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Lock VM Giant prior to locking a vm map.

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Spotted by:	Daniel Rock <D.Rock@t-online.de>
Tested by:	David Wolfskill <david@catwhisker.org>,
		Sean Eric Fagan <sef@kithrup.com>
This commit is contained in:
tanimura 2001-06-06 04:13:11 +00:00
parent 7a4f835060
commit f16ee52380
1 changed files with 7 additions and 0 deletions
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7
sys/fs/procfs/procfs_map.c
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@ -87,6 +87,8 @@ procfs_domap(curp, p, pfs, uio)
if (uio->uio_offset != 0)
return (0);
mtx_lock(&vm_mtx);
error = 0;
if (map != &curproc->p_vmspace->vm_map)
vm_map_lock_read(map);
@ -169,12 +171,17 @@ case OBJT_DEVICE:
error = EFBIG;
break;
}
mtx_unlock(&vm_mtx);
error = uiomove(mebuffer, len, uio);
mtx_lock(&vm_mtx);
if (error)
break;
}
if (map != &curproc->p_vmspace->vm_map)
vm_map_unlock_read(map);
mtx_unlock(&vm_mtx);
return error;
}