BMC/Intel-BMC/linux.git/net/core/skbuff.c, branch dev-4.10

net: adjust skb->truesize in ___pskb_trim()

2017-05-14T12:08:28+00:00

[ Upstream commit c21b48cc1bbf2f5af3ef54ada559f7fadf8b508b ] Andrey found a way to trigger the WARN_ON_ONCE(delta < len) in skb_try_coalesce() using syzkaller and a filter attached to a TCP socket. As we did recently in commit 158f323b9868 ("net: adjust skb->truesize in pskb_expand_head()") we can adjust skb->truesize from ___pskb_trim(), via a call to skb_condense(). If all frags were freed, then skb->truesize can be recomputed. This call can be done if skb is not yet owned, or destructor is sock_edemux(). Signed-off-by: Eric Dumazet Reported-by: Andrey Konovalov Cc: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

tcp: mark skbs with SCM_TIMESTAMPING_OPT_STATS

2017-05-03T15:37:41+00:00

[ Upstream commit 4ef1b2869447411ad3ef91ad7d4891a83c1a509a ] SOF_TIMESTAMPING_OPT_STATS can be enabled and disabled while packets are collected on the error queue. So, checking SOF_TIMESTAMPING_OPT_STATS in sk->sk_tsflags is not enough to safely assume that the skb contains OPT_STATS data. Add a bit in sock_exterr_skb to indicate whether the skb contains opt_stats data. Fixes: 1c885808e456 ("tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING") Reported-by: JongHwan Kim Signed-off-by: Soheil Hassas Yeganeh Signed-off-by: Eric Dumazet Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

tcp: fix SCM_TIMESTAMPING_OPT_STATS for normal skbs

2017-05-03T15:37:41+00:00

[ Upstream commit 8605330aac5a5785630aec8f64378a54891937cc ] __sock_recv_timestamp can be called for both normal skbs (for receive timestamps) and for skbs on the error queue (for transmit timestamps). Commit 1c885808e456 (tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING) assumes any skb passed to __sock_recv_timestamp are from the error queue, containing OPT_STATS in the content of the skb. This results in accessing invalid memory or generating junk data. To fix this, set skb->pkt_type to PACKET_OUTGOING for packets on the error queue. This is safe because on the receive path on local sockets skb->pkt_type is never set to PACKET_OUTGOING. With that, copy OPT_STATS from a packet, only if its pkt_type is PACKET_OUTGOING. Fixes: 1c885808e456 ("tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING") Reported-by: JongHwan Kim Signed-off-by: Soheil Hassas Yeganeh Signed-off-by: Eric Dumazet Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

gso: Validate assumption of frag_list segementation

2017-05-03T15:37:40+00:00

[ Upstream commit 43170c4e0ba709c79130c3fe5a41e66279950cd0 ] Commit 07b26c9454a2 ("gso: Support partial splitting at the frag_list pointer") assumes that all SKBs in a frag_list (except maybe the last one) contain the same amount of GSO payload. This assumption is not always correct, resulting in the following warning message in the log: skb_segment: too many frags For example, mlx5 driver in Striding RQ mode creates some RX SKBs with one frag, and some with 2 frags. After GRO, the frag_list SKBs end up having different amounts of payload. If this frag_list SKB is then forwarded, the aforementioned assumption is violated. Validate the assumption, and fall back to software GSO if it not true. Change-Id: Ia03983f4a47b6534dd987d7a2aad96d54d46d212 Fixes: 07b26c9454a2 ("gso: Support partial splitting at the frag_list pointer") Signed-off-by: Ilan Tayari Signed-off-by: Ilya Lesokhin Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

