tmpfs: Refuse sizes that overflow round_page.
Reported-by: syzbot+8dbeee84de15f86df65b@syzkaller.appspotmail.com https://syzkaller.appspot.com/bug?id=4a27b9fe074f8d4b0afbe22969339b8dfdb157e8
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@ -1,4 +1,4 @@
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/* $NetBSD: tmpfs_subr.c,v 1.115 2023/04/29 06:29:55 riastradh Exp $ */
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/* $NetBSD: tmpfs_subr.c,v 1.116 2023/04/29 08:13:27 riastradh Exp $ */
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/*
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* Copyright (c) 2005-2020 The NetBSD Foundation, Inc.
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@ -73,7 +73,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tmpfs_subr.c,v 1.115 2023/04/29 06:29:55 riastradh Exp $");
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__KERNEL_RCSID(0, "$NetBSD: tmpfs_subr.c,v 1.116 2023/04/29 08:13:27 riastradh Exp $");
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#include <sys/param.h>
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#include <sys/cprng.h>
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@ -907,6 +907,9 @@ tmpfs_reg_resize(struct vnode *vp, off_t newsize)
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KASSERT(vp->v_type == VREG);
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KASSERT(newsize >= 0);
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if (newsize > __type_max(off_t) - PAGE_SIZE + 1)
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return EFBIG;
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oldsize = node->tn_size;
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oldpages = round_page(oldsize) >> PAGE_SHIFT;
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newpages = round_page(newsize) >> PAGE_SHIFT;
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