On Mon, Jan 22, 2024 at 05:12:38PM -0800, Kees Cook wrote: > Under PAN emulation when dumping backtraces from things like the > LKDTM EXEC_USERSPACE test[1], a double fault (which would hang a CPU) > would happen because of dump_instr() attempting to read a userspace > address. Make sure copy_from_kernel_nofault() does not attempt this > any more. > > Reported-by: Mark Brown <[email protected]> > Link: https://lore.kernel.org/all/202401181125.D48DCB4C@keescook/ [1] > Suggested-by: "Russell King (Oracle)" <[email protected]> > Cc: Russell King <[email protected]> > Cc: Ard Biesheuvel <[email protected]> > Cc: Wang Kefeng <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Ben Hutchings <[email protected]> > Cc: [email protected] > Signed-off-by: Kees Cook <[email protected]>
Russell, do you mind if I carry in my tree the 3 ARM patches I sent? They're mostly pretty trivial, and they've been in "Incoming"[1] for 2 weeks but haven't shown up in -next yet. I'd really like them to get some soak time, and for them to reach the v6.9 merge window in time. Please let me know what you think. :) Thanks! -Kees [1] https://www.arm.linux.org.uk/developer/patches/section.php?section=0 -- Kees Cook
