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mitm: fix long-standing C descriptor issue.

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This commit is contained in:
Michael Scire 2019-09-24 21:43:18 -07:00
parent ec2ea1e850
commit 6815ccdf68
1 changed files with 17 additions and 0 deletions
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17
include/stratosphere/mitm/mitm_session.hpp
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@ -80,6 +80,23 @@ class MitmSession final : public ServiceSession {
}
Result ForwardRequest(IpcResponseContext *ctx) {
/* Mitm forward specific preprocessing. */
if (ctx->request.NumStaticsOut) {
u32 *cmdbuf = (u32 *)armGetTls();
/* Overwrite the number of C descriptors to only use a single buffer. */
cmdbuf[1] = (cmdbuf[1] & (~u32(0xF << 10))) | (0x2 << 10);
IpcStaticRecvDescriptor *c_desc = (IpcStaticRecvDescriptor *)(reinterpret_cast<uintptr_t>(ctx->request.RawWithoutPadding) + ctx->request.RawSize);
/* Don't write out of bounds, though this should never happen. */
if (reinterpret_cast<uintptr_t>(c_desc) + sizeof(*c_desc) <= reinterpret_cast<uintptr_t>(cmdbuf) + 0x100) {
uintptr_t ptr = reinterpret_cast<uintptr_t>(this->pointer_buffer.data());
c_desc->Addr = ptr;
c_desc->Packed = (ptr >> 32) | (this->pointer_buffer.size() << 16);
} else {
std::abort();
}
}
/* Dispatch forwards. */
R_TRY(serviceIpcDispatch(this->forward_service.get()));