diff options
| author | Kenneth R Westerback <krw@cvs.openbsd.org> | 2014-04-27 13:41:51 +0000 |
|---|---|---|
| committer | Kenneth R Westerback <krw@cvs.openbsd.org> | 2014-04-27 13:41:51 +0000 |
| commit | 434d8596bfd54c7371efcbd2b1b8dee514ff4800 (patch) | |
| tree | 9af1f848eb523ef9d61cd75d7544c7c5340c6598 /usr.sbin/installboot/i386_installboot.c | |
| parent | 02214cf404d93d1fd99c350af6a580660b958551 (diff) | |
Don't zap disklabel (and next 6 blocks) when installing boot block on
4k-sector disk drives.
Noted and fix tested by David Vasek via misc@
tweaks & ok jsing@
Diffstat (limited to 'usr.sbin/installboot/i386_installboot.c')
| -rw-r--r-- | usr.sbin/installboot/i386_installboot.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/usr.sbin/installboot/i386_installboot.c b/usr.sbin/installboot/i386_installboot.c index 2a0d188cd29..fff16853700 100644 --- a/usr.sbin/installboot/i386_installboot.c +++ b/usr.sbin/installboot/i386_installboot.c @@ -1,4 +1,4 @@ -/* $OpenBSD: i386_installboot.c,v 1.1 2014/01/19 02:58:50 jsing Exp $ */ +/* $OpenBSD: i386_installboot.c,v 1.2 2014/04/27 13:41:50 krw Exp $ */ /* $NetBSD: installboot.c,v 1.5 1995/11/17 23:23:50 gwr Exp $ */ /* @@ -190,9 +190,13 @@ write_bootblocks(int devfd, char *dev, struct disklabel *dl) if (!nowrite) { if (lseek(devfd, (off_t)start * dl->d_secsize, SEEK_SET) < 0) - err(1, "seek bootstrap"); + err(1, "seek boot sector"); secbuf = calloc(1, dl->d_secsize); + if (read(devfd, secbuf, dl->d_secsize) != dl->d_secsize) + err(1, "read boot sector"); bcopy(blkstore, secbuf, blksize); + if (lseek(devfd, (off_t)start * dl->d_secsize, SEEK_SET) < 0) + err(1, "seek bootstrap"); if (write(devfd, secbuf, dl->d_secsize) != dl->d_secsize) err(1, "write bootstrap"); free(secbuf); |