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From 66b9f92ef41de90fc2b0359247c36bc6d128233d Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Fri, 28 Feb 2020 20:32:13 +0100
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Subject: [PATCH] nft: cache: Fix nft_release_cache() under stress
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iptables-nft-restore calls nft_action(h, NFT_COMPAT_COMMIT) for each
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COMMIT line in input. When restoring a dump containing multiple large
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tables, chances are nft_rebuild_cache() has to run multiple times.
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If the above happens, consecutive table contents are added to __cache[1]
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which nft_rebuild_cache() then frees, so next commit attempt accesses
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invalid memory.
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Fix this by making nft_release_cache() (called after each successful
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commit) return things into pre-rebuild state again, but keeping the
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fresh cache copy.
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Fixes: f6ad231d698c7 ("nft: keep original cache in case of ERESTART")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit c550c81fd373e5753103d20f7902171f0fa79807)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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iptables/nft-cache.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/iptables/nft-cache.c b/iptables/nft-cache.c
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index 7345a27e2894b..6f21f2283e0fb 100644
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--- a/iptables/nft-cache.c
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+++ b/iptables/nft-cache.c
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@@ -647,8 +647,14 @@ void nft_rebuild_cache(struct nft_handle *h)
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void nft_release_cache(struct nft_handle *h)
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{
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- if (h->cache_index)
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- flush_cache(h, &h->__cache[0], NULL);
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+ if (!h->cache_index)
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+ return;
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+
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+ flush_cache(h, &h->__cache[0], NULL);
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+ memcpy(&h->__cache[0], &h->__cache[1], sizeof(h->__cache[0]));
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+ memset(&h->__cache[1], 0, sizeof(h->__cache[1]));
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+ h->cache_index = 0;
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+ h->cache = &h->__cache[0];
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}
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struct nftnl_table_list *nftnl_table_list_get(struct nft_handle *h)
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--
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2.25.1
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