A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-31 04:01:48 -04:00
Code Issues Projects Releases Packages Wiki Activity

mm: warn about VmData over RLIMIT_DATA

Browse source 
This patch provides a way of working around a slight regression
introduced by commit 8463833590 ("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".

[[email protected]: tweak kernel-parameters.txt text[
Signed-off-by: Konstantin Khlebnikov <[email protected]>
Link: http://lkml.kernel.org/r/20151228211015.GL2194@uranus
Reported-by: Christian Borntraeger <[email protected]>
Cc: Cyrill Gorcunov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Vegard Nossum <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Quentin Casasnovas <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Willy Tarreau <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2016-02-02 16:57:43 -08:00 • committed by Linus Torvalds
commit d977d56ce5
3 changed files with 38 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

16
mm/internal.h
View file

@ -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);