On Tue, 2020-03-03 at 23:57:08 UTC, Michael Ellerman wrote:
> We received a report of strange kernel faults which turned out to be
> due to a missing KUAP disable in flush_coherent_icache() called
> from flush_icache_range().
>
> The fault looks like:
>
> Kernel attempted to access user page
On Wed, 2020-03-04 at 10:57 +1100, Michael Ellerman wrote:
> We received a report of strange kernel faults which turned out to be
> due to a missing KUAP disable in flush_coherent_icache() called
> from flush_icache_range().
>
> The fault looks like:
>
> Kernel attempted to access user page
Andrew Donnellan writes:
> On 4/3/20 10:57 am, Michael Ellerman wrote:
>> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
>> index ef7b1119b2e2..36a8c7b105ce 100644
>> --- a/arch/powerpc/mm/mem.c
>> +++ b/arch/powerpc/mm/mem.c
>> @@ -373,7 +373,9 @@ static inline bool
On 4/3/20 10:57 am, Michael Ellerman wrote:
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index ef7b1119b2e2..36a8c7b105ce 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -373,7 +373,9 @@ static inline bool flush_coherent_icache(unsigned long addr)
*/
We received a report of strange kernel faults which turned out to be
due to a missing KUAP disable in flush_coherent_icache() called
from flush_icache_range().
The fault looks like:
Kernel attempted to access user page (7fffc30d9c00) - exploit attempt? (uid:
1009)
BUG: Unable to handle
