Hi Finn,
On Tue, Feb 13, 2018 at 1:48 AM, Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> wrote:
On Mon, 12 Feb 2018, Geert Uytterhoeven wrote:
Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with
%p"), the virtual memory layout printed during boot up contains "ptrval"
instead of actual addresses:
Memory: 268040K/276480K available (2979K kernel code, 310K rwdata, 784K rodata, 144K init, 172K bss, 8440K reserved, 0K cma-reserved)
Virtual kernel memory layout:
vector : 0x003d2e74 - 0x003d3274 ( 1 KiB)
kmap : 0xd0000000 - 0xf0000000 ( 512 MiB)
vmalloc : 0x11800000 - 0xd0000000 (3048 MiB)
lowmem : 0x00000000 - 0x11000000 ( 272 MiB)
.init : 0x(ptrval) - 0x(ptrval) ( 144 KiB)
.text : 0x(ptrval) - 0x(ptrval) (2980 KiB)
.data : 0x(ptrval) - 0x(ptrval) (1095 KiB)
.bss : 0x(ptrval) - 0x(ptrval) ( 173 KiB)
Instead of changing the printing to "%px", and leaking virtual memory
layout information again,
just remove the printing completely, cfr. e.g.
commit 071929dbdd865f77 ("arm64: Stop printing the virtual memory
layout").
All interesting information (actual section sizes) is already printed by
mem_init_print_info() just above anyway.
Or maybe revert to %lx with pr_debug instead of pr_notice. Just a thought;
(%px prints unhashed pointers, no need for %lx and cast)
I don't have any preference.
Dynamic debug is hot these days, so that may be enabled by distros,
still leaking the info.
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
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