#ifndef XMALLOC_H #define XMALLOC_H #include #include "built_in.h" #include "die.h" extern void *xmalloc(size_t size) __hidden; extern void *xcalloc(size_t nmemb, size_t size) __hidden; extern void *xzmalloc(size_t size) __hidden; extern void *xmallocz(size_t size) __hidden; extern void *xmalloc_aligned(size_t size, size_t alignment) __hidden; extern void *xzmalloc_aligned(size_t size, size_t alignment) __hidden; extern void *xmemdupz(const void *data, size_t len) __hidden; extern void *xrealloc(void *ptr, size_t nmemb, size_t size) __hidden; extern void xfree_func(void *ptr) __hidden; extern char *xstrdup(const char *str) __hidden; extern char *xstrndup(const char *str, size_t size) __hidden; static inline void __xfree(void *ptr) { if (unlikely((ptr) == NULL)) panic("xfree: NULL pointer given as argument\n"); free(ptr); } #define xzfree(ptr, size) \ do { \ xmemset(ptr, 0, size); \ xfree(ptr); \ } while (0) #define xfree(ptr) \ do { \ __xfree(ptr); \ (ptr) = NULL; \ } while (0) #endif /* XMALLOC_H */ maclite-cleanup'>emaclite-cleanup net-next plumbingsTobias Klauser
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /security/tomoyo/environ.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'security/tomoyo/environ.c')