Conf: Fixes bug in symbol lookup during reconfiguration
Symbol lookup by cf_find_symbol() not only did the lookup but also added new void symbols allocated from cfg_mem linpool, which gets broken when lookups are done outside of config parsing, which may lead to crashes during reconfiguration. The patch separates lookup-only cf_find_symbol() and config-modifying cf_get_symbol(), while the later is called only during parsing. Also new_config and cfg_mem global variables are NULLed outside of parsing.
This commit is contained in:
Ondrej Zajicek (work)
parent
3aed0a6ff7
commit
9b9a7143c4
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@ -70,7 +70,7 @@ struct sym_scope {
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static struct sym_scope *conf_this_scope;
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static int cf_hash(byte *c);
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static struct symbol *cf_find_sym(byte *c, unsigned int h0);
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static inline struct symbol * cf_get_sym(byte *c, uint h0);
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linpool *cfg_mem;
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@ -194,7 +194,7 @@ else: {
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}
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k=k->next;
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}
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cf_lval.s = cf_find_sym(yytext, h);
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cf_lval.s = cf_get_sym(yytext, h);
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return SYM;
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}
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@ -426,8 +426,9 @@ check_eof(void)
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}
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static struct symbol *
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cf_new_sym(byte *c, unsigned int h)
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cf_new_sym(byte *c, uint h0)
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{
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uint h = h0 & (SYM_HASH_SIZE-1);
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struct symbol *s, **ht;
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int l;
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@ -449,56 +450,77 @@ cf_new_sym(byte *c, unsigned int h)
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}
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static struct symbol *
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cf_find_sym(byte *c, unsigned int h0)
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cf_find_sym(struct config *cfg, byte *c, uint h0)
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{
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unsigned int h = h0 & (SYM_HASH_SIZE-1);
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uint h = h0 & (SYM_HASH_SIZE-1);
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struct symbol *s, **ht;
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if (ht = new_config->sym_hash)
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if (ht = cfg->sym_hash)
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{
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for(s = ht[h]; s; s=s->next)
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if (!strcmp(s->name, c) && s->scope->active)
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return s;
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}
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if (new_config->sym_fallback)
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if (ht = cfg->sym_fallback)
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{
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/* We know only top-level scope is active */
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for(s = new_config->sym_fallback[h]; s; s=s->next)
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for(s = ht[h]; s; s=s->next)
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if (!strcmp(s->name, c) && s->scope->active)
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return s;
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}
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return cf_new_sym(c, h);
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return NULL;
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}
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static inline struct symbol *
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cf_get_sym(byte *c, uint h0)
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{
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return cf_find_sym(new_config, c, h0) ?: cf_new_sym(c, h0);
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}
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/**
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* cf_find_symbol - find a symbol by name
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* @cfg: specificed config
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* @c: symbol name
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*
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* This functions searches the symbol table for a symbol of given
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* name. First it examines the current scope, then the second recent
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* one and so on until it either finds the symbol and returns a pointer
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* to its &symbol structure or reaches the end of the scope chain
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* and returns %NULL to signify no match.
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* This functions searches the symbol table in the config @cfg for a symbol of
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* given name. First it examines the current scope, then the second recent one
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* and so on until it either finds the symbol and returns a pointer to its
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* &symbol structure or reaches the end of the scope chain and returns %NULL to
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* signify no match.
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*/
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struct symbol *
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cf_find_symbol(byte *c)
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cf_find_symbol(struct config *cfg, byte *c)
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{
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return cf_find_sym(c, cf_hash(c));
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return cf_find_sym(cfg, c, cf_hash(c));
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}
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/**
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* cf_get_symbol - get a symbol by name
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* @c: symbol name
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*
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* This functions searches the symbol table of the currently parsed config
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* (@new_config) for a symbol of given name. It returns either the already
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* existing symbol or a newly allocated undefined (%SYM_VOID) symbol if no
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* existing symbol is found.
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*/
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struct symbol *
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cf_get_symbol(byte *c)
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{
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return cf_get_sym(c, cf_hash(c));
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}
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struct symbol *
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cf_default_name(char *template, int *counter)
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{
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char buf[32];
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char buf[SYM_MAX_LEN];
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struct symbol *s;
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char *perc = strchr(template, '%');
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for(;;)
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{
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bsprintf(buf, template, ++(*counter));
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s = cf_find_sym(buf, cf_hash(buf));
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if (!s)
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break;
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s = cf_get_sym(buf, cf_hash(buf));
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if (s->class == SYM_VOID)
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return s;
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if (!perc)
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@ -529,7 +551,7 @@ cf_define_symbol(struct symbol *sym, int type, void *def)
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{
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if (sym->scope == conf_this_scope)
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cf_error("Symbol already defined");
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sym = cf_new_sym(sym->name, cf_hash(sym->name) & (SYM_HASH_SIZE-1));
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sym = cf_new_sym(sym->name, cf_hash(sym->name));
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}
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sym->class = type;
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sym->def = def;
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65
conf/conf.c
65
conf/conf.c
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@ -20,19 +20,19 @@
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*
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* There can exist up to four different configurations at one time: an active
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* one (pointed to by @config), configuration we are just switching from
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* (@old_config), one queued for the next reconfiguration (@future_config;
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* if there is one and the user wants to reconfigure once again, we just
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* free the previous queued config and replace it with the new one) and
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* finally a config being parsed (@new_config). The stored @old_config
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* is also used for undo reconfiguration, which works in a similar way.
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* Reconfiguration could also have timeout (using @config_timer) and undo
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* is automatically called if the new configuration is not confirmed later.
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* (@old_config), one queued for the next reconfiguration (@future_config; if
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* there is one and the user wants to reconfigure once again, we just free the
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* previous queued config and replace it with the new one) and finally a config
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* being parsed (@new_config). The stored @old_config is also used for undo
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* reconfiguration, which works in a similar way. Reconfiguration could also
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* have timeout (using @config_timer) and undo is automatically called if the
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* new configuration is not confirmed later. The new config (@new_config) and
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* associated linear pool (@cfg_mem) is non-NULL only during parsing.
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*
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* Loading of new configuration is very simple: just call config_alloc()
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* to get a new &config structure, then use config_parse() to parse a
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* configuration file and fill all fields of the structure
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* and finally ask the config manager to switch to the new
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* config by calling config_commit().
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* Loading of new configuration is very simple: just call config_alloc() to get
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* a new &config structure, then use config_parse() to parse a configuration
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* file and fill all fields of the structure and finally ask the config manager
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* to switch to the new config by calling config_commit().
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*
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* CLI commands are parsed in a very similar way -- there is also a stripped-down
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* &config structure associated with them and they are lex-ed and parsed by the
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@ -91,10 +91,15 @@ config_alloc(byte *name)
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linpool *l = lp_new(p, 4080);
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struct config *c = lp_allocz(l, sizeof(struct config));
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/* Duplication of name string in local linear pool */
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uint nlen = strlen(name) + 1;
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char *ndup = lp_allocu(l, nlen);
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memcpy(ndup, name, nlen);
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c->mrtdump_file = -1; /* Hack, this should be sysdep-specific */
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c->pool = p;
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cfg_mem = c->mem = l;
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c->file_name = cfg_strdup(name);
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c->mem = l;
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c->file_name = ndup;
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c->load_time = now;
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c->tf_route = c->tf_proto = (struct timeformat){"%T", "%F", 20*3600};
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c->tf_base = c->tf_log = (struct timeformat){"%F %T", NULL, 0};
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@ -119,11 +124,13 @@ config_alloc(byte *name)
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int
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config_parse(struct config *c)
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{
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int done = 0;
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DBG("Parsing configuration file `%s'\n", c->file_name);
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new_config = c;
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cfg_mem = c->mem;
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if (setjmp(conf_jmpbuf))
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return 0;
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goto cleanup;
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cf_lex_init(0, c);
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sysdep_preconfig(c);
