On Fri, Feb 23, 2024 at 03:45:10PM +0100, Miguel Ojeda wrote:
On Fri, Feb 23, 2024 at 2:38 PM Conor Dooley conor@kernel.org wrote:
configuring a kernel without symmetrical support for kfi.
Nit: typo.
This probably needs to go to stable. The correct fixes tag for that I am not sure of however, but since CFI_CLANG predates RUST, I blamed the commit adding rust support.
Cc'ing Matthew et al. in case this is a problem for them, but I guess we can relax it later as needed.
I suspect that nobody has actually sat down and tried it.
I did try to test it but I ran into too many toolchain issues - my older copies of LLVM (pre 17) are not multiarch as I built them by hand with PGO for x86 and RISC-V. My LLVM 17 is from kernel.org and has no libclang. And then the copy of LLVM 18 on kernel.org apparently does not support kcfi at all. I gave up there, but I don't see how this would not be a problem on other arches, given rustc never gets told to enable kcfi.
Cheers, Conor.