Message ID | 20231027012033.50280-1-wangzhaolong1@huawei.com |
---|---|
State | New |
Headers | show |
Series | [v3] mtd: Fix gluebi NULL pointer dereference caused by ftl notifier | expand |
在 2023/10/27 9:20, ZhaoLong Wang 写道: > If both flt.ko and gluebi.ko are loaded, the notiier of ftl > triggers NULL pointer dereference when trying to access > ‘gluebi->desc’ in gluebi_read(). > > ubi_gluebi_init > ubi_register_volume_notifier > ubi_enumerate_volumes > ubi_notify_all > gluebi_notify nb->notifier_call() > gluebi_create > mtd_device_register > mtd_device_parse_register > add_mtd_device > blktrans_notify_add not->add() > ftl_add_mtd tr->add_mtd() > scan_header > mtd_read > mtd_read_oob > mtd_read_oob_std > gluebi_read mtd->read() > gluebi->desc - NULL > > Detailed reproduction information available at the link[1], > > The solution for the gluebi module is to run jffs2 on the UBI > volume without considering working with ftl or mtdblock.[2]. > Therefore, this problem can be avoided by preventing gluebi > from creating mtdblock devices. > > Fixes: 2ba3d76a1e29 ("UBI: make gluebi a separate module") > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217992 [1] > Link: https://lore.kernel.org/lkml/441107100.23734.1697904580252.JavaMail.zimbra@nod.at/ [2] > Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> > --- > drivers/mtd/mtd_blkdevs.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Hi ZhaoLong, wangzhaolong1@huawei.com wrote on Fri, 27 Oct 2023 09:20:33 +0800: > If both flt.ko and gluebi.ko are loaded, the notiier of ftl flt ? notifier > triggers NULL pointer dereference when trying to access > ‘gluebi->desc’ in gluebi_read(). > > ubi_gluebi_init > ubi_register_volume_notifier > ubi_enumerate_volumes > ubi_notify_all > gluebi_notify nb->notifier_call() > gluebi_create > mtd_device_register > mtd_device_parse_register > add_mtd_device > blktrans_notify_add not->add() > ftl_add_mtd tr->add_mtd() Glitches? > scan_header > mtd_read > mtd_read_oob > mtd_read_oob_std > gluebi_read mtd->read() > gluebi->desc - NULL > > Detailed reproduction information available at the link[1], > > The solution for the gluebi module is to run jffs2 on the UBI > volume without considering working with ftl or mtdblock.[2]. I am sorry but ftl, gluebi, mtdblock, jffs2 and ubi in the same report seem a little bit fuzzy. Are you sure about this sentence? > Therefore, this problem can be avoided by preventing gluebi > from creating mtdblock devices. This sentence sounds wrong :) > Fixes: 2ba3d76a1e29 ("UBI: make gluebi a separate module") > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217992 [1] > Link: https://lore.kernel.org/lkml/441107100.23734.1697904580252.JavaMail.zimbra@nod.at/ [2] > Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> > --- > drivers/mtd/mtd_blkdevs.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c > index ff18636e0889..5bc32108ca03 100644 > --- a/drivers/mtd/mtd_blkdevs.c > +++ b/drivers/mtd/mtd_blkdevs.c > @@ -463,7 +463,7 @@ static void blktrans_notify_add(struct mtd_info *mtd) > { > struct mtd_blktrans_ops *tr; > > - if (mtd->type == MTD_ABSENT) > + if (mtd->type == MTD_ABSENT || mtd->type == MTD_UBIVOLUME) > return; > > list_for_each_entry(tr, &blktrans_majors, list) > @@ -503,7 +503,7 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr) > mutex_lock(&mtd_table_mutex); > list_add(&tr->list, &blktrans_majors); > mtd_for_each_device(mtd) > - if (mtd->type != MTD_ABSENT) > + if (mtd->type != MTD_ABSENT && mtd->type != MTD_UBIVOLUME) > tr->add_mtd(tr, mtd); > mutex_unlock(&mtd_table_mutex); > return 0; Thanks, Miquèl
----- Ursprüngliche Mail ----- > Von: "Miquel Raynal" <miquel.raynal@bootlin.com> >> Detailed reproduction information available at the link[1], >> >> The solution for the gluebi module is to run jffs2 on the UBI >> volume without considering working with ftl or mtdblock.[2]. > > I am sorry but ftl, gluebi, mtdblock, jffs2 and ubi in the same report > seem a little bit fuzzy. Are you sure about this sentence? ZhaoLong Wang found an interesting bug while stacking various MTD components. I suggested to just deny mtdblock on top of gluebi to avoid the whole problem class instead of adding more duct tape. Thanks, //richard The issue reminds me of one of my favorite Monty Python sketches, https://www.youtube.com/watch?v=LFrdqQZ8FFc ;-)
