diff options
Diffstat (limited to 'apr-1.7.0-deepbind.patch')
| -rw-r--r-- | apr-1.7.0-deepbind.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/apr-1.7.0-deepbind.patch b/apr-1.7.0-deepbind.patch new file mode 100644 index 0000000..3a40d22 --- /dev/null +++ b/apr-1.7.0-deepbind.patch @@ -0,0 +1,60 @@ + +Add $APR_DEEPBIND to enable use of RTLD_DEEPBIND in apr_dso_open(). + +--- apr-1.7.0/dso/unix/dso.c.deepbind ++++ apr-1.7.0/dso/unix/dso.c +@@ -38,6 +38,8 @@ + #define DYLD_LIBRARY_HANDLE (void *)-1 + #endif + ++static int use_deepbind; /* 0 = unset, 1 = use DEEPBIND, -1, don't use DEEPBIND */ ++ + APR_DECLARE(apr_status_t) apr_os_dso_handle_put(apr_dso_handle_t **aprdso, + apr_os_dso_handle_t osdso, + apr_pool_t *pool) +@@ -125,6 +127,12 @@ + #else + int flags = RTLD_NOW | RTLD_GLOBAL; + void *os_handle; ++ ++ if (use_deepbind == 0) ++ use_deepbind = secure_getenv("APR_DEEPBIND") != NULL ? 1 : -1; ++ if (use_deepbind == 1) ++ flags |= RTLD_DEEPBIND; ++ + #ifdef _AIX + if (strchr(path + 1, '(') && path[strlen(path) - 1] == ')') + { +--- apr-1.7.0/README.deepbind.deepbind ++++ apr-1.7.0/README.deepbind +@@ -0,0 +1,30 @@ ++This distribution of APR contains a modification of the behaviour of ++the apr_dso_open() function which allows users enable the ++"RTLD_DEEPBIND" flag when dlopen() is called. ++ ++If the "APR_DEEPBIND" environment variable is set at runtime, the ++RTLD_DEEPBIND flag is always added to the flags passed to dlopen(). ++ ++With normal use of dlopen(), dynamically loaded objects will use ++global symbols in preference to any symbols defined within the object. ++Using RTLD_DEEPBIND reverses this binding order. See the dlopen(3) ++man page for more information. ++ ++This can be useful with Apache httpd, where two different modules are ++loaded like: ++ ++1. mod_foo.so uses library "libfoo.so" ++ libfoo.so defines a function "SomeSym" ++2. mod_bar.so uses library "libbar.so" ++ libbar.so defines a different "SomeSym" function ++ ++By default, mod_bar or mod_foo would use the "SomeSym" definition from ++the "wrong" library depending on the load order. If RTLD_DEEPBIND is ++used, the "SomeSym" definition will always be mapped to the definition ++from the corresponding dependent library. This can avoid symbol ++conflicts. ++ ++There are some risks with using RTLD_DEEPBIND, in particular potential ++issues with modules written in C++. It is not recommended to enable ++$APR_DEEPBIND unless it solves a specific problem and after thorough ++testing of the configuration. |