Re: [PATCH v2 05/17] vdso: Avoid call to memset() by getrandom

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





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




[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [NTFS 3]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [NTFS 3]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux