On Mon, Feb 5, 2018 at 8:44 PM, Petr Mladek <pmla...@suse.com> wrote: > Hi, > > I add people who actively commented on adding %px modifier, > see the thread starting at > https://lkml.kernel.org/r/1511921105-3647-5-git-send-email...@tobin.cc > > Just for reference. It seems to be related to the commit 9f36e2c448007b54 > ("printk: use %pK for /proc/kallsyms and /proc/modules"). > > > On Sun 2018-02-04 18:45:21, Adam Borowski wrote: >> Like %pK already does, print "00000000" instead. >> >> This confused people -- the convention is that "(null)" means you tried to >> dereference a null pointer as opposed to printing the address. > > By other words, this avoids regressions when people convert > %x to %px. Do I get it right, please?
Nothing should be converting from %x to %px, it's %p to %px. %p print "(null)" for 0x0, so it would be surprising for a conversion from %p to %px to change that. (Though generally speaking "(null)" is never useful...) -Kees -- Kees Cook Pixel Security
