To eliminate code duplication lets introduce may_adjust_brk helper which we will use in brk() and prctl() syscalls.
Signed-off-by: Cyrill Gorcunov <[email protected]> Cc: Kees Cook <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Andrew Vagin <[email protected]> Cc: Eric W. Biederman <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Serge Hallyn <[email protected]> Cc: Pavel Emelyanov <[email protected]> Cc: Vasiliy Kulikov <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Michael Kerrisk <[email protected]> Cc: Julien Tinnes <[email protected]> --- include/linux/mm.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) Index: linux-2.6.git/include/linux/mm.h =================================================================== --- linux-2.6.git.orig/include/linux/mm.h +++ linux-2.6.git/include/linux/mm.h @@ -18,6 +18,7 @@ #include <linux/pfn.h> #include <linux/bit_spinlock.h> #include <linux/shrinker.h> +#include <linux/resource.h> struct mempolicy; struct anon_vma; @@ -1780,6 +1781,19 @@ extern struct vm_area_struct *copy_vma(s bool *need_rmap_locks); extern void exit_mmap(struct mm_struct *); +static inline int may_adjust_brk(unsigned long rlim, + unsigned long new_brk, + unsigned long start_brk, + unsigned long end_data, + unsigned long start_data) +{ + if (rlim < RLIMIT_DATA) { + if (((new_brk - start_brk) + (end_data - start_data)) > rlim) + return -ENOSPC; + } + return 0; +} + extern int mm_take_all_locks(struct mm_struct *mm); extern void mm_drop_all_locks(struct mm_struct *mm); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
