Am 19.09.2017 um 23:38 schrieb Tom St Denis: > On 19/09/17 02:33 PM, Christian König wrote: >>> [root at carrizo ~]# xxd -l 1024 -s 0xC0000 >>> /sys/kernel/debug/dri/0/amdgpu_iova >> >> Actually 0xC0000 is a special address, e.g. video BIOS if I'm not >> completely mistaken. > > Not sure why that would be mapped by the driver but I can also read > the kernel's bss section with this... > > $ xxd -l 1048576 -s 0x01e4c000 /sys/kernel/debug/dri/0/amdgpu_iova > > ...<snip>... > 01e6a430: 4c69 6e75 7820 7665 7273 696f 6e20 342e Linux version 4. > 01e6a440: 3133 2e30 2d72 6335 2b20 2872 6f6f 7440 13.0-rc5+ (root@ > 01e6a450: 6361 7272 697a 6f29 2028 6763 6320 7665 carrizo) (gcc ve > 01e6a460: 7273 696f 6e20 362e 332e 3120 3230 3136 rsion 6.3.1 2016 > 01e6a470: 3132 3231 2028 5265 6420 4861 7420 362e 1221 (Red Hat 6. > 01e6a480: 332e 312d 3129 2028 4743 4329 2920 2333 3.1-1) (GCC)) #3 > 01e6a490: 3120 534d 5020 5475 6520 5365 7020 3139 1 SMP Tue Sep 19 > 01e6a4a0: 2030 373a 3138 3a33 3120 4544 5420 3230 07:18:31 EDT 20 > <snip> > > That's part of the dmesg buffer apparently. > > I pointed it at all sorts of address (bios/system ram/etc) it pretty > much will read anything. Yeah, feared that this would be the case. OK in this case your original concern was completely correct and we can't allow this in general. Christian. > > Tom > _______________________________________________ > amd-gfx mailing list > amd-gfx at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
