https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275393
Bug ID: 275393
Summary: RTLD_DEEPBIND semantics not quite right
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 246617
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246617&action=edit
Minimal reproducer
Consider the attached example, with a build.sh to build it:
libutil provides get_value, set_value -- it's built into both libutil.so and
libutil2.so, two separate libraries with purposefully conflicting symbols
libfoo provides print_value (which calls get_value) and links against libutil2
app links against libutil and dlopens $ORIGIN/libfoo.so with RTLD_DEEPBIND and
calls set_value(5) to get a different value for get_value()
On Linux, this prints:
% ./app
application value 5
library value: 10
On FreeBSD:
$ ./app
application value 5
library value: 5
So under glibc, symbol_lookup from the dlopened image prefers symbols from the
same chain of objects that were loaded at that dlopen time, not just the same
image.
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