Date: Tue, 25 Oct 2016 16:50:10 +0000 (UTC) From: Gleb Smirnoff <glebius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r307930 - releng/11.0/sys/boot/geli Message-ID: <201610251650.u9PGoAAc064968@repo.freebsd.org>
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Author: glebius Date: Tue Oct 25 16:50:10 2016 New Revision: 307930 URL: https://svnweb.freebsd.org/changeset/base/307930 Log: EN-16:18: loader may hang during boot A programming error in GELIBoot causes the loader to attempt to read past the end of the disk if the size of the final partition is not a multiple of 4 kB. Merge r306834 from stable/11. Approved by: so Modified: releng/11.0/sys/boot/geli/geliboot.c Directory Properties: releng/11.0/ (props changed) Modified: releng/11.0/sys/boot/geli/geliboot.c ============================================================================== --- releng/11.0/sys/boot/geli/geliboot.c Tue Oct 25 16:45:55 2016 (r307929) +++ releng/11.0/sys/boot/geli/geliboot.c Tue Oct 25 16:50:10 2016 (r307930) @@ -77,17 +77,25 @@ geli_taste(int read_func(void *vdev, voi int error; off_t alignsector; - alignsector = (lastsector * DEV_BSIZE) & - ~(off_t)(DEV_GELIBOOT_BSIZE - 1); + alignsector = rounddown2(lastsector * DEV_BSIZE, DEV_GELIBOOT_BSIZE); + if (alignsector + DEV_GELIBOOT_BSIZE > ((lastsector + 1) * DEV_BSIZE)) { + /* Don't read past the end of the disk */ + alignsector = (lastsector * DEV_BSIZE) + DEV_BSIZE + - DEV_GELIBOOT_BSIZE; + } error = read_func(NULL, dskp, alignsector, &buf, DEV_GELIBOOT_BSIZE); if (error != 0) { return (error); } - /* Extract the last DEV_BSIZE bytes from the block. */ - error = eli_metadata_decode(buf + (DEV_GELIBOOT_BSIZE - DEV_BSIZE), - &md); + /* Extract the last 4k sector of the disk. */ + error = eli_metadata_decode(buf, &md); if (error != 0) { - return (error); + /* Try the last 512 byte sector instead. */ + error = eli_metadata_decode(buf + + (DEV_GELIBOOT_BSIZE - DEV_BSIZE), &md); + if (error != 0) { + return (error); + } } if (!(md.md_flags & G_ELI_FLAG_GELIBOOT)) {
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