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Restrict the arm64 supervisor all instructions to only allow a zero

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immediate value for system calls. We may wish to use other values in the
future for other purposes.

MFC after:	1 week
Sponsored by:	DARPA, AFRL
This commit is contained in:
Andrew Turner 2017-04-20 15:53:20 +00:00
parent be4bf62684
commit 52a680fb22
1 changed files with 7 additions and 2 deletions
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9
sys/arm64/arm64/trap.c
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@ -135,8 +135,13 @@ svc_handler(struct thread *td, struct trapframe *frame)
struct syscall_args sa;
int error;
error = syscallenter(td, &sa);
syscallret(td, error, &sa);
if ((frame->tf_esr & ESR_ELx_ISS_MASK) == 0) {
error = syscallenter(td, &sa);
syscallret(td, error, &sa);
} else {
call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr);
userret(td, frame);
}
}
static void