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gdbstub: Try unlinking the unix socket before binding

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In case an emulated process execve()s another emulated process, bind()
will fail, because the socket already exists. So try deleting it. Use
the existing unix_listen() function which does this. Link qemu-user
with qemu-sockets.c and add the monitor_get_fd() stub.

Note that it is not possible to handle this in do_execv(): deleting
gdbserver_user_state.socket_path before safe_execve() is not correct,
because the latter may fail, and afterwards we may lose control.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250117001542.8290-3-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250207153112.3939799-12-alex.bennee@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2025-02-07 15:31:06 +00:00 • committed by Alex Bennée
parent 9853485dd4
commit fccb744f41
4 changed files with 16 additions and 26 deletions
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2
stubs/meson.build
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@ -61,6 +61,8 @@ if have_user
if not have_system
stub_ss.add(files('qdev.c'))
endif
stub_ss.add(files('monitor-fd.c'))
endif
if have_system

9
stubs/monitor-fd.c Normal file
View file

@ -0,0 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "qemu/osdep.h"
#include "monitor/monitor.h"
int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp)
{
abort();
}