Hi Richard, richard@nod.at wrote on Fri, 27 Oct 2023 22:30:10 +0200 (CEST): > ----- Ursprüngliche Mail ----- > > Von: "Miquel Raynal" <miquel.raynal@bootlin.com> > >> Detailed reproduction information available at the link[1], > >> > >> The solution for the gluebi module is to run jffs2 on the UBI > >> volume without considering working with ftl or mtdblock.[2]. > > > > I am sorry but ftl, gluebi, mtdblock, jffs2 and ubi in the same report > > seem a little bit fuzzy. Are you sure about this sentence? > > ZhaoLong Wang found an interesting bug while stacking various MTD components. > I suggested to just deny mtdblock on top of gluebi to avoid the whole > problem class instead of adding more duct tape. Ack. I'll queue this once the log fixed and your official Ack-by received for mtd/next after -rc1 is out. Thanks, Miquèl > > Thanks, > //richard > > The issue reminds me of one of my favorite Monty Python sketches, https://www.youtube.com/watch?v=LFrdqQZ8FFc > ;-) :-)
----- Ursprüngliche Mail ----- > Von: "Miquel Raynal" <miquel.raynal@bootlin.com> > Ack. I'll queue this once the log fixed and your official Ack-by > received for mtd/next after -rc1 is out. Acked-by: Richard Weinberger <richard@nod.at> Thanks, //richard
Friendly ping... I'd like to know what the current status of this patch is. Is there a need for further programme improvements? Bast regards, ZhaoLong Wang > ----- Ursprüngliche Mail ----- >> Von: "Miquel Raynal" <miquel.raynal@bootlin.com> >> Ack. I'll queue this once the log fixed and your official Ack-by >> received for mtd/next after -rc1 is out. > > Acked-by: Richard Weinberger <richard@nod.at> > > Thanks, > //richard >
Hi ZhaoLong, wangzhaolong1@huawei.com wrote on Tue, 19 Dec 2023 22:36:50 +0800: > Friendly ping... > > I'd like to know what the current status of this patch is. Is there a need for further programme improvements? Easy, see below. > > Bast regards, > ZhaoLong Wang > > > > ----- Ursprüngliche Mail ----- > >> Von: "Miquel Raynal" <miquel.raynal@bootlin.com> > >> Ack. I'll queue this once the log fixed and your official Ack-by > >> received for mtd/next after -rc1 is out. Here I depict two conditions. > > Acked-by: Richard Weinberger <richard@nod.at> And here one of them is fulfilled, which means the other one is still not AFAIK :) Thanks, Miquèl
Oh, sorry, I had missed a crucial part of your previous message, specifically the segment about the `flt ? notifier,This oversight led to my misunderstanding of the situation, and for that, I am truly sorry. Thank you for your understanding and patience. I am committed to maintaining clear and accurate communication going forward. I'll send a v4 version of the log fixed patch soon. Warmest thanks, ZhaoLong Wang > Hi ZhaoLong, > > wangzhaolong1@huawei.com wrote on Tue, 19 Dec 2023 22:36:50 +0800: > >> Friendly ping... >> >> I'd like to know what the current status of this patch is. Is there a need for further programme improvements? > > Easy, see below. > >> >> Bast regards, >> ZhaoLong Wang >> >> >>> ----- Ursprüngliche Mail ----- >>>> Von: "Miquel Raynal" <miquel.raynal@bootlin.com> >>>> Ack. I'll queue this once the log fixed and your official Ack-by >>>> received for mtd/next after -rc1 is out. > > Here I depict two conditions. > >>> Acked-by: Richard Weinberger <richard@nod.at> > > And here one of them is fulfilled, which means the other one is still > not AFAIK :) > > Thanks, > Miquèl
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index ff18636e0889..5bc32108ca03 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -463,7 +463,7 @@ static void blktrans_notify_add(struct mtd_info *mtd) { struct mtd_blktrans_ops *tr; - if (mtd->type == MTD_ABSENT) + if (mtd->type == MTD_ABSENT || mtd->type == MTD_UBIVOLUME) return; list_for_each_entry(tr, &blktrans_majors, list) @@ -503,7 +503,7 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr) mutex_lock(&mtd_table_mutex); list_add(&tr->list, &blktrans_majors); mtd_for_each_device(mtd) - if (mtd->type != MTD_ABSENT) + if (mtd->type != MTD_ABSENT && mtd->type != MTD_UBIVOLUME) tr->add_mtd(tr, mtd); mutex_unlock(&mtd_table_mutex); return 0;
If both flt.ko and gluebi.ko are loaded, the notiier of ftl triggers NULL pointer dereference when trying to access ‘gluebi->desc’ in gluebi_read(). ubi_gluebi_init ubi_register_volume_notifier ubi_enumerate_volumes ubi_notify_all gluebi_notify nb->notifier_call() gluebi_create mtd_device_register mtd_device_parse_register add_mtd_device blktrans_notify_add not->add() ftl_add_mtd tr->add_mtd() scan_header mtd_read mtd_read_oob mtd_read_oob_std gluebi_read mtd->read() gluebi->desc - NULL Detailed reproduction information available at the link[1], The solution for the gluebi module is to run jffs2 on the UBI volume without considering working with ftl or mtdblock.[2]. Therefore, this problem can be avoided by preventing gluebi from creating mtdblock devices. Fixes: 2ba3d76a1e29 ("UBI: make gluebi a separate module") Link: https://bugzilla.kernel.org/show_bug.cgi?id=217992 [1] Link: https://lore.kernel.org/lkml/441107100.23734.1697904580252.JavaMail.zimbra@nod.at/ [2] Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> --- drivers/mtd/mtd_blkdevs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)