| 2015-08-31 00:15:30 |
Michael Hudson-Doyle |
bug |
|
|
added bug |
| 2015-09-10 10:13:24 |
Michael Hudson-Doyle |
description |
Go shared libraries depend on -Bsymbolic-functions working, which unfortunately doesn't in the version of binutils on trusty. The fix is in binutils-2_24-branch: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=cd3813a8c9e59ccba0c42f5e3664465428e0e89c so could this be uploaded to trusty please? (I guess I should make this into a formal SRU request...) |
There is a bug in the version ld.bfd in trusty on arm64, where even if
you pass -Bsymbolic-functions to ld, function pointer values are still
subject to interposition by other shared objects. This was fixed and
backported to the binutils-2_24 branch in January 2015.
[Impact]
Shared libraries for Go depend on -Bsymbolic-functions working
properly and while it's unlikely that we'll ever support a version of
Go on trusty that supports shared libraries, the arm64 builders for
Go's build dashboard are trusty machines and so I can't run the shared
library tests by default until this is fixed in trusty.
It's also extremely confusing to debug the problems this causes.
The bug existed on 32-bit ARM too, but there is a workaround: use gold
instead (which does not have this bug). That doesn't apply to arm64 as
there is no arm64 gold in trusty.
[Test Case]
$ cat shared.h
typedef int (*intfunc)(void);
int interpos(void);
intfunc getintfunc(void);
$ cat shared.c
#include <stdio.h>
#include "shared.h"
int interpos(void) {
return 0;
}
intfunc intfuncs[] = { interpos };
intfunc
getintfunc(void) {
return intfuncs[0];
}
void
callinterpos(void) {
printf("calling interpos directly says %d\n", interpos());
}
$ cat main.c
#include <stdio.h>
#include "shared.h"
int interpos(void) {
return 1;
}
int main(int argc, char** argv) {
callinterpos();
printf("calling interpos via pointer says %d\n", getintfunc()());
}
$ gcc -shared -Wl,-Bsymbolic-functions -o libshared.so shared.c
$ gcc -o main main.c ./libshared.so
$ ./main
calling interpos directly says 0
calling interpos via pointer says 1
The two values printed should be the same.
[Regression Potential]
It is ever so slightly possible that some package depends on the
broken behaviour, but that seems pretty unlikely given that this
behaviour does not occur on intel platforms. |
|
| 2015-09-10 10:25:15 |
Michael Hudson-Doyle |
attachment added |
|
binutils_2.24-5ubuntu13_2.24-5-ubuntu14.diff https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/1490352/+attachment/4460452/+files/binutils_2.24-5ubuntu13_2.24-5-ubuntu14.diff |
|
| 2015-09-10 11:02:09 |
Matthias Klose |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2015-09-10 16:29:15 |
C de-Avillez |
nominated for series |
|
Ubuntu Trusty |
|
| 2015-09-10 16:29:15 |
C de-Avillez |
bug task added |
|
binutils (Ubuntu Trusty) |
|
| 2015-09-16 14:24:19 |
Matthias Klose |
bug task added |
|
binutils-arm64-cross (Ubuntu) |
|
| 2015-09-16 14:24:32 |
Matthias Klose |
bug task deleted |
binutils-arm64-cross (Ubuntu) |
|
|
| 2015-09-16 14:24:45 |
Matthias Klose |
bug task deleted |
binutils (Ubuntu) |
|
|
| 2015-09-16 15:58:05 |
Chris J Arges |
binutils (Ubuntu Trusty): status |
New |
Fix Committed |
|
| 2015-09-16 15:58:08 |
Chris J Arges |
bug |
|
|
added subscriber SRU Verification |
| 2015-09-16 15:58:11 |
Chris J Arges |
tags |
|
verification-needed |
|
| 2015-09-17 00:09:47 |
Michael Hudson-Doyle |
tags |
verification-needed |
verification-done |
|
| 2015-09-17 18:44:46 |
Brian Murray |
binutils-arm64-cross (Ubuntu Trusty): status |
New |
Fix Committed |
|
| 2015-09-17 18:44:51 |
Brian Murray |
tags |
verification-done |
|
|
| 2015-09-17 18:44:52 |
Brian Murray |
tags |
|
verification-needed |
|
| 2015-09-17 18:57:50 |
Launchpad Janitor |
branch linked |
|
lp:ubuntu/trusty-proposed/binutils-arm64-cross |
|
| 2015-09-17 20:12:45 |
Michael Hudson-Doyle |
tags |
verification-needed |
verification-done |
|
| 2015-09-23 19:00:50 |
Launchpad Janitor |
binutils (Ubuntu Trusty): status |
Fix Committed |
Fix Released |
|
| 2015-09-23 19:00:54 |
Chris J Arges |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2015-09-30 00:08:21 |
Launchpad Janitor |
binutils-arm64-cross (Ubuntu Trusty): status |
Fix Committed |
Fix Released |
|
