1 /* $OpenBSD: loadfile_subr.c,v 1.3 2013/03/21 21:50:59 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 2010 Miodrag Vallat.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/param.h>
20 #include <sys/systm.h>
21 #include <lib/libkern/libkern.h>
22
23 #include <sys/exec_elf.h>
24 #include <lib/libsa/loadfile.h>
25
26 #include <machine/alpha_cpu.h>
27 #include <machine/rpb.h>
28
29 #define ptoa(a) ((a) << PAGE_SHIFT)
30
31 /*
32 * Prevent loading a kernel if it would overlap the SRM.
33 */
34 int
check_phdr(void * hdr)35 check_phdr(void *hdr)
36 {
37 Elf64_Phdr *phdr = (Elf64_Phdr *)hdr;
38 struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
39 struct mddt *mddtp;
40 struct mddt_cluster *memc;
41 u_int64_t cstart, cend;
42 u_int64_t i;
43
44 mddtp = (struct mddt *)(((caddr_t)hwrpb) + hwrpb->rpb_memdat_off);
45 for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
46 memc = &mddtp->mddt_clusters[i];
47 if (memc->mddt_usage & MDDT_PALCODE) {
48 cstart = ALPHA_PHYS_TO_K0SEG(ptoa(memc->mddt_pfn));
49 cend = cstart + ptoa(memc->mddt_pg_cnt);
50
51 if (phdr->p_vaddr + phdr->p_memsz <= cstart ||
52 phdr->p_vaddr >= cend)
53 continue;
54
55 printf("SRM console and kernel image would overlap.\n"
56 "Please report this to <alpha@openbsd.org>, "
57 "with the following values:\n"
58 "SRM range: %p-%p\n"
59 "kernel range: %p-%p\n",
60 cstart, cend, phdr->p_vaddr,
61 phdr->p_vaddr + phdr->p_memsz);
62 return 1;
63 }
64 }
65
66 return 0;
67 }
68