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protos_preconfig(c);
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@ -137,7 +144,12 @@ config_parse(struct config *c)
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if (!c->router_id)
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cf_error("Router ID must be configured manually on IPv6 routers");
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#endif
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return 1;
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done = 1;
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cleanup:
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new_config = NULL;
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cfg_mem = NULL;
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return done;
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}
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/**
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@ -150,14 +162,22 @@ config_parse(struct config *c)
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int
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cli_parse(struct config *c)
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{
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new_config = c;
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int done = 0;
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c->sym_fallback = config->sym_hash;
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new_config = c;
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cfg_mem = c->mem;
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if (setjmp(conf_jmpbuf))
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return 0;
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goto cleanup;
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cf_lex_init(1, c);
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cf_parse();
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return 1;
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done = 1;
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cleanup:
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c->sym_fallback = NULL;
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new_config = NULL;
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cfg_mem = NULL;
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return done;
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}
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/**
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@ -237,10 +257,6 @@ config_do_commit(struct config *c, int type)
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if (old_config && !config->shutdown)
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log(L_INFO "Reconfiguring");
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/* This should not be necessary, but it seems there are some
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functions that access new_config instead of config */
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new_config = config;
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if (old_config)
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old_config->obstacle_count++;
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@ -254,9 +270,6 @@ config_do_commit(struct config *c, int type)
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DBG("protos_commit\n");
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protos_commit(c, old_config, force_restart, type);
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/* Just to be sure nobody uses that now */
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new_config = NULL;
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int obs = 0;
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if (old_config)
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obs = --old_config->obstacle_count;
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@ -147,7 +147,9 @@ int cf_lex(void);
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void cf_lex_init(int is_cli, struct config *c);
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void cf_lex_unwind(void);
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struct symbol *cf_find_symbol(byte *c);
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struct symbol *cf_find_symbol(struct config *cfg, byte *c);
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struct symbol *cf_get_symbol(byte *c);
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struct symbol *cf_default_name(char *template, int *counter);
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struct symbol *cf_define_symbol(struct symbol *symbol, int type, void *def);
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void cf_push_scope(struct symbol *);
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@ -521,7 +521,7 @@ protos_commit(struct config *new, struct config *old, int force_reconfig, int ty
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WALK_LIST(oc, old->protos)
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{
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p = oc->proto;
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sym = cf_find_symbol(oc->name);
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sym = cf_find_symbol(new, oc->name);
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if (sym && sym->class == SYM_PROTO && !new->shutdown)
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{
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/* Found match, let's check if we can smoothly switch to new configuration */
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@ -311,7 +311,7 @@ roa_commit(struct config *new, struct config *old)
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if (old)
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WALK_LIST(t, roa_table_list)
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{
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struct symbol *sym = cf_find_symbol(t->name);
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struct symbol *sym = cf_find_symbol(new, t->name);
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if (sym && sym->class == SYM_ROA)
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{
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/* Found old table in new config */
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@ -1663,7 +1663,7 @@ rt_prune_loop(void)
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void
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rt_preconfig(struct config *c)
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{
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struct symbol *s = cf_find_symbol("master");
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struct symbol *s = cf_get_symbol("master");
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init_list(&c->tables);
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c->master_rtc = rt_new_table(s);
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@ -1903,7 +1903,7 @@ rt_commit(struct config *new, struct config *old)
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rtable *ot = o->table;
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if (!ot->deleted)
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{
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struct symbol *sym = cf_find_symbol(o->name);
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struct symbol *sym = cf_find_symbol(new, o->name);
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if (sym && sym->class == SYM_TABLE && !new->shutdown)
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{
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DBG("\t%s: same\n", o->name);
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@ -96,7 +96,7 @@ drop_gid(gid_t gid)
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static inline void
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add_num_const(char *name, int val)
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{
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struct symbol *s = cf_find_symbol(name);
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struct symbol *s = cf_get_symbol(name);
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s->class = SYM_CONSTANT | T_INT;
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s->def = cfg_allocz(sizeof(struct f_val));
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SYM_TYPE(s) = T_INT;
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