search for: wnr

...ally wild pointer > like this? > > Sanitising is an option on the table -- we could fake up something like a > level 0 translation fault, I'm just wary of faking things up if we could > avoid the problem altogether (hence this email). > > It's also worth noting that the WnR bit needs special treatment for things > like atomic instructions and cache maintenance instructions which currently > appears to be missing. Would it be to bad to look at si_addr to spot kernel > addresses and handle them specially? We use this for preliminary classification of bugs, on...

...read/write information for a totally wild pointer like this? Sanitising is an option on the table -- we could fake up something like a level 0 translation fault, I'm just wary of faking things up if we could avoid the problem altogether (hence this email). It's also worth noting that the WnR bit needs special treatment for things like atomic instructions and cache maintenance instructions which currently appears to be missing. Would it be to bad to look at si_addr to spot kernel addresses and handle them specially? > Also, your patch looks like it would disable ESR context for all...

On Wed, Mar 7, 2018 at 7:48 AM, Dmitry Vyukov <dvyukov at google.com> wrote: > On Wed, Mar 7, 2018 at 4:39 PM, Andrey Ryabinin <aryabinin at virtuozzo.com> wrote: >> On 03/06/2018 08:58 PM, Will Deacon wrote: >>> Hi all, >>> >>> As part of some recent work to harden the Kernel Address Space Layout >>> Randomisation (KASLR) implementation in

...463.718852][ T5040] EC = 0x25: DABT (current EL), IL = 32 bits > [ 463.718853][ T5040] SET = 0, FnV = 0 > [ 463.718854][ T5040] EA = 0, S1PTW = 0 > [ 463.718855][ T5040] Data abort info: > [ 463.718856][ T5040] ISV = 0, ISS = 0x00000044 > [ 463.718857][ T5040] CM = 0, WnR = 1 > [ 463.718859][ T5040] user pgtable: 4k pages, 48-bit VAs, pgdp=0000008f6f6e9000 > [ 463.718861][ T5040] [0000000000000000] pgd=0000000000000000 > [ 463.718866][ T5040] Internal error: Oops: 96000044 [#1] SMP > [...] > [ 463.718977][ T5040] CPU: 213 PID: 5040 Comm: vhost-503...

...463.718852][ T5040] EC = 0x25: DABT (current EL), IL = 32 bits > [ 463.718853][ T5040] SET = 0, FnV = 0 > [ 463.718854][ T5040] EA = 0, S1PTW = 0 > [ 463.718855][ T5040] Data abort info: > [ 463.718856][ T5040] ISV = 0, ISS = 0x00000044 > [ 463.718857][ T5040] CM = 0, WnR = 1 > [ 463.718859][ T5040] user pgtable: 4k pages, 48-bit VAs, pgdp=0000008f6f6e9000 > [ 463.718861][ T5040] [0000000000000000] pgd=0000000000000000 > [ 463.718866][ T5040] Internal error: Oops: 96000044 [#1] SMP > [...] > [ 463.718977][ T5040] CPU: 213 PID: 5040 Comm: vhost-503...

...[ 12.050628] ESR = 0x96000004 > [ 12.050630] Exception class = DABT (current EL), IL = 32 bits > [ 12.050631] SET = 0, FnV = 0 > [ 12.050632] EA = 0, S1PTW = 0 > [ 12.050633] Data abort info: > [ 12.050634] ISV = 0, ISS = 0x00000004 > [ 12.050635] CM = 0, WnR = 0 > [ 12.050637] user pgtable: 4k pages, 48-bit VAs, pgd = 00000000af2ac1b1 > [ 12.050639] [0000000000000058] *pgd=0000000000000000 > [ 12.050643] Internal error: Oops: 96000004 [#1] SMP > [ 12.050644] Modules linked in: dwmac_dwc_qos_eth(+) stmmac_platform > stmmac ptp nou...

...12.050627] Mem abort info: [ 12.050628] ESR = 0x96000004 [ 12.050630] Exception class = DABT (current EL), IL = 32 bits [ 12.050631] SET = 0, FnV = 0 [ 12.050632] EA = 0, S1PTW = 0 [ 12.050633] Data abort info: [ 12.050634] ISV = 0, ISS = 0x00000004 [ 12.050635] CM = 0, WnR = 0 [ 12.050637] user pgtable: 4k pages, 48-bit VAs, pgd = 00000000af2ac1b1 [ 12.050639] [0000000000000058] *pgd=0000000000000000 [ 12.050643] Internal error: Oops: 96000004 [#1] SMP [ 12.050644] Modules linked in: dwmac_dwc_qos_eth(+) stmmac_platform stmmac ptp nouveau(+) tegra_drm(+) i2c_...

...12.219487] Mem abort info: [ 12.222279] ESR = 0x96000004 [ 12.225328] Exception class = DABT (current EL), IL = 32 bits [ 12.231248] SET = 0, FnV = 0 [ 12.234294] EA = 0, S1PTW = 0 [ 12.237437] Data abort info: [ 12.240319] ISV = 0, ISS = 0x00000004 [ 12.244155] CM = 0, WnR = 0 [ 12.247133] user pgtable: 4k pages, 48-bit VAs, pgd = 00000000fe9c3e9c [ 12.253646] [0000000000000510] *pgd=0000000000000000 [ 12.258616] Internal error: Oops: 96000004 [#1] SMP [ 12.263483] Modules linked in: dwmac_dwc_qos_eth(+) stmmac_platform stmmac gpio_keys nouveau(+) ptp tegra_d...