/* * security/tomoyo/memory.c * * Copyright (C) 2005-2011 NTT DATA CORPORATION */ #include #include #include "common.h" /** * tomoyo_warn_oom - Print out of memory warning message. * * @function: Function's name. */ void tomoyo_warn_oom(const char *function) { /* Reduce error messages. */ static pid_t tomoyo_last_pid; const pid_t pid = current->pid; if (tomoyo_last_pid != pid) { printk(KERN_WARNING "ERROR: Out of memory at %s.\n", function); tomoyo_last_pid = pid; } if (!tomoyo_policy_loaded) panic("MAC Initialization failed.\n"); } /* Memoy currently used by policy/audit log/query. */ unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT]; /* Memory quota for "policy"/"audit log"/"query". */ unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT]; /** * tomoyo_memory_ok - Check memory quota. * * @ptr: Pointer to allocated memory. * * Returns true on success, false otherwise. * * Returns true if @ptr is not NULL and quota not exceeded, false otherwise. * * Caller holds tomoyo_policy_lock mutex. */ bool tomoyo_memory_ok(void *ptr) { if (ptr) { const size_t s = ksize(ptr); tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s; if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] || tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <= tomoyo_memory_quota[TOMOYO_MEMORY_POLICY]) return true; tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s; } tomoyo_warn_oom(__func__); return false; } /** * tomoyo_commit_ok - Check memory quota. * * @data: Data to copy from. * @size: Size in byte. * * Returns pointer to allocated memory on success, NULL otherwise. * @data is zero-cleared on success. * * Caller holds tomoyo_policy_lock mutex. */ void *tomoyo_commit_ok(void *data, const unsigned int size) { void *ptr = kzalloc(size, GFP_NOFS); if (tomoyo_memory_ok(ptr)) { memmove(ptr, data, size); memset(data, 0, size); return ptr; } kfree(ptr); return NULL; } /** * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group". * * @param: Pointer to "struct tomoyo_acl_param". * @idx: Index number. * * Returns pointer to "struct tomoyo_group" on success, NULL otherwise. */ struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param, const u8 idx) { struct tomoyo_group e = { }; struct tomoyo_group *group = NULL; struct list_head *list; const char *group_name = tomoyo_read_token(param); bool found = false; if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP) return NULL; e.group_name = tomoyo_get_name(group_name); if (!e.group_name) return NULL; if (mutex_lock_interruptible(&tomoyo_policy_lock)) goto out; list = ¶m->ns->group_list[idx]; list_for_each_entry(group, list, head.list) { if (e.group_name != group->group_name || atomic_read(&group->head.users) == TOMOYO_GC_IN_PROGRESS) continue; atomic_inc(&group->head.users); found = true; break; } if (!found) { struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e)); if (entry) { INIT_LIST_HEAD(&entry->member_list); atomic_set(&entry->head.users, 1); list_add_tail_rcu(&entry->head.list, list); group = entry; found = true; } } mutex_unlock(&tomoyo_policy_lock); out: tomoyo_put_name(e.group_name); return found ? group : NULL; } /* * tomoyo_name_list is used for holding string data used by TOMOYO. * Since same string data is likely used for multiple times (e.g. * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of * "const struct tomoyo_path_info *". */ struct list_head tomoyo_name_list[TOMOYO_MAX_HASH]; /** * tomoyo_get_name - Allocate permanent memory for string data. * * @name: The string to store into the permernent memory. * * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. */ const struct tomoyo_path_info *tomoyo_get_name(const char *name) { struct tomoyo_name *ptr; unsigned int hash; int len; struct list_head *head; if (!name) return NULL; len = strlen(name) + 1; hash = full_name_hash(NULL, (const unsigned char *) name, len - 1); head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)]; if (mutex_lock_interruptible(&tomoyo_policy_lock)) return NULL; list_for_each_entry(ptr, head, head.list) { if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) || atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS) continue; atomic_inc(&ptr->head.users); goto out; } ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS); if (tomoyo_memory_ok(ptr)) { ptr->entry.name = ((char *) ptr) + sizeof(*ptr); memmove((char *) ptr->entry.name, name, len); atomic_set(&ptr->head.users, 1); tomoyo_fill_path_info(&ptr->entry); list_add_tail(&ptr->head.list, head); } else { kfree(ptr); ptr = NULL; } out: mutex_unlock(&tomoyo_policy_lock); return ptr ? &ptr->entry : NULL; } /* Initial namespace.*/ struct tomoyo_policy_namespace tomoyo_kernel_namespace; /** * tomoyo_mm_init - Initialize mm related code. */ void __init tomoyo_mm_init(void) { int idx; for (idx = 0; idx < TOMOYO_MAX_HASH; idx++) INIT_LIST_HEAD(&tomoyo_name_list[idx]); tomoyo_kernel_namespace.name = ""; tomoyo_init_policy_namespace(&tomoyo_kernel_namespace); tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace; INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list); tomoyo_kernel_domain.domainname = tomoyo_get_name(""); list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list); } th>be6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /net/mac80211/rate.c parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/mac80211/rate.c')