diff options
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/mm/util.c b/mm/util.c index 41b47d8cae09..cd62e6fb5318 100644 --- a/mm/util.c +++ b/mm/util.c @@ -604,6 +604,24 @@ void kvfree(const void *addr) } EXPORT_SYMBOL(kvfree); +/** + * kvfree_sensitive - Free a data object containing sensitive information. + * @addr: address of the data object to be freed. + * @len: length of the data object. + * + * Use the special memzero_explicit() function to clear the content of a + * kvmalloc'ed object containing sensitive data to make sure that the + * compiler won't optimize out the data clearing. + */ +void kvfree_sensitive(const void *addr, size_t len) +{ + if (likely(!ZERO_OR_NULL_PTR(addr))) { + memzero_explicit((void *)addr, len); + kvfree(addr); + } +} +EXPORT_SYMBOL(kvfree_sensitive); + static inline void *__page_rmapping(struct page *page) { unsigned long mapping; @@ -796,10 +814,6 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) { long allowed; - VM_WARN_ONCE(percpu_counter_read(&vm_committed_as) < - -(s64)vm_committed_as_batch * num_online_cpus(), - "memory commitment underflow"); - vm_acct_memory(pages); /* |