Le 29/08/2024 à 20:02, Segher Boessenkool a écrit :
On Thu, Aug 29, 2024 at 07:36:38PM +0200, Christophe Leroy wrote:
Le 28/08/2024 à 19:25, Segher Boessenkool a écrit :
Not sure about static binaries, though: do those even use the VDSO?
With "static binary" people usually mean "a binary not using any DSOs",
I think the VDSO is a DSO, also in this respect? As always, -static
builds are *way* less problematic (and faster and smaller :-) )
AFAIK on powerpc even static binaries use the vDSO, otherwise signals
don't work.
How can that work? Non-dynamic binaries do not use ld.so (that is the
definition of a dynamic binary, even). So they cannot link (at runtime)
to any DSO (unless that is done manually?!)
Maybe there is something at a fixed offset in the vDSO, or something
like that? Is this documented somewhere?
You've got some explanation here :
https://github.com/torvalds/linux/blob/master/Documentation/ABI/stable/vdso
