[tip:,x86/sgx] selftests/sgx: Remove incomplete ABI sanitization code in test enclave
Commit Message
The following commit has been merged into the x86/sgx branch of tip:
Commit-ID: 886c5be0b12e89b2905c26c4f24d50ae91f261da
Gitweb: https://git.kernel.org/tip/886c5be0b12e89b2905c26c4f24d50ae91f261da
Author: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be>
AuthorDate: Thu, 05 Oct 2023 17:38:54 +02:00
Committer: Dave Hansen <dave.hansen@linux.intel.com>
CommitterDate: Fri, 08 Dec 2023 10:05:28 -08:00
selftests/sgx: Remove incomplete ABI sanitization code in test enclave
As the selftest enclave is *not* intended for production, simplify the
code by not initializing CPU configuration registers as expected by the
ABI on enclave entry or cleansing caller-save registers on enclave exit.
Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/all/da0cfb1e-e347-f7f2-ac72-aec0ee0d867d@intel.com/
Link: https://lore.kernel.org/all/20231005153854.25566-14-jo.vanbulck%40cs.kuleuven.be
---
tools/testing/selftests/sgx/test_encl_bootstrap.S | 16 ++------------
1 file changed, 3 insertions(+), 13 deletions(-)
@@ -59,21 +59,11 @@ encl_entry_core:
push %rcx # push the address after EENTER
+ # NOTE: as the selftest enclave is *not* intended for production,
+ # simplify the code by not initializing ABI registers on entry or
+ # cleansing caller-save registers on exit.
call encl_body
- /* Clear volatile GPRs, except RAX (EEXIT function). */
- xor %rcx, %rcx
- xor %rdx, %rdx
- xor %rdi, %rdi
- xor %rsi, %rsi
- xor %r8, %r8
- xor %r9, %r9
- xor %r10, %r10
- xor %r11, %r11
-
- # Reset status flags.
- add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1
-
# Prepare EEXIT target by popping the address of the instruction after
# EENTER to RBX.
pop %rbx