From: Ulrich Drepper <drepper@redhat.com>
Date: Wed, 21 May 1997 00:05:52 +0000 (+0000)
Subject: (shmat): For Linux-2.0 and up the kernel can return negative values.
X-Git-Tag: cvs/libc-2_0_4~58
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=caf512f51a699944ae2407325bc7ad6b7ecca11c;p=thirdparty%2Fglibc.git

(shmat): For Linux-2.0 and up the kernel can return negative values.
Only fail when return value is in range in range which is never
returned as valid address.
---

diff --git a/sysdeps/unix/sysv/linux/shmat.c b/sysdeps/unix/sysv/linux/shmat.c
index 2ac07f21d05..070b00c30f7 100644
--- a/sysdeps/unix/sysv/linux/shmat.c
+++ b/sysdeps/unix/sysv/linux/shmat.c
@@ -33,5 +33,6 @@ shmat (shmid, shmaddr, shmflg)
   unsigned long raddr;
 
   retval = __ipc (IPCOP_shmat, shmid, shmflg, (int) &raddr, shmaddr);
-  return retval < 0 ? (void *) retval : (void *) raddr;
+  return ((unsigned long int) retval > -(unsigned long int) SHMLBA
+	  ? (void *) retval : (void *) raddr);
 }