The 12/10/2020 14:51, Adhemerval Zanella wrote:

On 27/11/2020 10:19, Szabolcs Nagy via Libc-alpha wrote:

quoted

The _dl_open_check and _rtld_main_check hooks are not called on the
dependencies of a loaded module, so BTI protection was missed on
every module other than the main executable and directly dlopened
libraries.

The fix just iterates over dependencies to enable BTI.

Fixes bug 26926.

LGTM, modulus the argument name change.

I also think it would be better to add a testcase, for both DT_NEEDED
and dlopen case.

thanks, i committed this with fixed argument name as attached.

i plan to do tests later once i understand the BTI semantics
(right now it's not clear if in the presence of some W^X
policy BTI may be silently ignored or not).