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Kernel: Allow fchmod() and fchown() on pre-bind() local sockets

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In order to ensure a specific owner and mode when the local socket
filesystem endpoint is instantiated, we need to be able to call
fchmod() and fchown() on a socket fd between socket() and bind().

This is because until we call bind(), there is no filesystem inode
for the socket yet.
This commit is contained in:
Andreas Kling 2020-01-03 20:14:56 +01:00
parent 4abbedb6e4
commit d84299c7be
8 changed files with 57 additions and 13 deletions
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6
Kernel/Net/LocalSocket.h
View file

@ -30,6 +30,8 @@ public:
virtual ssize_t sendto(FileDescription&, const void*, size_t, int, const sockaddr*, socklen_t) override;
virtual ssize_t recvfrom(FileDescription&, void*, size_t, int flags, sockaddr*, socklen_t*) override;
virtual KResult getsockopt(FileDescription&, int level, int option, void*, socklen_t*) override;
virtual KResult chown(uid_t, gid_t) override;
virtual KResult chmod(mode_t) override;
private:
explicit LocalSocket(int type);
@ -43,6 +45,10 @@ private:
// An open socket file on the filesystem.
RefPtr<FileDescription> m_file;
uid_t m_prebind_uid { 0 };
uid_t m_prebind_gid { 0 };
mode_t m_prebind_mode { 0 };
// A single LocalSocket is shared between two file descriptions
// on the connect side and the accept side; so we need to store
// an additional role for the connect side and differentiate