/onlinepubs/009695399/basedefs/regex.h.html
It's defined in regex.h as 'int` so it won't hold off_t on a 64bit machine or a
32bit machine where off_t 64bit support is enabled (#define _FILE_OFFSET_BITS 64)

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           Summary: regoff_t wrong has posix type
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: regex
        AssignedTo: drepper at redhat dot com
        ReportedBy: vik at forgottenroots dot de
                CC: glibc-bugs-regex at sources dot redhat dot com,glibc-
                    bugs at sources dot redhat dot com


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[Bug regex/5945] regoff_t wrong has posix type

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-03-30 04:30 -------
This is known but obviously cannot easily be fixed.  Suspended until somebody
takes this serious to actually take a stab at a solution.

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             Status|NEW                         |SUSPENDED


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[Bug regex/5945] regoff_t wrong has posix type

[bonzini at gnu dot org]

------- Additional Comments From bonzini at gnu dot org  2008-08-18 10:09 -------
You mean, it cannot be easily fixed because it breaks the ABI?

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[Bug regex/5945] regoff_t wrong has posix type

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-08-18 14:04 -------
(In reply to comment #2)
> You mean, it cannot be easily fixed because it breaks the ABI?

Yes.

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[Bug regex/5945] regoff_t wrong has posix type

[bonzini at gnu dot org]

------- Additional Comments From bonzini at gnu dot org  2010-09-09 15:44 -------
On bug-gnulib, the following suggestion was made by Bruno Haible:

> [glibc could] offer some preprocessor macro that makes regoff_t 64-bit wide -
> like it was done for off_t.
> 
> Would glibc need to export additional symbols for this? Yes.
> 
> Would a compiled glibc need to contain two copies of the regex code? No, the
> 32-bit version could be a thin wrapper around the 64-bit version.

I guess this would count as "somebody takes this serious to actually take a stab
at a solution".  Would _REGEX_OFFSET_BITS be okay for you as a macro?

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