On Mon, Jul 22, 2024 at 10:53:10AM +0800, Jinjie Ruan wrote: > Gentle ping. > > On 2024/6/24 10:36, Jinjie Ruan wrote: > > Add the STACKLEAK gcc plugin to arm32 by adding the helper used by > > stackleak common code: on_thread_stack(). It initialize the stack with the > > poison value before returning from system calls which improves the kernel > > security. Additionally, this disables the plugin in EFI stub code and > > decompress code, which are out of scope for the protection. > > > > Before the test on Qemu versatilepb board: > > # echo STACKLEAK_ERASING > /sys/kernel/debug/provoke-crash/DIRECT > > lkdtm: Performing direct entry STACKLEAK_ERASING > > lkdtm: XFAIL: stackleak is not supported on this arch (HAVE_ARCH_STACKLEAK=n) > > > > After: > > # echo STACKLEAK_ERASING > /sys/kernel/debug/provoke-crash/DIRECT > > lkdtm: Performing direct entry STACKLEAK_ERASING > > lkdtm: stackleak stack usage: > > high offset: 80 bytes > > current: 280 bytes > > lowest: 696 bytes > > tracked: 696 bytes > > untracked: 192 bytes > > poisoned: 7220 bytes > > low offset: 4 bytes > > lkdtm: OK: the rest of the thread stack is properly erased > > > > Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx> > > Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Is this a feature that you have a use case for? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
