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authorKonstantin Khlebnikov <koct9i@gmail.com>2016-02-02 16:57:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-02-03 08:28:43 -0800
commitd977d56ce5b3e8842236f2f9e7483d4914c9592e (patch)
tree179e5850a0567927d38e34a96747d53415b535b3 /mm/internal.h
parent4758e198ad3bcbc1c468e0632c53a63a7d201649 (diff)
downloadlwn-d977d56ce5b3e8842236f2f9e7483d4914c9592e.tar.gz
lwn-d977d56ce5b3e8842236f2f9e7483d4914c9592e.zip
mm: warn about VmData over RLIMIT_DATA
This patch provides a way of working around a slight regression introduced by commit 84638335900f ("mm: rework virtual memory accounting"). Before that commit RLIMIT_DATA have control only over size of the brk region. But that change have caused problems with all existing versions of valgrind, because it set RLIMIT_DATA to zero. This patch fixes rlimit check (limit actually in bytes, not pages) and by default turns it into warning which prints at first VmData misuse: "mmap: top (795): VmData 516096 exceed data ulimit 512000. Will be forbidden soon." Behavior is controlled by boot param ignore_rlimit_data=y/n and by sysfs /sys/module/kernel/parameters/ignore_rlimit_data. For now it set to "y". [akpm@linux-foundation.org: tweak kernel-parameters.txt text[ Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Link: http://lkml.kernel.org/r/20151228211015.GL2194@uranus Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Kees Cook <keescook@google.com> Cc: Willy Tarreau <w@1wt.eu> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index ed8b5ffcf9b1..6e976302ddd8 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -216,6 +216,22 @@ static inline bool is_cow_mapping(vm_flags_t flags)
return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
}
+static inline bool is_exec_mapping(vm_flags_t flags)
+{
+ return (flags & (VM_EXEC | VM_WRITE)) == VM_EXEC;
+}
+
+static inline bool is_stack_mapping(vm_flags_t flags)
+{
+ return (flags & (VM_STACK_FLAGS & (VM_GROWSUP | VM_GROWSDOWN))) != 0;
+}
+
+static inline bool is_data_mapping(vm_flags_t flags)
+{
+ return (flags & ((VM_STACK_FLAGS & (VM_GROWSUP | VM_GROWSDOWN)) |
+ VM_WRITE | VM_SHARED)) == VM_WRITE;
+}
+
/* mm/util.c */
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev, struct rb_node *rb_parent);