Linus Torvalds writes: (Summary) wrote:
This is the LDT remap area.
This is RSVD + P, so it's a system read access that got a protection fault due to reserved bits.
fault due to reserved bits.
it's user space that does a system access.
That's normal - something loading a segment in user space, and thus accessing the system LDT.
accessing the system LDT.
But:
But:
[...]
[ 884.496588] BUG: unable to handle kernel paging request at fffffe8000010030 This is the LDT remap area.This is the LDT remap area.
[...]
[ 884.496614] Oops: 0009 [#1] SMP KASAN PTIThis is RSVD + P, so it's a system read access that got a protection fault due to reserved bits.
fault due to reserved bits.
[...]
[ 884.496745] RSP: 002b:00007ffd805b56d8 EFLAGS: 00010246 This is not actually a kernel paging request, it's all user space, but it's user space that does a system access.it's user space that does a system access.
That's normal - something loading a segment in user space, and thus accessing the system LDT.
accessing the system LDT.
But:
But:
[...]
[ 884.496601] PGD 372870067 P4D 372870067 PUD 346e84067 PMD 34005f067 PTE ffffffffffffffff WTF?