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repart: when keeping ref to backing inode/devnode, use fd_reopen() rathern than F_DUPFD
Via the "backing_fd" variable we intend to pin the backing inode through our entire code. So far we typically created the fd via F_DUPFD_CLOEXEC, and thus any BSD lock taken one the original fd is shared with our backing_fd reference. And if the origina fd is closed but our backing_fd is not, we'll keep the BSD lock open, even if we then reopen the block device through the backing_fd. If hit, this results in a deadlock. Let's fix that by creating the backing_fd via fd_reopen(), so that the locks are no longer shared, and if the original fd is closed all BSD locks on it that are in effect are auto-released. (Note the deadlock is only triggered if multiple operations on the same backing inode are executed, i.e. factory reset, resize and applying of partitions.) Replaces: #24181
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@ -1612,9 +1612,9 @@ static int context_load_partition_table(
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if (*backing_fd < 0) {
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/* If we have no fd referencing the device yet, make a copy of the fd now, so that we have one */
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*backing_fd = fcntl(fdisk_get_devfd(c), F_DUPFD_CLOEXEC, 3);
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*backing_fd = fd_reopen(fdisk_get_devfd(c), O_RDONLY|O_CLOEXEC);
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if (*backing_fd < 0)
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return log_error_errno(errno, "Failed to duplicate fdisk fd: %m");
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return log_error_errno(*backing_fd, "Failed to duplicate fdisk fd: %m");
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}
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/* Tell udev not to interfere while we are processing the device */
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