Resolves: #1983278 - ospfd crashes in route_node_delete with assertion fail
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Michal Ruprich
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60a5f4164e
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31b2cc24c1
108
0007-ospfd-crash.patch
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108
0007-ospfd-crash.patch
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From 4f08c715db6893ff439d0a39bf4506cd26256d13 Mon Sep 17 00:00:00 2001
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From: Igor Ryzhov <iryzhov@nfware.com>
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Date: Fri, 18 Jun 2021 13:06:13 +0300
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Subject: [PATCH] lib: remove pure attribute from functions that modify memory
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Almost all functions currently marked with pure attribute acquire a
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route_node lock. By marking them pure we allow compiler to optimize the
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code and not call them when it already knows the return value. This is
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completely incorrect.
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Only two of eleven functions can be marked as pure. And they still won't
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be optimized because they are never called from the same function twice.
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Let's remove the ext_pure macro completely to reduce the chance of
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repeating this mistake in the future.
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Fixes #8866, #8809, #8595, #6992.
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Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
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---
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lib/compiler.h | 9 ---------
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lib/table.h | 44 ++++++++++++++++++++------------------------
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2 files changed, 20 insertions(+), 33 deletions(-)
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diff --git a/lib/compiler.h b/lib/compiler.h
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index bbfe01b569c..e805eb8be48 100644
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--- a/lib/compiler.h
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+++ b/lib/compiler.h
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@@ -123,15 +123,6 @@ extern "C" {
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#define assume(x)
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#endif
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-/* pure = function does not modify memory & return value is the same if
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- * memory hasn't changed (=> allows compiler to optimize)
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- *
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- * Mostly autodetected by the compiler if function body is available (i.e.
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- * static inline functions in headers). Since that implies it should only be
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- * used in headers for non-inline functions, the "extern" is included here.
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- */
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-#define ext_pure extern __attribute__((pure))
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-
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/* for helper functions defined inside macros */
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#define macro_inline static inline __attribute__((unused))
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#define macro_pure static inline __attribute__((unused, pure))
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diff --git a/lib/table.h b/lib/table.h
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index 7e383dce808..5dec69ee7ea 100644
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--- a/lib/table.h
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+++ b/lib/table.h
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@@ -197,29 +197,25 @@ static inline void route_table_set_info(struct route_table *table, void *d)
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table->info = d;
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}
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-/* ext_pure => extern __attribute__((pure))
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- * does not modify memory (but depends on mem), allows compiler to optimize
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- */
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-
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extern void route_table_finish(struct route_table *table);
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-ext_pure struct route_node *route_top(struct route_table *table);
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-ext_pure struct route_node *route_next(struct route_node *node);
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-ext_pure struct route_node *route_next_until(struct route_node *node,
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- const struct route_node *limit);
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+extern struct route_node *route_top(struct route_table *table);
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+extern struct route_node *route_next(struct route_node *node);
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+extern struct route_node *route_next_until(struct route_node *node,
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+ const struct route_node *limit);
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extern struct route_node *route_node_get(struct route_table *table,
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union prefixconstptr pu);
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-ext_pure struct route_node *route_node_lookup(struct route_table *table,
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- union prefixconstptr pu);
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-ext_pure struct route_node *route_node_lookup_maynull(struct route_table *table,
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- union prefixconstptr pu);
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-ext_pure struct route_node *route_node_match(struct route_table *table,
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- union prefixconstptr pu);
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-ext_pure struct route_node *route_node_match_ipv4(struct route_table *table,
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- const struct in_addr *addr);
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-ext_pure struct route_node *route_node_match_ipv6(struct route_table *table,
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- const struct in6_addr *addr);
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-
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-ext_pure unsigned long route_table_count(struct route_table *table);
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+extern struct route_node *route_node_lookup(struct route_table *table,
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+ union prefixconstptr pu);
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+extern struct route_node *route_node_lookup_maynull(struct route_table *table,
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+ union prefixconstptr pu);
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+extern struct route_node *route_node_match(struct route_table *table,
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+ union prefixconstptr pu);
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+extern struct route_node *route_node_match_ipv4(struct route_table *table,
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+ const struct in_addr *addr);
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+extern struct route_node *route_node_match_ipv6(struct route_table *table,
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+ const struct in6_addr *addr);
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+
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+extern unsigned long route_table_count(struct route_table *table);
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extern struct route_node *route_node_create(route_table_delegate_t *delegate,
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struct route_table *table);
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@@ -228,10 +224,10 @@ extern void route_node_destroy(route_table_delegate_t *delegate,
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struct route_table *table,
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struct route_node *node);
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-ext_pure struct route_node *route_table_get_next(struct route_table *table,
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- union prefixconstptr pu);
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-ext_pure int route_table_prefix_iter_cmp(const struct prefix *p1,
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- const struct prefix *p2);
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+extern struct route_node *route_table_get_next(struct route_table *table,
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+ union prefixconstptr pu);
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+extern int route_table_prefix_iter_cmp(const struct prefix *p1,
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+ const struct prefix *p2);
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/*
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* Iterator functions.
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6
frr.spec
6
frr.spec
@ -5,7 +5,7 @@
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Name: frr
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Version: 7.5.1
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Release: 6%{?dist}
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Release: 7%{?dist}
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Summary: Routing daemon
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License: GPLv2+
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URL: http://www.frrouting.org
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@ -20,6 +20,7 @@ Patch0003: 0003-disable-eigrp-crypto.patch
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Patch0004: 0004-fips-mode.patch
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Patch0005: 0005-icc-options.patch
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Patch0006: 0006-move-to-libexec.patch
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Patch0007: 0007-ospfd-crash.patch
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BuildRequires: autoconf
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BuildRequires: automake
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@ -203,6 +204,9 @@ fi
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%{_sysusersdir}/%{name}.conf
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%changelog
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* Tue Jul 20 2021 Michal Ruprich <mruprich@redhat.com> - 7.5.1-7
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- Resolves: #1983278 - ospfd crashes in route_node_delete with assertion fail
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* Sat Jul 10 2021 Björn Esser <besser82@fedoraproject.org> - 7.5.1-6
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- Rebuild for versioned symbols in json-c
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