* Re: [PATCH v2] vringh: Fix loop descriptors check in the indirect cases [not found] <20220505100910.137-1-xieyongji@bytedance.com> @ 2022-05-10 7:43 ` Jason Wang [not found] ` <CACycT3uakPB_JeXb11hrBaPjcdqign3FmuQd3FXgFR7orO_Eaw@mail.gmail.com> 0 siblings, 1 reply; 3+ messages in thread From: Jason Wang @ 2022-05-10 7:43 UTC (permalink / raw) To: Xie Yongji; +Cc: fam.zheng, rusty, virtualization, kvm, mst On Thu, May 5, 2022 at 6:08 PM Xie Yongji <xieyongji@bytedance.com> wrote: > > We should use size of descriptor chain to test loop condition > in the indirect case. And another statistical count is also introduced > for indirect descriptors to avoid conflict with the statistical count > of direct descriptors. > > Fixes: f87d0fbb5798 ("vringh: host-side implementation of virtio rings.") > Signed-off-by: Xie Yongji <xieyongji@bytedance.com> > Signed-off-by: Fam Zheng <fam.zheng@bytedance.com> > --- > drivers/vhost/vringh.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c > index 14e2043d7685..eab55accf381 100644 > --- a/drivers/vhost/vringh.c > +++ b/drivers/vhost/vringh.c > @@ -292,7 +292,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > int (*copy)(const struct vringh *vrh, > void *dst, const void *src, size_t len)) > { > - int err, count = 0, up_next, desc_max; > + int err, count = 0, indirect_count = 0, up_next, desc_max; > struct vring_desc desc, *descs; > struct vringh_range range = { -1ULL, 0 }, slowrange; > bool slow = false; > @@ -349,7 +349,12 @@ __vringh_iov(struct vringh *vrh, u16 i, > continue; > } > > - if (count++ == vrh->vring.num) { > + if (up_next == -1) > + count++; > + else > + indirect_count++; > + > + if (count > vrh->vring.num || indirect_count > desc_max) { > vringh_bad("Descriptor loop in %p", descs); > err = -ELOOP; > goto fail; > @@ -411,6 +416,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > i = return_from_indirect(vrh, &up_next, > &descs, &desc_max); > slow = false; > + indirect_count = 0; Do we need to reset up_next to -1 here? Thanks > } else > break; > } > -- > 2.20.1 > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <CACycT3uakPB_JeXb11hrBaPjcdqign3FmuQd3FXgFR7orO_Eaw@mail.gmail.com>]
* Re: [PATCH v2] vringh: Fix loop descriptors check in the indirect cases [not found] ` <CACycT3uakPB_JeXb11hrBaPjcdqign3FmuQd3FXgFR7orO_Eaw@mail.gmail.com> @ 2022-05-10 7:56 ` Jason Wang [not found] ` <CACycT3v8bo=6YHmb-F3fEjVSCsJdWSLwLy4RTz6hCW39FAZZPA@mail.gmail.com> 0 siblings, 1 reply; 3+ messages in thread From: Jason Wang @ 2022-05-10 7:56 UTC (permalink / raw) To: Yongji Xie; +Cc: fam.zheng, rusty, virtualization, kvm, mst On Tue, May 10, 2022 at 3:54 PM Yongji Xie <xieyongji@bytedance.com> wrote: > > On Tue, May 10, 2022 at 3:44 PM Jason Wang <jasowang@redhat.com> wrote: > > > > On Thu, May 5, 2022 at 6:08 PM Xie Yongji <xieyongji@bytedance.com> wrote: > > > > > > We should use size of descriptor chain to test loop condition > > > in the indirect case. And another statistical count is also introduced > > > for indirect descriptors to avoid conflict with the statistical count > > > of direct descriptors. > > > > > > Fixes: f87d0fbb5798 ("vringh: host-side implementation of virtio rings.") > > > Signed-off-by: Xie Yongji <xieyongji@bytedance.com> > > > Signed-off-by: Fam Zheng <fam.zheng@bytedance.com> > > > --- > > > drivers/vhost/vringh.c | 10 ++++++++-- > > > 1 file changed, 8 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c > > > index 14e2043d7685..eab55accf381 100644 > > > --- a/drivers/vhost/vringh.c > > > +++ b/drivers/vhost/vringh.c > > > @@ -292,7 +292,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > int (*copy)(const struct vringh *vrh, > > > void *dst, const void *src, size_t len)) > > > { > > > - int err, count = 0, up_next, desc_max; > > > + int err, count = 0, indirect_count = 0, up_next, desc_max; > > > struct vring_desc desc, *descs; > > > struct vringh_range range = { -1ULL, 0 }, slowrange; > > > bool slow = false; > > > @@ -349,7 +349,12 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > continue; > > > } > > > > > > - if (count++ == vrh->vring.num) { > > > + if (up_next == -1) > > > + count++; > > > + else > > > + indirect_count++; > > > + > > > + if (count > vrh->vring.num || indirect_count > desc_max) { > > > vringh_bad("Descriptor loop in %p", descs); > > > err = -ELOOP; > > > goto fail; > > > @@ -411,6 +416,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > i = return_from_indirect(vrh, &up_next, > > > &descs, &desc_max); > > > slow = false; > > > + indirect_count = 0; > > > > Do we need to reset up_next to -1 here? > > > > It will be reset to -1 in return_from_indirect(). Right. Then Acked-by: Jason Wang <jasowang@redhat.com> Thanks > > Thanks, > Yongji > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <CACycT3v8bo=6YHmb-F3fEjVSCsJdWSLwLy4RTz6hCW39FAZZPA@mail.gmail.com>]
* Re: [PATCH v2] vringh: Fix loop descriptors check in the indirect cases [not found] ` <CACycT3v8bo=6YHmb-F3fEjVSCsJdWSLwLy4RTz6hCW39FAZZPA@mail.gmail.com> @ 2022-06-02 9:51 ` Michael S. Tsirkin 0 siblings, 0 replies; 3+ messages in thread From: Michael S. Tsirkin @ 2022-06-02 9:51 UTC (permalink / raw) To: Yongji Xie; +Cc: fam.zheng, rusty, kvm, virtualization On Thu, Jun 02, 2022 at 12:55:50PM +0800, Yongji Xie wrote: > Ping. Thanks for the reminder! Will queue for rc2, rc1 has too much stuff already. > On Tue, May 10, 2022 at 3:56 PM Jason Wang <jasowang@redhat.com> wrote: > > > > On Tue, May 10, 2022 at 3:54 PM Yongji Xie <xieyongji@bytedance.com> wrote: > > > > > > On Tue, May 10, 2022 at 3:44 PM Jason Wang <jasowang@redhat.com> wrote: > > > > > > > > On Thu, May 5, 2022 at 6:08 PM Xie Yongji <xieyongji@bytedance.com> wrote: > > > > > > > > > > We should use size of descriptor chain to test loop condition > > > > > in the indirect case. And another statistical count is also introduced > > > > > for indirect descriptors to avoid conflict with the statistical count > > > > > of direct descriptors. > > > > > > > > > > Fixes: f87d0fbb5798 ("vringh: host-side implementation of virtio rings.") > > > > > Signed-off-by: Xie Yongji <xieyongji@bytedance.com> > > > > > Signed-off-by: Fam Zheng <fam.zheng@bytedance.com> > > > > > --- > > > > > drivers/vhost/vringh.c | 10 ++++++++-- > > > > > 1 file changed, 8 insertions(+), 2 deletions(-) > > > > > > > > > > diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c > > > > > index 14e2043d7685..eab55accf381 100644 > > > > > --- a/drivers/vhost/vringh.c > > > > > +++ b/drivers/vhost/vringh.c > > > > > @@ -292,7 +292,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > > > int (*copy)(const struct vringh *vrh, > > > > > void *dst, const void *src, size_t len)) > > > > > { > > > > > - int err, count = 0, up_next, desc_max; > > > > > + int err, count = 0, indirect_count = 0, up_next, desc_max; > > > > > struct vring_desc desc, *descs; > > > > > struct vringh_range range = { -1ULL, 0 }, slowrange; > > > > > bool slow = false; > > > > > @@ -349,7 +349,12 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > > > continue; > > > > > } > > > > > > > > > > - if (count++ == vrh->vring.num) { > > > > > + if (up_next == -1) > > > > > + count++; > > > > > + else > > > > > + indirect_count++; > > > > > + > > > > > + if (count > vrh->vring.num || indirect_count > desc_max) { > > > > > vringh_bad("Descriptor loop in %p", descs); > > > > > err = -ELOOP; > > > > > goto fail; > > > > > @@ -411,6 +416,7 @@ __vringh_iov(struct vringh *vrh, u16 i, > > > > > i = return_from_indirect(vrh, &up_next, > > > > > &descs, &desc_max); > > > > > slow = false; > > > > > + indirect_count = 0; > > > > > > > > Do we need to reset up_next to -1 here? > > > > > > > > > > It will be reset to -1 in return_from_indirect(). > > > > Right. Then > > > > Acked-by: Jason Wang <jasowang@redhat.com> > > > > Thanks > > > > > > > > Thanks, > > > Yongji > > > > > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization ^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-05-10 7:43 ` [PATCH v2] vringh: Fix loop descriptors check in the indirect cases Jason Wang
[not found] ` <CACycT3uakPB_JeXb11hrBaPjcdqign3FmuQd3FXgFR7orO_Eaw@mail.gmail.com>
2022-05-10 7:56 ` Jason Wang
[not found] ` <CACycT3v8bo=6YHmb-F3fEjVSCsJdWSLwLy4RTz6hCW39FAZZPA@mail.gmail.com>
2022-06-02 9:51 ` Michael S. Tsirkin
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