Returning its argument without further checks is almost always wrong for la_version. Signed-off-by: Florian Weimer <fweimer@xxxxxxxxxx> --- man7/rtld-audit.7 | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/man7/rtld-audit.7 b/man7/rtld-audit.7 index b1b7dfebc..ca8afa752 100644 --- a/man7/rtld-audit.7 +++ b/man7/rtld-audit.7 @@ -70,17 +70,30 @@ the auditing library. When invoking this function, the dynamic linker passes, in .IR version , the highest version of the auditing interface that the linker supports. -If necessary, the auditing library can check that this version -is sufficient for its requirements. .PP -As its function result, -this function should return the version of the auditing interface -that this auditing library expects to use (returning +A typical implementation of this function simply returns the constant +.BR LAV_CURRENT , +which indicates the version of +.I <link.h> +that was used to build the audit module. If the dynamic linker does +not support this version of the audit interface, it will refuse to +activate this audit module. If the function returns zero, the dynamic +linker also does not activate this audit module. +.PP +In order to enable backwards compatibility with older dynamic linkers, +an audit module can examine the +.I version +argument and return an earlier version than +.BR LAV_CURRENT , +assuming the module can adjust its implement to match the requirements +of the previous version of the audit interface. The +.B la_version +function should not return the value of .I version -is acceptable). -If the returned value is 0, -or a version that is greater than that supported by the dynamic linker, -then the audit library is ignored. +without further checks because it could correspond to an interface +that does not match the +.I <link.h> +definitions used to build the audit module. .SS la_objsearch() \& .nf -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill
