Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 345 by [email protected]: Use Linux
madvise(MADV_DONTDUMP) to exclude ASan shadow regions from core dumps
https://code.google.com/p/address-sanitizer/issues/detail?id=345
AddressSanitizer maps huge regions to support its state tracking, so core
dumps from ASan-managed processes are very large on 32-bit and unmanageably
large on 64-bit. The default-enabled feature of disabling core dumps
prevents these dumps from being generated, but in some cases, it would be
very useful to get a manageable dump from an ASan-enabled process. On
Linux 3.4 and later, the system call madvise accepts the command
MADV_DONTDUMP to exclude a region from being written to a core file. The
attached proof of concept patch uses this command to exclude the ASan
shadow ranges. A test program using the patched libsanitizer generates
core files that, although larger than an ASan-free build, are quite
manageable (~151M core for a trivial crash program). This test was done
with the libsanitizer that ships with gcc-4.9, but should apply equally to
clang libsanitizer.
Attachments:
0001-asan-madvise.patch 537 bytes
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