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Kernel+LibC: Add sys$recvfd() and sys$sendfd() for fd passing

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These new syscalls allow you to send and receive file descriptors over
a local domain socket. This will enable various privilege separation
techniques and other good stuff. :^)
This commit is contained in:
Andreas Kling 2020-06-24 22:57:37 +02:00
parent cd02144a06
commit d4195672b7
7 changed files with 127 additions and 2 deletions
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4
Kernel/Process.h
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@ -65,6 +65,8 @@ extern VirtualAddress g_return_to_ring3_from_signal_trampoline;
__ENUMERATE_PLEDGE_PROMISE(proc) \
__ENUMERATE_PLEDGE_PROMISE(exec) \
__ENUMERATE_PLEDGE_PROMISE(unix) \
__ENUMERATE_PLEDGE_PROMISE(recvfd) \
__ENUMERATE_PLEDGE_PROMISE(sendfd) \
__ENUMERATE_PLEDGE_PROMISE(fattr) \
__ENUMERATE_PLEDGE_PROMISE(tty) \
__ENUMERATE_PLEDGE_PROMISE(chown) \
@ -316,6 +318,8 @@ public:
int sys$perf_event(int type, FlatPtr arg1, FlatPtr arg2);
int sys$get_stack_bounds(FlatPtr* stack_base, size_t* stack_size);
int sys$ptrace(const Syscall::SC_ptrace_params*);
int sys$sendfd(int sockfd, int fd);
int sys$recvfd(int sockfd);
template<bool sockname, typename Params>
int get_sock_or_peer_name(const Params&);