File U_05-Rework-to-avoid-problematic-chown.patch of Package slurm.32296

From: Tim Wickberg <tim@schedmd.com>
Date: Wed Oct 11 12:45:25 2023 -0600
Subject: [PATCH 5/19]Rework to avoid problematic chown().
Patch-mainline: Upstream
Git-repo: https://github.com/SchedMD/slurm
Git-commit: bd615ecc073ba8f299032cadc09834de5e2616f7
References: bsc#1216207
Signed-off-by: Egbert Eich <eich@suse.de>

Co-authored-by: Alejandro Sanchez <alex@schedmd.com>
---
 src/plugins/mpi/pmix/pmixp_utils.c | 41 +++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/src/plugins/mpi/pmix/pmixp_utils.c b/src/plugins/mpi/pmix/pmixp_utils.c
index 556633c408..882a2aadd9 100644
--- a/src/plugins/mpi/pmix/pmixp_utils.c
+++ b/src/plugins/mpi/pmix/pmixp_utils.c
@@ -541,6 +541,8 @@ int pmixp_rmdir_recursively(char *path)
 
 int pmixp_mkdir(char *path)
 {
+	char *base = NULL, *newdir = NULL, *slash;
+	int dirfd;
 	mode_t rights = (S_IRUSR | S_IWUSR | S_IXUSR);
 
 	/* NOTE: we need user who owns the job to access PMIx usock
@@ -555,15 +557,48 @@ int pmixp_mkdir(char *path)
 	 * 3. Set 0700 access mode
 	 */
 
-	if (0 != mkdir(path, rights) ) {
+	base = xstrdup(path);
+	/* split into base and new directory name */
+	while ((slash = strrchr(base, '/'))) {
+		/* fix a path with one or more trailing slashes */
+		if (slash[1] == '\0')
+			slash[0] = '\0';
+		else
+			break;
+	}
+
+	if (!slash) {
+		PMIXP_ERROR_STD("Invalid directory \"%s\"", path);
+		xfree(base);
+		return EINVAL;
+	}
+
+	slash[0] = '\0';
+	newdir = slash + 1;
+
+	if ((dirfd = open(base, O_DIRECTORY | O_NOFOLLOW)) < 0) {
+		PMIXP_ERROR_STD("Could not open parent directory \"%s\"", base);
+		xfree(base);
+		return errno;
+	}
+
+	if (mkdirat(dirfd, newdir, rights) < 0) {
 		PMIXP_ERROR_STD("Cannot create directory \"%s\"",
 				path);
+		close(dirfd);
+		xfree(base);
 		return errno;
 	}
 
-	if (chown(path, (uid_t) pmixp_info_jobuid(), (gid_t) -1) < 0) {
-		error("%s: chown(%s): %m", __func__, path);
+	if (fchownat(dirfd, newdir, (uid_t) pmixp_info_jobuid(), (gid_t) -1,
+		     AT_SYMLINK_NOFOLLOW) < 0) {
+		error("%s: fchownath(%s): %m", __func__, path);
+		close(dirfd);
+		xfree(base);
 		return errno;
 	}
+
+	close(dirfd);
+	xfree(base);
 	return 0;
 }