Your message dated Tue, 20 Sep 2016 22:15:11 +0000
with message-id <e1bmtjn-0005qy...@franck.debian.org>
and subject line Bug#838316: Removed package(s) from unstable
has caused the Debian Bug report #751812,
regarding Incorrect fortify warning with -flto
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
751812: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751812
Debian Bug Tracking System
Contact ow...@bugs.debian.org with problems
--- Begin Message ---
Package: gcc-4.9
Version: 4.9.0-6
$ cat t.c
#define _FORTIFY_SOURCE 2
#include <stdio.h>
#include <limits.h>
long long size;
void execute(void) {
unsigned char input[4096];
size_t bytes = (size > (ssize_t)sizeof input
? sizeof input
: size);
size_t bytesRead = fread(input, 1, bytes, stdin);
}
int main(int argc, char **argv) {
size = LLONG_MAX;
execute();
return 0;
}
$ gcc-4.9 -O2 t.c
$ gcc-4.9 -O2 -flto t.c
In function ‘__fread_alias’,
inlined from ‘execute’ at t.c:12:10:
/usr/include/i386-linux-gnu/bits/stdio2.h:290:2: warning: call to
‘__fread_chk_warn’ declared with attribute warning: fread called with
bigger size * nmemb than length of destination buffer
return __fread_chk (__ptr, __bos0 (__ptr), __size, __n, __stream);
^
richard@deodand:~/src/vbig$ dpkg -l libc6-dev gcc-4.9
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii gcc-4.9 4.9.0-6 i386 GNU C compiler
ii libc6-dev:i386 2.19-1 i386 Embedded GNU C Library:
Developme
The relevant portion of stdio2.h is:
266 extern size_t __fread_chk (void *__restrict __ptr, size_t __ptrlen,
267 size_t __size, size_t __n,
268 FILE *__restrict __stream) __wur;
269 extern size_t __REDIRECT (__fread_alias,
270 (void *__restrict __ptr, size_t __size,
271 size_t __n, FILE *__restrict __stream),
272 fread) __wur;
273 extern size_t __REDIRECT (__fread_chk_warn,
274 (void *__restrict __ptr, size_t __ptrlen,
275 size_t __size, size_t __n,
276 FILE *__restrict __stream),
277 __fread_chk)
278 __wur __warnattr ("fread called with bigger size * nmemb
than length "
279 "of destination buffer");
280
281 __fortify_function __wur size_t
282 fread (void *__restrict __ptr, size_t __size, size_t __n,
283 FILE *__restrict __stream)
284 {
285 if (__bos0 (__ptr) != (size_t) -1)
286 {
287 if (!__builtin_constant_p (__size)
288 || !__builtin_constant_p (__n)
289 || (__size | __n) >= (((size_t) 1) << (8 * sizeof
(size_t) / 2)))
290 return __fread_chk (__ptr, __bos0 (__ptr), __size, __n,
__stream);
291
292 if (__size * __n > __bos0 (__ptr))
293 return __fread_chk_warn (__ptr, __bos0 (__ptr), __size,
__n, __stream);
294 }
295 return __fread_alias (__ptr, __size, __n, __stream);
296 }
The warning attribute is attached to __fread_chk_warn (called line 293)
but the warning is issued against line 290 where __fread_chk is called -
so the compiler has got confused about these two functions?
ttfn/rjk
--- End Message ---
--- Begin Message ---
Version: 4.9.4-2+rm
Dear submitter,
as the package gcc-4.9 has just been removed from the Debian archive
unstable we hereby close the associated bug reports. We are sorry
that we couldn't deal with your issue properly.
For details on the removal, please see https://bugs.debian.org/838316
The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.
This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmas...@ftp-master.debian.org.
Debian distribution maintenance software
pp.
Chris Lamb (the ftpmaster behind the curtain)
--- End Message ---
