Linux v4.10-rc7-65-g926af627
This commit is contained in:
Justin M. Forbes
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8b1b41ee74f9712c355d66dc105bbea663ae0afd
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926af6273fc683cd98cd0ce7bf0d04a02eed6742
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@ -1,91 +0,0 @@
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From 7892032cfe67f4bde6fc2ee967e45a8fbaf33756 Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Sat, 4 Feb 2017 23:18:55 -0800
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Subject: ip6_gre: fix ip6gre_err() invalid reads
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Andrey Konovalov reported out of bound accesses in ip6gre_err()
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If GRE flags contains GRE_KEY, the following expression
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*(((__be32 *)p) + (grehlen / 4) - 1)
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accesses data ~40 bytes after the expected point, since
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grehlen includes the size of IPv6 headers.
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Let's use a "struct gre_base_hdr *greh" pointer to make this
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code more readable.
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p[1] becomes greh->protocol.
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grhlen is the GRE header length.
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Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv6/ip6_gre.c | 40 +++++++++++++++++++++-------------------
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1 file changed, 21 insertions(+), 19 deletions(-)
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diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
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index 5586318..630b73b 100644
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--- a/net/ipv6/ip6_gre.c
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+++ b/net/ipv6/ip6_gre.c
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@@ -367,35 +367,37 @@ static void ip6gre_tunnel_uninit(struct net_device *dev)
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static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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- u8 type, u8 code, int offset, __be32 info)
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+ u8 type, u8 code, int offset, __be32 info)
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{
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- const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
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- __be16 *p = (__be16 *)(skb->data + offset);
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- int grehlen = offset + 4;
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+ const struct gre_base_hdr *greh;
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+ const struct ipv6hdr *ipv6h;
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+ int grehlen = sizeof(*greh);
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struct ip6_tnl *t;
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+ int key_off = 0;
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__be16 flags;
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+ __be32 key;
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- flags = p[0];
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- if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
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- if (flags&(GRE_VERSION|GRE_ROUTING))
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- return;
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- if (flags&GRE_KEY) {
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- grehlen += 4;
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- if (flags&GRE_CSUM)
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- grehlen += 4;
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- }
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+ if (!pskb_may_pull(skb, offset + grehlen))
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+ return;
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+ greh = (const struct gre_base_hdr *)(skb->data + offset);
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+ flags = greh->flags;
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+ if (flags & (GRE_VERSION | GRE_ROUTING))
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+ return;
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+ if (flags & GRE_CSUM)
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+ grehlen += 4;
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+ if (flags & GRE_KEY) {
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+ key_off = grehlen + offset;
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+ grehlen += 4;
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}
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- /* If only 8 bytes returned, keyed message will be dropped here */
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- if (!pskb_may_pull(skb, grehlen))
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+ if (!pskb_may_pull(skb, offset + grehlen))
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return;
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ipv6h = (const struct ipv6hdr *)skb->data;
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- p = (__be16 *)(skb->data + offset);
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+ greh = (const struct gre_base_hdr *)(skb->data + offset);
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+ key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
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t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
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- flags & GRE_KEY ?
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- *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
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- p[1]);
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+ key, greh->protocol);
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if (!t)
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return;
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--
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cgit v0.12
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@ -69,7 +69,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%global rcrev 7
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# The git snapshot level
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%define gitrev 1
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%define gitrev 2
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# Set rpm version accordingly
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%define rpmversion 4.%{upstream_sublevel}.0
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%endif
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@ -599,10 +599,6 @@ Patch853: 0001-Work-around-for-gcc7-and-arm64.patch
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#CVE-2017-2596 rhbz 1417812 1417813
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Patch854: kvm-fix-page-struct-leak-in-handle_vmon.patch
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#CVE-2017-5897 rhbz 1419848 1419851
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Patch855: ip6_gre-fix-ip6gre_err-invalid-reads.patch
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# END OF PATCH DEFINITIONS
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%endif
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@ -2173,6 +2169,9 @@ fi
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#
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#
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%changelog
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* Wed Feb 08 2017 Justin M. Forbes <jforbes@fedoraproject.org> - 4.10.0-0.rc7.git2.1
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- Linux v4.10-rc7-65-g926af627
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* Tue Feb 07 2017 Justin M. Forbes <jforbes@fedoraproject.org> - 4.10.0-0.rc7.git1.1
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- Linux v4.10-rc7-29-g8b1b41e
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- Reenable debugging options.
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2
sources
2
sources
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@ -1,4 +1,4 @@
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SHA512 (linux-4.9.tar.xz) = bf67ff812cc3cb7e5059e82cc5db0d9a7c5637f7ed9a42e4730c715bf7047c81ed3a571225f92a33ef0b6d65f35595bc32d773356646df2627da55e9bc7f1f1a
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SHA512 (perf-man-4.9.tar.gz) = d23bb3da1eadd6623fddbf4696948de7675f3dcf57c711a7427dd7ae111394f58d8f42752938bbea7cd219f1e7f6f116fc67a1c74f769711063940a065f37b99
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SHA512 (patch-4.10-rc7.xz) = 206e5e97581bb376141398b6962fbbc4ee0a58b50fae1de83f3f6f3c06502b260f006628aab738d63994a6d1c0276717d49e882a8107b8f9c24d565a2a70ea9b
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SHA512 (patch-4.10-rc7-git1.xz) = 6b71afe5c9bd79e551bcd26798284ce1d77359e8787a1861d2acfeaec7222abf08dd0bf92c842c0fa790271dbcce42c895d50b805e0a868525c8d73ff425d3b1
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SHA512 (patch-4.10-rc7-git2.xz) = eab140627e4d14eabe40b69c34e50418fa9ec5602506e2a5d80b92de11b182ef86378df64461770767e667ac0045d988ca3c22d7509786088e4bd9945d0eb233
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