* wcsxfrm() with empty locale crashes the runtime
@ 2019-03-19 19:28 LRN
2019-03-19 20:42 ` Corinna Vinschen
2019-03-19 20:51 ` Brian Inglis
0 siblings, 2 replies; 4+ messages in thread
From: LRN @ 2019-03-19 19:28 UTC (permalink / raw)
To: cygwin
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The testcase is attached. Running it with Cygwin-i386 leads to a crash. My
guess is that the implementation is not POSIX-conformant and tries to
dereference the first argument (NULL), even though the third argument is 0.
Tested with Cygwin-3.0.4.
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#include <wchar.h>
#include <stdlib.h>
#include <locale.h>
int
main ()
{
wchar_t w[2] = { L'z', L'\0' };
setlocale (LC_ALL, "");
int l = wcsxfrm (NULL, w, 0);
return l;
}
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: wcsxfrm() with empty locale crashes the runtime
2019-03-19 19:28 wcsxfrm() with empty locale crashes the runtime LRN
@ 2019-03-19 20:42 ` Corinna Vinschen
2019-03-20 7:18 ` LRN
2019-03-19 20:51 ` Brian Inglis
1 sibling, 1 reply; 4+ messages in thread
From: Corinna Vinschen @ 2019-03-19 20:42 UTC (permalink / raw)
To: LRN; +Cc: cygwin
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On Mar 19 22:28, LRN wrote:
> The testcase is attached. Running it with Cygwin-i386 leads to a crash. My
> guess is that the implementation is not POSIX-conformant and tries to
> dereference the first argument (NULL), even though the third argument is 0.
>
> Tested with Cygwin-3.0.4.
> #include <wchar.h>
> #include <stdlib.h>
> #include <locale.h>
>
> int
> main ()
> {
> wchar_t w[2] = { L'z', L'\0' };
> setlocale (LC_ALL, "");
> int l = wcsxfrm (NULL, w, 0);
> return l;
> }
Thanks for the testcase. The problem has been introduced in commit
c0d7d3e1a2fa (*) when it turned out that combining the LCMAP_SORTKEY and
LCMAP_BYTEREV flags to LCMapStringW(**) were not such a good idea after
all. The fix at the time was to do the byte swap ourselves, but that
patch forgot to take a char count of 0 into account.
I pushed a patch and uploaded new developer snapshots to
https://cygwin.com/snapshots/
Pleas give them a try.
Thanks,
Corinna
(*) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=commitdiff;h=c0d7d3e1a2fa
(**) https://docs.microsoft.com/en-us/windows/desktop/api/winnls/nf-winnls-lcmapstringex
--
Corinna Vinschen
Cygwin Maintainer
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: wcsxfrm() with empty locale crashes the runtime
2019-03-19 19:28 wcsxfrm() with empty locale crashes the runtime LRN
2019-03-19 20:42 ` Corinna Vinschen
@ 2019-03-19 20:51 ` Brian Inglis
1 sibling, 0 replies; 4+ messages in thread
From: Brian Inglis @ 2019-03-19 20:51 UTC (permalink / raw)
To: cygwin
On 2019-03-19 13:28, LRN wrote:
> The testcase is attached. Running it with Cygwin-i386 leads to a crash. My
> guess is that the implementation is not POSIX-conformant and tries to
> dereference the first argument (NULL), even though the third argument is 0.
>
> Tested with Cygwin-3.0.4.
$ man wcsxfrm
...
If n is 0, stra may be a NULL pointer.
(NOT Cygwin:) The current implementation of wcsxfrm simply uses wcslcpy
and does not support any language-specific transformations.
...
As wcslcpy is a BSD extension, any expectations are excessive; OpenBSD says:
"Also note that wcslcpy() and wcslcat() only operate on wide strings that are
terminated with a null wide character (L'\0'). This means that for wcslcpy() src
must be terminated with a null wide character..."
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: wcsxfrm() with empty locale crashes the runtime
2019-03-19 20:42 ` Corinna Vinschen
@ 2019-03-20 7:18 ` LRN
0 siblings, 0 replies; 4+ messages in thread
From: LRN @ 2019-03-20 7:18 UTC (permalink / raw)
To: cygwin
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On 19.03.2019 23:42, Corinna Vinschen wrote:
> On Mar 19 22:28, LRN wrote:
>> The testcase is attached. Running it with Cygwin-i386 leads to a crash.
>
> I pushed a patch and uploaded new developer snapshots to
> https://cygwin.com/snapshots/
>
> Pleas give them a try.
>
Gave them a try, doesn't crash anymore.
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2019-03-19 19:28 wcsxfrm() with empty locale crashes the runtime LRN
2019-03-19 20:42 ` Corinna Vinschen
2019-03-20 7:18 ` LRN
2019-03-19 20:51 ` Brian Inglis
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