On Fri, 14 Jun 2024 23:08:44 +0530, Anjali K wrote:
> Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*
> results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as
> shown below.
>
> kernel BUG at mm/usercopy.c:102!
> Oops: Exception in kernel mode, si
Anjali K writes:
> Hi Michael
>
> On 18/06/24 12:41, Michael Ellerman wrote:
>> I guess there isn't a kmem_cache_create_user_readonly() ?
> Thank you for your review.
>
> My understanding of the question is whether there's a way to whitelist a
Hi Michael
On 18/06/24 12:41, Michael Ellerman wrote:
> I guess there isn't a kmem_cache_create_user_readonly() ?
Thank you for your review.
My understanding of the question is whether there's a way to whitelist a
region such that it can be co
On Thu, Jun 20, 2024 at 10:58:49PM +0530, Anjali K wrote:
> However given that:
> (i) The dtl buffer is read-only. The dtl trace is a set of metrics which
> are collected to be read by privileged users.
> (ii)
Hi Kees
Thank you for your review.
On 17/06/24 23:29, Kees Cook wrote:
> On Fri, Jun 14, 2024 at 11:08:44PM +0530, Anjali K wrote:
>> Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*
>> results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as
>> shown below.
Kees Cook writes:
> On Fri, Jun 14, 2024 at 11:08:44PM +0530, Anjali K wrote:
>> Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*
>> results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as
>> shown below.
>>
>> kernel BUG at mm/usercopy.c:102!
>> O
On Fri, Jun 14, 2024 at 11:08:44PM +0530, Anjali K wrote:
> Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*
> results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as
> shown below.
>
> kernel BUG at mm/usercopy.c:102!
> Oops: Exception in kernel mo
> Commit 6d07d1cd300f ("usercopy: Restrict non-usercopy caches to size 0")
> requires that only whitelisted areas in slab/slub objects can be copied to
> userspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY.
> Dtl contains hypervisor dispatch events which are expected to be r
Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*
results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as
shown below.
kernel BUG at mm/usercopy.c:102!
Oops: Exception in kernel mode, sig: 5 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA p
