Mercurial > hg > nginx
annotate auto/define @ 6627:ad736705a744
HTTP/2: avoid left-shifting signed integer into the sign bit.
On non-aligned platforms, properly cast argument before left-shifting it in
ngx_http_v2_parse_uint32 that is used with u_char. Otherwise it propagates
to int to hold the value and can step over the sign bit. Usually, on known
compilers, this results in negation. Furthermore, a subsequent store into a
wider type, that is ngx_uint_t on 64-bit platforms, results in sign-extension.
In practice, this can be observed in debug log as a very large exclusive bit
value, when client sent PRIORITY frame with exclusive bit set:
: *14 http2 PRIORITY frame sid:5 on 1 excl:8589934591 weight:17
Found with UndefinedBehaviorSanitizer.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Thu, 07 Jul 2016 21:03:21 +0300 |
parents | d620f497c50f |
children |
rev | line source |
---|---|
444
42d11f017717
nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
parents:
337
diff
changeset
|
1 |
42d11f017717
nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
parents:
337
diff
changeset
|
2 # Copyright (C) Igor Sysoev |
4412 | 3 # Copyright (C) Nginx, Inc. |
444
42d11f017717
nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
parents:
337
diff
changeset
|
4 |
337
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
5 |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
6 cat << END >> $NGX_AUTO_CONFIG_H |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
7 |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
8 #ifndef $have |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
9 #define $have $value |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
10 #endif |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
11 |
4feff829a849
nginx-0.0.3-2004-05-19-00:28:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
12 END |