* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
@ 2023-05-11 21:46 ` gabravier at gmail dot com
2023-05-12 0:09 ` michael.hudson at canonical dot com
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From: gabravier at gmail dot com @ 2023-05-11 21:46 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
--- Comment #1 from Gabriel Ravier <gabravier at gmail dot com> ---
PS: The bug appears to be caused by the fact that glibc internally tries to
compute a pointer to the end of the provided buffer, which results in a pretty
much guaranteed overflow given the provided value. This in turn ends up making
a later if statement of: `if (buf->base.write_ptr < buf->base.write_end)` fail,
where that if statement seems to have been meant to check for the case where
less characters than the buffer can contain have been written (which is the
case here, but the if statement thinks this is not the case because of the
pointer arithmetic overflow).
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
2023-05-11 21:46 ` [Bug stdio/30441] " gabravier at gmail dot com
@ 2023-05-12 0:09 ` michael.hudson at canonical dot com
2023-05-12 0:45 ` gabravier at gmail dot com
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From: michael.hudson at canonical dot com @ 2023-05-12 0:09 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Michael Hudson-Doyle <michael.hudson at canonical dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |michael.hudson at canonical dot co
| |m
--- Comment #2 from Michael Hudson-Doyle <michael.hudson at canonical dot com> ---
This was discussed on libc-alpha in
hhttps://inbox.sourceware.org/libc-alpha/CAOOWow1L2ZMXE6S5pd3uKvAeHNQXMPtjew42LbAiQE-Pnd2ULg@mail.gmail.com/t/#u
which didn't really reach a strong conclusion but didn't seem to regard this as
something that should be supported.
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
2023-05-11 21:46 ` [Bug stdio/30441] " gabravier at gmail dot com
2023-05-12 0:09 ` michael.hudson at canonical dot com
@ 2023-05-12 0:45 ` gabravier at gmail dot com
2023-05-14 21:29 ` michael.hudson at canonical dot com
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From: gabravier at gmail dot com @ 2023-05-12 0:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
--- Comment #3 from Gabriel Ravier <gabravier at gmail dot com> ---
Quite the interesting discussion, thanks for the link.
w.r.t. the points raised there, I generally agree that passing a value for n
larger than the actual buffer size is extremely dubious, but if the glibc
project's position is that this is an error in the C standard and the bug is
thus invalid, then I think a DR or something like that should be raised with
WG14 about this issue. Has anything like this been done ?
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (2 preceding siblings ...)
2023-05-12 0:45 ` gabravier at gmail dot com
@ 2023-05-14 21:29 ` michael.hudson at canonical dot com
2023-06-06 21:50 ` gabravier at gmail dot com
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From: michael.hudson at canonical dot com @ 2023-05-14 21:29 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
--- Comment #4 from Michael Hudson-Doyle <michael.hudson at canonical dot com> ---
Not to the best of my knowledge no. I agree it would be a good next step but
it's not something I am likely to get around to myself, if I'm honest.
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (3 preceding siblings ...)
2023-05-14 21:29 ` michael.hudson at canonical dot com
@ 2023-06-06 21:50 ` gabravier at gmail dot com
2023-06-07 1:53 ` gabravier at gmail dot com
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From: gabravier at gmail dot com @ 2023-06-06 21:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Gabriel Ravier <gabravier at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gabravier at gmail dot com
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (4 preceding siblings ...)
2023-06-06 21:50 ` gabravier at gmail dot com
@ 2023-06-07 1:53 ` gabravier at gmail dot com
2023-06-07 8:39 ` sam at gentoo dot org
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From: gabravier at gmail dot com @ 2023-06-07 1:53 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
--- Comment #5 from Gabriel Ravier <gabravier at gmail dot com> ---
I'm currently attempting to do so right now, if you want to know, although it's
somewhat unlikely that I'll get much progress on it anytime soon - right now I
haven't even managed to actually determine whether defect reports are still a
thing, and WG14 appears to be currently focused on getting C23 released (though
I'm thinking about potentially trying to get this into a ballot comment or
something like that).
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (5 preceding siblings ...)
2023-06-07 1:53 ` gabravier at gmail dot com
@ 2023-06-07 8:39 ` sam at gentoo dot org
2023-06-07 23:09 ` joseph at codesourcery dot com
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From: sam at gentoo dot org @ 2023-06-07 8:39 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sam at gentoo dot org
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (6 preceding siblings ...)
2023-06-07 8:39 ` sam at gentoo dot org
@ 2023-06-07 23:09 ` joseph at codesourcery dot com
2023-07-25 21:59 ` nbowler at draconx dot ca
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From: joseph at codesourcery dot com @ 2023-06-07 23:09 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
WG14 stopped using the "defect report" terminology when it turned out that
the issues WG14 was using it for did not meet the ISO definition of what
defect reports should be used for. At that point, WG14 changed to
referring to the issues as clarification requests instead. Maintenance of
a CR log then stopped when work on C2x started.
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3002.pdf has a proposal
for a new issue tracking process. This has not yet been discussed at a
WG14 meeting, but maybe there could be an opportunity for discussion at
the proposed October meeting (since a ballot will be running at that time,
that meeting won't be discussing any proposed for changes to the C
standard itself, which should allow more time for such administrative
discussions).
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (7 preceding siblings ...)
2023-06-07 23:09 ` joseph at codesourcery dot com
@ 2023-07-25 21:59 ` nbowler at draconx dot ca
2024-01-17 9:32 ` schwab@linux-m68k.org
2024-01-17 19:47 ` i at maskray dot me
10 siblings, 0 replies; 12+ messages in thread
From: nbowler at draconx dot ca @ 2023-07-25 21:59 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Nick Bowler <nbowler at draconx dot ca> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nbowler at draconx dot ca
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (8 preceding siblings ...)
2023-07-25 21:59 ` nbowler at draconx dot ca
@ 2024-01-17 9:32 ` schwab@linux-m68k.org
2024-01-17 19:47 ` i at maskray dot me
10 siblings, 0 replies; 12+ messages in thread
From: schwab@linux-m68k.org @ 2024-01-17 9:32 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |i at maskray dot me
--- Comment #7 from Andreas Schwab <schwab@linux-m68k.org> ---
*** Bug 31251 has been marked as a duplicate of this bug. ***
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* [Bug stdio/30441] snprintf truncates output on extremely large buffer sizes
2023-05-11 21:41 [Bug stdio/30441] New: snprintf truncates output on extremely large buffer sizes gabravier at gmail dot com
` (9 preceding siblings ...)
2024-01-17 9:32 ` schwab@linux-m68k.org
@ 2024-01-17 19:47 ` i at maskray dot me
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From: i at maskray dot me @ 2024-01-17 19:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=30441
Fangrui Song <i at maskray dot me> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=28989
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