diff options
Diffstat (limited to 'arch/x86/kernel/sys_x86_64.c')
| -rw-r--r-- | arch/x86/kernel/sys_x86_64.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c index f840e895d871..73e4d28112f8 100644 --- a/arch/x86/kernel/sys_x86_64.c +++ b/arch/x86/kernel/sys_x86_64.c @@ -101,8 +101,8 @@ out: return error; } -static void find_start_end(unsigned long flags, unsigned long *begin, - unsigned long *end) +static void find_start_end(unsigned long addr, unsigned long flags, + unsigned long *begin, unsigned long *end) { if (!in_compat_syscall() && (flags & MAP_32BIT)) { /* This is usually used needed to map code in small @@ -121,7 +121,10 @@ static void find_start_end(unsigned long flags, unsigned long *begin, } *begin = get_mmap_base(1); - *end = in_compat_syscall() ? task_size_32bit() : task_size_64bit(); + if (in_compat_syscall()) + *end = task_size_32bit(); + else + *end = task_size_64bit(addr > DEFAULT_MAP_WINDOW); } unsigned long @@ -140,7 +143,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, if (flags & MAP_FIXED) return addr; - find_start_end(flags, &begin, &end); + find_start_end(addr, flags, &begin, &end); if (len > end) return -ENOMEM; @@ -204,6 +207,16 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.length = len; info.low_limit = PAGE_SIZE; info.high_limit = get_mmap_base(0); + + /* + * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area + * in the full address space. + * + * !in_compat_syscall() check to avoid high addresses for x32. + */ + if (addr > DEFAULT_MAP_WINDOW && !in_compat_syscall()) + info.high_limit += TASK_SIZE_MAX - DEFAULT_MAP_WINDOW; + info.align_mask = 0; info.align_offset = pgoff << PAGE_SHIFT; if (filp) { |