From 105e6e93a2b556560d0275bd5ceb29751de28469 Mon Sep 17 00:00:00 2001 From: "mwilck@arcor.de" Date: Tue, 24 Sep 2013 19:18:52 +0200 Subject: [PATCH] DDF: add_to_super_ddf: be careful with workspace_lba Some vendor DDF structures interpret workspace_lba very differently then us. Make a sanity check on the value before using it for config_size. Signed-off-by: Martin Wilck Signed-off-by: NeilBrown --- super-ddf.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) --- mdadm-3.3.orig/super-ddf.c +++ mdadm-3.3/super-ddf.c @@ -2704,6 +2704,31 @@ static unsigned int find_unused_pde(cons return DDF_NOTFOUND; } +static void _set_config_size(struct phys_disk_entry *pde, const struct dl *dl) +{ + __u64 cfs, t; + cfs = min(dl->size - 32*1024*2ULL, be64_to_cpu(dl->primary_lba)); + t = be64_to_cpu(dl->secondary_lba); + if (t != ~(__u64)0) + cfs = min(cfs, t); + /* + * Some vendor DDF structures interpret workspace_lba + * very differently then us. Make a sanity check on the value. + */ + t = be64_to_cpu(dl->workspace_lba); + if (t < cfs) { + __u64 wsp = cfs - t; + if (wsp > 1024*1024*2ULL && wsp > dl->size / 16) { + pr_err("%s: %x:%x: workspace size 0x%llx too big, ignoring\n", + __func__, dl->major, dl->minor, wsp); + } else + cfs = t; + } + pde->config_size = cpu_to_be64(cfs); + dprintf("%s: %x:%x config_size %llx, DDF structure is %llx blocks\n", + __func__, dl->major, dl->minor, cfs, dl->size-cfs); +} + /* add a device to a container, either while creating it or while * expanding a pre-existing container */ @@ -2826,7 +2851,7 @@ static int add_to_super_ddf(struct super if (ddf->dlist == NULL || be64_to_cpu(ddf->dlist->secondary_lba) != ~(__u64)0) __calc_lba(dd, ddf->dlist, secondary_lba, 32); - pde->config_size = dd->workspace_lba; + _set_config_size(pde, dd); sprintf(pde->path, "%17.17s","Information: nil") ; memset(pde->pad, 0xff, 6);