implement adaptive redzones

[ramosian-glider]

Originally reported on Google Code with ID 8

When instrumenting global arrays, we add fixed-size redzones (32 bytes) to them.
If the array has two or more dimensions, we're likely to miss the redzone even if the
array index is off by one:

char arr[40][40];
char arr2[40];

arr[40][0] = 'a';  // this will hit arr2

We may want to vary the size for two-dimensional arrays depending on their sizes.

Reported by ramosian.glider on 2011-10-14 18:51:22

[ramosian-glider]

Reported by ramosian.glider on 2011-10-14 18:51:47

[ramosian-glider]

We may want to implement adaptive redzones for globals and for heap. 
Maybe even for stack. 
The hypothesis is that large objects tend to be overflown by larger amounts. 
I don't think this should have anything to do with two-dimensional arrays. 

Reported by konstantin.s.serebryany on 2011-10-31 17:44:34

[ramosian-glider]

Reported by ramosian.glider on 2012-02-02 12:14:56

• Labels added: Type-Enhancement
• Labels removed: Type-Defect

[ramosian-glider]

- adaptive redzones for globals are committed as LLVM r173335/r173336
- adaptive redzones for heap are a part of the new asan allocator

Need to think what to do with stack. 

Reported by konstantin.s.serebryany on 2013-01-24 10:38:29

[ramosian-glider]

Reported by ramosian.glider on 2013-02-07 16:02:20

[ramosian-glider]

A somewhat related problem: http://llvm.org/bugs/show_bug.cgi?id=16277
(can't handle stack objects aligned by more than 32 bytes).
This may potentially be solved together with adaptive redzones for stack. 

Reported by konstantin.s.serebryany on 2013-06-26 09:56:57

[ramosian-glider]

Fixed, see https://code.google.com/p/address-sanitizer/issues/detail?id=245#c2

Reported by konstantin.s.serebryany on 2013-12-06 09:12:55

• Status changed: Fixed

[ramosian-glider]

Adding Project:AddressSanitizer as part of GitHub migration.

Reported by ramosian.glider on 2015-07-30 09:12:57

• Labels added: ProjectAddressSanitizer