diff options
| author | Alexander Potapenko <glider@google.com> | 2025-09-30 11:02:37 +0200 |
|---|---|---|
| committer | Alexander Potapenko <glider@google.com> | 2025-10-17 06:51:20 +0000 |
| commit | 6ca4530067ac25a78291b176b6d3dbe6ba592d15 (patch) | |
| tree | 731490cefa5b43b5ccf48f83f77979a829da72c0 /executor/common_kvm_amd64.h | |
| parent | 554d3ef1c24ae1bc3c8c439e8c8f3a9006434244 (diff) | |
executor: introduce DEFINE_GUEST_FN_TO_GPA_FN()
DEFINE_GUEST_FN_TO_GPA_FN() allows to define helper functions to
calculate guest addresses in the host/guest code.
Diffstat (limited to 'executor/common_kvm_amd64.h')
| -rw-r--r-- | executor/common_kvm_amd64.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/executor/common_kvm_amd64.h b/executor/common_kvm_amd64.h index 718d63243..39804b4b8 100644 --- a/executor/common_kvm_amd64.h +++ b/executor/common_kvm_amd64.h @@ -883,6 +883,16 @@ static volatile long syz_kvm_setup_cpu(volatile long a0, volatile long a1, volat #endif #if SYZ_EXECUTOR || __NR_syz_kvm_add_vcpu + +// Post-processing code in pkg/csource/csource.go is very picky and won't let us directly pass +// fail() to DEFINE_GUEST_FN_TO_GPA_FN. +static inline void error_in_executor_fn_guest_addr() +{ + fail("SYZOS: executor_fn_guest_addr: invalid guest address"); +} + +DEFINE_GUEST_FN_TO_GPA_FN(executor_fn_guest_addr, X86_SYZOS_ADDR_EXECUTOR_CODE, error_in_executor_fn_guest_addr()); + static void reset_cpu_regs(int cpufd, int cpu_id, size_t text_size) { struct kvm_regs regs; @@ -890,7 +900,7 @@ static void reset_cpu_regs(int cpufd, int cpu_id, size_t text_size) regs.rflags |= 2; // bit 1 is always set // PC points to the relative offset of guest_main() within the guest code. - regs.rip = X86_SYZOS_ADDR_EXECUTOR_CODE + ((uint64)guest_main - (uint64)&__start_guest); + regs.rip = executor_fn_guest_addr((uintptr_t)guest_main); regs.rsp = X86_SYZOS_ADDR_STACK0; // Pass parameters to guest_main(). regs.rdi = text_size; |