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path-util: teach find_executable_full how to look into the root directory

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When the root parameter in find_executable_full is set, chase_symlinks prefixes this root
to every check of the path name to find the complete path of the execuatble in case the
path provided is not absolute. This is only done for the non NULL root because otherwise
the chase_symlinks function would alter the behavior of some of the callers which would
in turn alter the outputs in a way that is undesirable. The find_execuatble_full function is
invoked by the verify_executable function in analyze-verify.
This commit is contained in:
Maanya Goenka
2021-08-10 10:14:01 -07:00
parent e5ea5c3a17
commit 36f4af0568
5 changed files with 46 additions and 10 deletions
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src/core/execute.c
+1 -1
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@@ -4351,7 +4351,7 @@ static int exec_child(
_cleanup_free_ char *executable = NULL;
_cleanup_close_ int executable_fd = -1;
r = find_executable_full(command->path, false, &executable, &executable_fd);
r = find_executable_full(command->path, /* root= */ NULL, false, &executable, &executable_fd);
if (r < 0) {
if (r != -ENOMEM && (command->flags & EXEC_COMMAND_IGNORE_FAILURE)) {
log_unit_struct_errno(unit, LOG_INFO, r,