Hi, On Wed, Jan 15, 2025 at 1:36 AM Jiri Olsa <olsajiri@xxxxxxxxx> wrote: > > On Tue, Jan 14, 2025 at 06:25:20PM +0100, Oleg Nesterov wrote: > > On 01/14, Jiri Olsa wrote: > > > > > > ugh.. could we just 'disable' uretprobe trampoline when seccomp gets enabled? > > > overwrite first byte with int3.. and similarly check on seccomp when installing > > > uretprobe and switch to int3 > > > > Sorry, I don't understand... What exactly we can do? Aside from checking > > IS_ENABLED(CONFIG_SECCOMP) in arch_uprobe_trampoline() ? > > I need to check more on seccomp, but I imagine we could do following: > - when seccomp filter is installed we could check uprobe trampoline > and if it's already installed we change it to int3 trampoline > - when uprobe trampoline is getting installed we check if there's > seccomp filter installed for task and we use int3 trampoline Sounds reasonable to me. I'm wondering how hard it is to figure out the seccomp installation given that from what I understand it's inherited. > > other than that I guess we will have to add sysctl to enable uretprobe > trampoline.. I'm wondering when one would enable/disable such sysctl. "Give me speed but potentially crash processes I don't control" is a curious semantic... Eyal > > jirka
