Date: Mon, 24 Nov 2014 01:25:19 +0000 (UTC) From: Peter Grehan <grehan@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r274942 - stable/10/sys/boot/common Message-ID: <201411240125.sAO1PJkd008067@svn.freebsd.org>
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Author: grehan Date: Mon Nov 24 01:25:19 2014 New Revision: 274942 URL: https://svnweb.freebsd.org/changeset/base/274942 Log: MFC r274407 Fix incorrect reading of 32-bit modinfo by 64-bit loaders. The various structures in the mod_metadata set of a FreeBSD kernel and modules contain pointers. The FreeBSD loader correctly deals with a mismatch in loader and kernel pointer size (e.g. 32-bit i386/ppc loader, loading 64-bit amd64/ppc64 kernels), but wasn't dealing with the inverse case where a 64-bit loader was loading a 32-bit kernel. Modified: stable/10/sys/boot/common/load_elf.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/boot/common/load_elf.c ============================================================================== --- stable/10/sys/boot/common/load_elf.c Mon Nov 24 01:13:58 2014 (r274941) +++ stable/10/sys/boot/common/load_elf.c Mon Nov 24 01:25:19 2014 (r274942) @@ -610,6 +610,14 @@ struct mod_metadata64 { u_int64_t md_cval; /* common string label */ }; #endif +#if defined(__amd64__) && __ELF_WORD_SIZE == 32 +struct mod_metadata32 { + int md_version; /* structure version MDTV_* */ + int md_type; /* type of entry MDT_* */ + u_int32_t md_data; /* specific data */ + u_int32_t md_cval; /* common string label */ +}; +#endif int __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef) @@ -617,6 +625,8 @@ __elfN(parse_modmetadata)(struct preload struct mod_metadata md; #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 struct mod_metadata64 md64; +#elif defined(__amd64__) && __ELF_WORD_SIZE == 32 + struct mod_metadata32 md32; #endif struct mod_depend *mdepend; struct mod_version mver; @@ -652,6 +662,18 @@ __elfN(parse_modmetadata)(struct preload md.md_type = md64.md_type; md.md_cval = (const char *)(uintptr_t)md64.md_cval; md.md_data = (void *)(uintptr_t)md64.md_data; +#elif defined(__amd64__) && __ELF_WORD_SIZE == 32 + COPYOUT(v, &md32, sizeof(md32)); + error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32)); + if (error == EOPNOTSUPP) { + md32.md_cval += ef->off; + md32.md_data += ef->off; + } else if (error != 0) + return (error); + md.md_version = md32.md_version; + md.md_type = md32.md_type; + md.md_cval = (const char *)(uintptr_t)md32.md_cval; + md.md_data = (void *)(uintptr_t)md32.md_data; #else COPYOUT(v, &md, sizeof(md)); error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md));
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