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Although the glibc source code suggests that it is possible to (and the Solaris implementation permits) have multiple dynamic linker auditing libraries, this feature does not appear to work correctly as currently implemented. My attempts to do this yield a SIGSEGV.
Created an attachment (id=3657) test program Below, two uses of an auditing library created from the attached source file. In the first run, the .so is assigned just once to LD_AUDIT. In the second run, the .so is assigned twice to LD_AUDIT, as a colon-separated list (leading to a SIGSEGV). $ cc -g -shared -fPIC -o audit.so audit.c $ LD_AUDIT=./audit.so /bin/true la_version(): 1 la_objopen(): loading ""; lmid = LM_ID_BASE; cookie=b7f5f8d0 la_objopen(): loading "/lib/ld-linux.so.2"; lmid = LM_ID_BASE; cookie=b7f5f4f0 la_activity(): cookie = b7f5f8d0; flag = LA_ACT_ADD la_objsearch(): name = libc.so.6; cookie = b7f5f8d0; flag = LA_SER_ORIG la_objsearch(): name = /lib/libc.so.6; cookie = b7f5f8d0; flag = LA_SER_CONFIG la_objopen(): loading "/lib/libc.so.6"; lmid = LM_ID_BASE; cookie=b7f41ad8 la_activity(): cookie = b7f5f8d0; flag = LA_ACT_CONSISTENT la_symbind32(): symname = __libc_start_main; sym->st_value = 0xb7c96510 ndx = 2149; flags = 0x0; refcook = b7f5f8d0; defcook = b7f41ad8 [...] $ LD_AUDIT=./audit.so:./audit.so /bin/true la_version(): 1 la_objsearch(): name = ./audit.so; cookie = 250; flag = LA_SER_ORIG Segmentation fault (core dumped)
By contrast, using a version of my audit.c library twice in a colon-separated library on Solaris 8 does what I would expect (i.e., the audit functions are called twice, once for each item listed in LD_AUDIT): $ gcc -g -shared -fPIC -o audit.so audit.c $ LD_AUDIT=./audit.so:./audit.so /bin/date la_version(): 2 la_objopen(): loading "/bin/date"; cookie=ff3712f0 la_objopen(): loading "/bin/date"; cookie=ff3712fc la_objopen() la_objopen() la_activity(): LA_ACT_ADD; cookie = ff3712f0 la_activity(): LA_ACT_ADD; cookie = ff3712f0 la_objsearch(): libc.so.1; ff3712f0; 1 la_objsearch(): libc.so.1; ff3712f0; 1 la_objsearch(): /usr/lib/libc.so.1; ff3712f0; 40 la_objsearch(): /usr/lib/libc.so.1; ff3712f0; 40 la_objopen(): loading "/usr/lib/libc.so.1"; cookie=ff3716d4 la_objopen(): loading "/usr/lib/libc.so.1"; cookie=ff3716e0 la_objsearch(): libdl.so.1; ff3716d4; 1 la_objsearch(): libdl.so.1; ff3716d4; 1 la_objsearch(): /usr/lib/libdl.so.1; ff3716d4; 40 la_objsearch(): /usr/lib/libdl.so.1; ff3716d4; 40 la_objopen(): loading "/usr/lib/libdl.so.1"; cookie=ff371a1c la_objopen(): loading "/usr/lib/libdl.so.1"; cookie=ff371a28 [...]
Fixed in cvs.