Hi Michael,
On Tue, Aug 22, 2023 at 10:27 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
Am 21.08.2023 um 19:50 schrieb Geert Uytterhoeven:
+ ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
+
+ if (base_res) { /* only Q40 has IO resources */
+ io_offset = 0x10000;
+ reg_scale = 1;
+ base = (void __iomem *)base_res->start;
+ ctl_base = (void __iomem *)ctl_res->start;
+
+ ata_port_desc(ap, "cmd %pa ctl %pa",
+ &base_res->start,
+ &ctl_res->start);
This can be moved outside the else, using %px to format base and
ctl_base.
I get a checkpatch warning for %px, but not for %pa (used for .
&ap->ioaddr.data_addr). What gives?
WARNING: Using vsprintf specifier '%px' potentially exposes the kernel
memory layout, if you don't really need the address please consider
using '%p'.
#148: FILE: drivers/ata/pata_falcon.c:194:
+ ata_port_desc(ap, "cmd %px ctl %px data %pa",
+ base, ctl_base, &ap->ioaddr.data_addr);
You can ignore this.
%p prints obfuscated pointer values, so they are useless here.
%px prints an unobfuscated pointer value, which is fine here, as it's
not a pointer to kernel memory that an attacker can use, but just the
virtual address of an I/O device mapped one-to-one.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
