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It violates thread safety. #601. Suricata assures thread safety on the flow level for HTTP tracking. Part of the flow is (in case of HTTP) libhtp's htp_connp_t state. At startup the libhtp glue layer, app-layer-htp initializes as many htp_cfg_t instances as there are libhtp server configurations in the yaml. At HTTP session start, we look up the proper htp_cfg_t based on the server ip and pass it to htp_connp_create. A ptr to the relevant htp_cfg_t is part of the htp_connp_t. The htp_cfg_t contains "hooks". The are registered based on yaml config at init time. The hooks have lists of type list_t. The list is run with a built in iterator. The iterator is reset at the start of each "hook_run_all". Since multiple flows share the same htp_cfg_t flow A can reset the iterator while flow B is using it. The flow lock has no effect as flows share the htp_cfg_t. This has been observed in real traffic. hook_response_body_data was run on the same data multiple times, leading to corrupt extracted files. |
13 years ago | |
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benches | 16 years ago | |
contrib/file_processor | 13 years ago | |
doc | 13 years ago | |
libhtp | 13 years ago | |
m4 | 15 years ago | |
qa | 13 years ago | |
rules | 13 years ago | |
src | 13 years ago | |
.gitignore | 14 years ago | |
COPYING | 16 years ago | |
ChangeLog | 13 years ago | |
LICENSE | 15 years ago | |
Makefile.am | 13 years ago | |
Makefile.cvs | 16 years ago | |
acsite.m4 | 16 years ago | |
autogen.sh | 13 years ago | |
classification.config | 15 years ago | |
configure.ac | 13 years ago | |
doxygen.cfg | 13 years ago | |
mkinstalldirs | 15 years ago | |
reference.config | 13 years ago | |
suricata.yaml.in | 13 years ago | |
threshold.config | 13 years ago |