riscv/qemu - qemu - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Eric Blake	7ade2b186d	systemd: Also clear LISTEN_FDNAMES during systemd socket activation Some time after systemd documented LISTEN_PID and LISTEN_FDS for socket activation, they later added LISTEN_FDNAMES; now documented at: https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html In particular, look at the implementation of sd_listen_fds_with_names(): https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-daemon.c If we ever pass LISTEN_PID=xxx and LISTEN_FDS=n to a child process, but leave LISTEN_FDNAMES=... unchanged as inherited from our parent process, then our child process using sd_listen_fds_with_names() might see a mismatch in the number of names (unexpected -EINVAL failure), or even if the number of names matches the values of those names may be unexpected (with even less predictable results). Usually, this is not an issue - the point of LISTEN_PID is to tell systemd socket activation to ignore all other LISTEN_* if they were not directed to this particular pid. But if we end up consuming a socket directed to this qemu process, and later decide to spawn a child process that also needs systemd socket activation, we must ensure we are not leaking any stale systemd variables through to that child. The easiest way to do this is to wipe ALL LISTEN_* variables at the time we consume a socket, even if we do not yet care about a LISTEN_FDNAMES passed in from the parent process. See also https://lists.freedesktop.org/archives/systemd-devel/2023-March/048920.html Thanks: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20230324153349.1123774-1-eblake@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>	3 years ago
Eric Blake	474a6e64f2	tools: Fix use of fcntl(F_SETFD) during socket activation Blindly setting FD_CLOEXEC without a read-modify-write will inadvertently clear any other intentionally-set bits, such as a proposed new bit for designating a fd that must behave in 32-bit mode. However, we cannot use our wrapper qemu_set_cloexec(), because that wrapper intentionally abort()s on failure, whereas the probe here intentionally tolerates failure to deal with incorrect socket activation gracefully. Instead, fix the code to do the proper read-modify-write. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200420175309.75894-3-eblake@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>	6 years ago
Thomas Huth	372a87a1d9	Do not use %m in common code to print error messages The %m format specifier is an extension from glibc - and when compiling QEMU for NetBSD, the compiler correctly complains, e.g.: /home/qemu/qemu-test.ELjfrQ/src/util/main-loop.c: In function 'sigfd_handler': /home/qemu/qemu-test.ELjfrQ/src/util/main-loop.c:64:13: warning: %m is only allowed in syslog(3) like functions [-Wformat=] printf("read from sigfd returned %zd: %m\n", len); ^ Let's use g_strerror() here instead, which is an easy-to-use wrapper around the thread-safe strerror_r() function. While we're at it, also convert the "printf()" in main-loop.c into the preferred "error_report()". Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20191018130716.25438-1-thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>	7 years ago
Paolo Bonzini	53fabd4b86	qemu-ga: obey LISTEN_PID when using systemd socket activation qemu-ga's socket activation support was not obeying the LISTEN_PID environment variable, which avoids that a process uses a socket-activation file descriptor meant for its parent. Mess can for example ensue if a process forks a children before consuming the socket-activation file descriptor and therefore setting O_CLOEXEC on it. Luckily, qemu-nbd also got socket activation code, and its copy does support LISTEN_PID. Some extra fixups are needed to ensure that the code can be used for both, but that's what this patch does. The main change is to replace get_listen_fds's "consume" argument with the FIRST_SOCKET_ACTIVATION_FD macro from the qemu-nbd code. Cc: "Richard W.M. Jones" <rjones@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>	9 years ago