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Date: Fri, 11 Dec 2020 15:33:34 +0000
From: Szabolcs Nagy <>
To: Adhemerval Zanella <>
Cc:, Mark Rutland <>,,
	Catalin Marinas <>,, Jeremy Linton <>,
	Mark Brown <>,
	Topi Miettinen <>, Will Deacon <>,
Subject: Re: [PATCH v2 1/6] aarch64: Fix missing BTI protection from
 dependencies [BZ #26926]

The 12/10/2020 14:51, Adhemerval Zanella wrote:
> On 27/11/2020 10:19, Szabolcs Nagy via Libc-alpha wrote:
> > 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).

View attachment "0001-aarch64-Fix-missing-BTI-protection-from-dependencies.patch" of type "text/x-diff" (1448 bytes)

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