net-timestamp: avoid use-after-free in ip_recv_error

2017-05-03T15:37:40+00:00

[ Upstream commit 1862d6208db0aeca9c8ace44915b08d5ab2cd667 ] Syzkaller reported a use-after-free in ip_recv_error at line info->ipi_ifindex = skb->dev->ifindex; This function is called on dequeue from the error queue, at which point the device pointer may no longer be valid. Save ifindex on enqueue in __skb_complete_tx_timestamp, when the pointer is valid or NULL. Store it in temporary storage skb->cb. It is safe to reference skb->dev here, as called from device drivers or dev_queue_xmit. The exception is when called from tcp_ack_tstamp; in that case it is NULL and ifindex is set to 0 (invalid). Do not return a pktinfo cmsg if ifindex is 0. This maintains the current behavior of not returning a cmsg if skb->dev was NULL. On dequeue, the ipv4 path will cast from sock_exterr_skb to in_pktinfo. Both have ifindex as their first element, so no explicit conversion is needed. This is by design, introduced in commit 0b922b7a829c ("net: original ingress device index in PKTINFO"). For ipv6 ip6_datagram_support_cmsg converts to in6_pktinfo. Fixes: 829ae9d61165 ("net-timestamp: allow reading recv cmsg on errqueue with origin tstamp") Reported-by: Andrey Konovalov Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

net: fix socket refcounting in skb_complete_tx_timestamp()

2017-03-22T11:56:59+00:00

[ Upstream commit 9ac25fc063751379cb77434fef9f3b088cd3e2f7 ] TX skbs do not necessarily hold a reference on skb->sk->sk_refcnt By the time TX completion happens, sk_refcnt might be already 0. sock_hold()/sock_put() would then corrupt critical state, like sk_wmem_alloc and lead to leaks or use after free. Fixes: 62bccb8cdb69 ("net-timestamp: Make the clone operation stand-alone from phy timestamping") Signed-off-by: Eric Dumazet Cc: Alexander Duyck Cc: Johannes Berg Cc: Soheil Hassas Yeganeh Cc: Willem de Bruijn Acked-by: Soheil Hassas Yeganeh Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

net: fix socket refcounting in skb_complete_wifi_ack()

2017-03-22T11:56:59+00:00

[ Upstream commit dd4f10722aeb10f4f582948839f066bebe44e5fb ] TX skbs do not necessarily hold a reference on skb->sk->sk_refcnt By the time TX completion happens, sk_refcnt might be already 0. sock_hold()/sock_put() would then corrupt critical state, like sk_wmem_alloc. Fixes: bf7fa551e0ce ("mac80211: Resolve sk_refcnt/sk_wmem_alloc issue in wifi ack path") Signed-off-by: Eric Dumazet Cc: Alexander Duyck Cc: Johannes Berg Cc: Soheil Hassas Yeganeh Cc: Willem de Bruijn Acked-by: Soheil Hassas Yeganeh Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman

mm: rename __alloc_page_frag to page_frag_alloc and __free_page_frag to page_frag_free

2017-01-11T02:31:55+00:00

Patch series "Page fragment updates", v4. This patch series takes care of a few cleanups for the page fragments API. First we do some renames so that things are much more consistent. First we move the page_frag_ portion of the name to the front of the functions names. Secondly we split out the cache specific functions from the other page fragment functions by adding the word "cache" to the name. Finally I added a bit of documentation that will hopefully help to explain some of this. I plan to revisit this later as we get things more ironed out in the near future with the changes planned for the DMA setup to support eXpress Data Path. This patch (of 3): This patch renames the page frag functions to be more consistent with other APIs. Specifically we place the name page_frag first in the name and then have either an alloc or free call name that we append as the suffix. This makes it a bit clearer in terms of naming. In addition we drop the leading double underscores since we are technically no longer a backing interface and instead the front end that is called from the networking APIs. Link: http://lkml.kernel.org/r/20170104023854.13451.67390.stgit@localhost.localdomain Signed-off-by: Alexander Duyck Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

ktime: Get rid of the union

2016-12-25T16:21:22+00:00

ktime is a union because the initial implementation stored the time in scalar nanoseconds on 64 bit machine and in a endianess optimized timespec variant for 32bit machines. The Y2038 cleanup removed the timespec variant and switched everything to scalar nanoseconds. The union remained, but become completely pointless. Get rid of the union and just keep ktime_t as simple typedef of type s64. The conversion was done with coccinelle and some manual mopping up. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra

Replace with globally

2016-12-24T19:46:01+00:00

This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*' sed -i -e "s!$PATT!#include !" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro Signed-off-by: Linus Torvalds