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SubjectPatch to sys_shmdt
Date
	Currently sys_shmdt() always returns success.  Below is a patch that changes
this behavior to match the man page. This patch will cause sys_shmdt() to
return success only when it finds something to detach, and returns EINVAL
otherwise. The patch was run on a 2.4.10 kernel tree, but applies against a 2.4.12
tree with no problems.


--- linux-2.4.10old/ipc/shm.c Fri Oct 5 11:53:12 2001
+++ linux-2.4.10/ipc/shm.c Fri Oct 5 15:08:51 2001
@@ -649,16 +649,19 @@
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *shmd, *shmdnext;
+ int retcode=-EINVAL;

down_write(&mm->mmap_sem);
for (shmd = mm->mmap; shmd; shmd = shmdnext) {
shmdnext = shmd->vm_next;
if (shmd->vm_ops == &shm_vm_ops
- && shmd->vm_start - (shmd->vm_pgoff << PAGE_SHIFT) == (ulong) shmaddr)
+ && shmd->vm_start - (shmd->vm_pgoff << PAGE_SHIFT) == (ulong) shmaddr) {
do_munmap(mm, shmd->vm_start, shmd->vm_end - shmd->vm_start);
+ retcode=0;
+ }
}
up_write(&mm->mmap_sem);
- return 0;
+ return retcode;
}

#ifdef CONFIG_PROC_FS

Adam Bottchen
bottchen@earthlink.net
-
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