Correctly configure landlock for older ABIs
For example, with landlock ABI < 3, LANDLOCK_ACCESS_FS_TRUNCATE is not set in ruleset_attr.handled_access_fs, so it should not be set in path_beneath.allowed_access either. Otherwise, landlock_add_rule fails with -EINVAL, and pacman complains: > error: restricting filesystem access failed because the landlock rule for the temporary download directory could not be added! The change is tested on Debian Bookworm kernel linux-image-6.1.0-25-cloud-amd64 6.1.106-3.
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@ -150,6 +150,9 @@ bool _alpm_sandbox_fs_restrict_writes_to(alpm_handle_t *handle, const char *path
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path_beneath.parent_fd = open(path, O_PATH | O_CLOEXEC | O_DIRECTORY);
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path_beneath.allowed_access = _LANDLOCK_ACCESS_FS_READ | _LANDLOCK_ACCESS_FS_WRITE | _LANDLOCK_ACCESS_FS_TRUNCATE;
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/* make sure allowed_access is a subset of handled_access_fs, which may change for older landlock ABI */
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path_beneath.allowed_access &= ruleset_attr.handled_access_fs;
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if(landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0) == 0) {
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if(landlock_restrict_self(ruleset_fd, 0)) {
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_alpm_log(handle, ALPM_LOG_ERROR, _("restricting filesystem access failed because the landlock ruleset could not be applied!\n"));
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