Bug#177351: marked as done (libc6: calling semctl(2) causes process to seg Fault on PowerPC)
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and subject line Bug#177351: libc6: calling semctl(2) causes process to seg Fault on PowerPC
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From: Isaac Jurado Peinado <etanol@mnm.uib.es>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6: calling semctl(2) causes process to seg Fault on PowerPC
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Package: libc6
Version: 2.3.1-9
Severity: normal
If you call semctl(2) after sucessfully creating a new semaphore set
with semget(2) it produces a Segmentation Fault on PowerPC. Sample
code:
int create_mutex(key_t clave)
{
int mutex;
mutex = semget(clave, 1, IPC_CREAT|IPC_EXCL|0640);
if (mutex == -1)
mutex = semget(clave, 1, 0);
else
if (semctl(mutex, 0, SETVAL, 1) == -1)
throw_an_error();
return mutex;
}
It works on i386 with the same version.
-- System Information:
Debian Release: testing/unstable
Architecture: ppc
Kernel: Linux butterfly 2.4.20-ben1 #2 vie ene 3 17:15:31 CET 2003 ppc
Locale: LANG=es_ES@euro, LC_CTYPE=es_ES@euro
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
-- no debconf information
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Date: Sat, 18 Jan 2003 20:09:46 -0500
From: Daniel Jacobowitz <dan@debian.org>
To: Isaac Jurado Peinado <etanol@mnm.uib.es>, 177351-done@bugs.debian.org
Subject: Re: Bug#177351: libc6: calling semctl(2) causes process to seg Fault on PowerPC
Message-ID: <20030119010946.GA27725@nevyn.them.org>
References: <[🔎] 20030119002650.58A3510931@botijo>
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On Sun, Jan 19, 2003 at 01:26:49AM +0100, Isaac Jurado Peinado wrote:
> Package: libc6
> Version: 2.3.1-9
> Severity: normal
>
> If you call semctl(2) after sucessfully creating a new semaphore set
> with semget(2) it produces a Segmentation Fault on PowerPC. Sample
> code:
>
> int create_mutex(key_t clave)
> {
> int mutex;
>
> mutex = semget(clave, 1, IPC_CREAT|IPC_EXCL|0640);
> if (mutex == -1)
> mutex = semget(clave, 1, 0);
> else
> if (semctl(mutex, 0, SETVAL, 1) == -1)
> throw_an_error();
> return mutex;
> }
>
> It works on i386 with the same version.
This is a bug in your code. The fourth argument to semctl is a "union
semun", never an integer; on PowerPC this changes the calling
convention. See the man page for semctl(2).
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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