diff options
| author | Rick Edgecombe <[email protected]> | 2023-06-12 17:10:54 -0700 |
|---|---|---|
| committer | Dave Hansen <[email protected]> | 2023-08-02 15:01:50 -0700 |
| commit | 2d39a6add422ac78254927ec2194838c33ae4fb2 (patch) | |
| tree | 466fd0ea8271b73a82b2c6d37770321131b9d4cd /lib/test_fortify/write_overflow-memcpy.c | |
| parent | a5f6c2ace9974adf92ce65dacca8126d90adabfe (diff) | |
x86/shstk: Add user-mode shadow stack support
Introduce basic shadow stack enabling/disabling/allocation routines.
A task's shadow stack is allocated from memory with VM_SHADOW_STACK flag
and has a fixed size of min(RLIMIT_STACK, 4GB).
Keep the task's shadow stack address and size in thread_struct. This will
be copied when cloning new threads, but needs to be cleared during exec,
so add a function to do this.
32 bit shadow stack is not expected to have many users and it will
complicate the signal implementation. So do not support IA32 emulation
or x32.
Co-developed-by: Yu-cheng Yu <[email protected]>
Signed-off-by: Yu-cheng Yu <[email protected]>
Signed-off-by: Rick Edgecombe <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Mike Rapoport (IBM) <[email protected]>
Tested-by: Pengfei Xu <[email protected]>
Tested-by: John Allen <[email protected]>
Tested-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/all/20230613001108.3040476-29-rick.p.edgecombe%40intel.com
Diffstat (limited to 'lib/test_fortify/write_overflow-memcpy.c')
0 files changed, 0 insertions, 0 deletions