diff options
Diffstat (limited to 'debian/patches-rt/0288-net-xfrm-Use-sequence-counter-with-associated-spinlo.patch')
| -rw-r--r-- | debian/patches-rt/0288-net-xfrm-Use-sequence-counter-with-associated-spinlo.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/debian/patches-rt/0288-net-xfrm-Use-sequence-counter-with-associated-spinlo.patch b/debian/patches-rt/0288-net-xfrm-Use-sequence-counter-with-associated-spinlo.patch new file mode 100644 index 000000000..df8a062a3 --- /dev/null +++ b/debian/patches-rt/0288-net-xfrm-Use-sequence-counter-with-associated-spinlo.patch @@ -0,0 +1,43 @@ +From 97138dbb6886695284b96e3680f1533beae6e43a Mon Sep 17 00:00:00 2001 +From: "Ahmed S. Darwish" <a.darwish@linutronix.de> +Date: Tue, 16 Mar 2021 11:56:30 +0100 +Subject: [PATCH 288/323] net: xfrm: Use sequence counter with associated + spinlock +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +A sequence counter write section must be serialized or its internal +state can get corrupted. A plain seqcount_t does not contain the +information of which lock must be held to guaranteee write side +serialization. + +For xfrm_state_hash_generation, use seqcount_spinlock_t instead of plain +seqcount_t. This allows to associate the spinlock used for write +serialization with the sequence counter. It thus enables lockdep to +verify that the write serialization lock is indeed held before entering +the sequence counter write section. + +If lockdep is disabled, this lock association is compiled out and has +neither storage size nor runtime overhead. + +Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> +Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> +--- + include/net/netns/xfrm.h | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h +index 7b87da22b295..fef22e029c0d 100644 +--- a/include/net/netns/xfrm.h ++++ b/include/net/netns/xfrm.h +@@ -77,7 +77,7 @@ struct netns_xfrm { + struct dst_ops xfrm6_dst_ops; + #endif + spinlock_t xfrm_state_lock; +- seqcount_t xfrm_state_hash_generation; ++ seqcount_spinlock_t xfrm_state_hash_generation; + seqcount_spinlock_t xfrm_policy_hash_generation; + + spinlock_t xfrm_policy_lock; +-- +2.43.0 + |