diff --git a/include/linux/mm.h b/include/linux/mm.h index 520238cbae5d..1b7b95c67aca 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -12,6 +12,7 @@ #include #include #include +#include struct mempolicy; struct anon_vma; @@ -512,6 +513,21 @@ static inline void set_page_links(struct page *page, enum zone_type zone, set_page_section(page, pfn_to_section_nr(pfn)); } +/* + * If a hint addr is less than mmap_min_addr change hint to be as + * low as possible but still greater than mmap_min_addr + */ +static inline unsigned long round_hint_to_min(unsigned long hint) +{ +#ifdef CONFIG_SECURITY + hint &= PAGE_MASK; + if (((void *)hint != NULL) && + (hint < mmap_min_addr)) + return PAGE_ALIGN(mmap_min_addr); +#endif + return hint; +} + /* * Some inline functions in vmstat.h depend on page_zone() */ diff --git a/mm/mmap.c b/mm/mmap.c index 938313c76d02..f4cfc6ac08db 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -912,6 +912,9 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr, if (!len) return -EINVAL; + if (!(flags & MAP_FIXED)) + addr = round_hint_to_min(addr); + error = arch_mmap_check(addr, len, flags); if (error) return error; diff --git a/mm/nommu.c b/mm/nommu.c index 35622c590925..b989cb928a7c 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -829,6 +829,9 @@ unsigned long do_mmap_pgoff(struct file *file, void *result; int ret; + if (!(flags & MAP_FIXED)) + addr = round_hint_to_min(addr); + /* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff,