http://llvm.org/bugs/show_bug.cgi?id=13794
Bug #: 13794
Summary: AddressSanitizer should detect and warn if
MallocGuardEdges env var is on
Product: new-bugs
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
On Mac OS X, there is a system environment variable called MallocGuardEdges.
'man malloc' describes it thusly:
"If set, add a guard page before and after each large block"
We had ASan working in toy apps, but it took us quite a while to figure out why
it was failing with our large projects, and it was because he had this env var
set as part of our standard debugging settings.
If would be a nice piece of finesse if, at runtime, you detect if this env var
is set and print a big error message. Might save some other people some hours.
:)
$ MallocGuardEdges=1 ./boom
boom(7300) malloc: protecting edges
==7300== AddressSanitizer CHECK failed:
/Users/alex/external/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:274
"((!asan_init_is_running)) != (0)" (0x0, 0x0)
Stats: 0M malloced (0M for red zones) by 0 calls
Stats: 0M realloced by 0 calls
Stats: 0M freed by 0 calls
Stats: 0M really freed by 0 calls
Stats: 0M (0 full pages) mmaped in 0 calls
mmaps by size class:
mallocs by size class:
frees by size class:
rfrees by size class:
Stats: malloc large: 0 small slow: 0
(MallocGuardEdges is much less capable than ASan, so I don't care that they
don't work together, I'm just asking that I be warned.)
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