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- Import commit 458220239c69b8e5fe7be480929348daeccb70d1

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e95df40b09 shared/rm-rf: loop over nested directories instead of instead of recursing (CVE-2021-3997 bsc#1194178)
  078e04305d shared/rm_rf: refactor rm_rf() to shorten code a bit
  6d560d0aca shared/rm_rf: refactor rm_rf_children_inner() to shorten code a bit
  6666ff056c localectl: don't omit keymaps files that are symlinks (bsc#1191826)

OBS-URL: https://build.opensuse.org/package/show/Base:System/systemd?expand=0&rev=1220
This commit is contained in:
Franck Bui 2022-01-13 20:57:06 +00:00 committed by Git OBS Bridge
parent 0df2fcc5bc
commit aaaaae32fc
7 changed files with 16 additions and 449 deletions
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66
5000-shared-rm_rf-refactor-rm_rf_children_inner-to-shorte.patch
View File

@ -1,66 +0,0 @@
From 5bc4f2e271c4907af1d3208c5bb33ce795326abc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Tue, 23 Nov 2021 15:55:45 +0100
Subject: [PATCH 5000/5002] shared/rm_rf: refactor rm_rf_children_inner() to
shorten code a bit
---
src/shared/rm-rf.c | 27 +++++++++------------------
1 file changed, 9 insertions(+), 18 deletions(-)
diff --git a/src/shared/rm-rf.c b/src/shared/rm-rf.c
index 19f37e0f19..7362954116 100644
--- a/src/shared/rm-rf.c
+++ b/src/shared/rm-rf.c
@@ -124,7 +124,7 @@ static int rm_rf_children_inner(
const struct stat *root_dev) {
struct stat st;
- int r;
+ int r, q = 0;
assert(fd >= 0);
assert(fname);
@@ -142,7 +142,6 @@ static int rm_rf_children_inner(
if (is_dir) {
_cleanup_close_ int subdir_fd = -1;
- int q;
/* if root_dev is set, remove subdirectories only if device is same */
if (root_dev && st.st_dev != root_dev->st_dev)
@@ -178,23 +177,15 @@ static int rm_rf_children_inner(
* again for each directory */
q = rm_rf_children(TAKE_FD(subdir_fd), flags | REMOVE_PHYSICAL, root_dev);
- r = unlinkat_harder(fd, fname, AT_REMOVEDIR, flags);
- if (r < 0)
- return r;
- if (q < 0)
- return q;
-
- return 1;
-
- } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) {
- r = unlinkat_harder(fd, fname, 0, flags);
- if (r < 0)
- return r;
-
- return 1;
- }
+ } else if (flags & REMOVE_ONLY_DIRECTORIES)
+ return 0;
- return 0;
+ r = unlinkat_harder(fd, fname, is_dir ? AT_REMOVEDIR : 0, flags);
+ if (r < 0)
+ return r;
+ if (q < 0)
+ return q;
+ return 1;
}
int rm_rf_children(
--
2.31.1

98
5001-shared-rm_rf-refactor-rm_rf-to-shorten-code-a-bit.patch
View File

@ -1,98 +0,0 @@
From 8f608df0305355c9b2ddd7c75926a6bd6247e635 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Tue, 23 Nov 2021 16:56:42 +0100
Subject: [PATCH 5001/5002] shared/rm_rf: refactor rm_rf() to shorten code a
bit
---
src/shared/rm-rf.c | 53 ++++++++++++++++++++--------------------------
1 file changed, 23 insertions(+), 30 deletions(-)
diff --git a/src/shared/rm-rf.c b/src/shared/rm-rf.c
index 7362954116..c7d3b8b7ad 100644
--- a/src/shared/rm-rf.c
+++ b/src/shared/rm-rf.c
@@ -250,7 +250,7 @@ int rm_rf_children(
}
int rm_rf(const char *path, RemoveFlags flags) {
- int fd, r;
+ int fd, r, q = 0;
assert(path);
@@ -282,49 +282,42 @@ int rm_rf(const char *path, RemoveFlags flags) {
}
fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
- if (fd < 0) {
+ if (fd >= 0) {
+ /* We have a dir */
+ r = rm_rf_children(fd, flags, NULL);
+
+ if (FLAGS_SET(flags, REMOVE_ROOT))
+ q = RET_NERRNO(rmdir(path));
+ } else {
if (FLAGS_SET(flags, REMOVE_MISSING_OK) && errno == ENOENT)
return 0;
if (!IN_SET(errno, ENOTDIR, ELOOP))
return -errno;
- if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES))
+ if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES) || !FLAGS_SET(flags, REMOVE_ROOT))
return 0;
- if (FLAGS_SET(flags, REMOVE_ROOT)) {
-
- if (!FLAGS_SET(flags, REMOVE_PHYSICAL)) {
- struct statfs s;
-
- if (statfs(path, &s) < 0)
- return -errno;
- if (is_physical_fs(&s))
- return log_error_errno(SYNTHETIC_ERRNO(EPERM),
- "Attempted to remove files from a disk file system under \"%s\", refusing.",
- path);
- }
-
- if (unlink(path) < 0) {
- if (FLAGS_SET(flags, REMOVE_MISSING_OK) && errno == ENOENT)
- return 0;
+ if (!FLAGS_SET(flags, REMOVE_PHYSICAL)) {
+ struct statfs s;
+ if (statfs(path, &s) < 0)
return -errno;
- }
+ if (is_physical_fs(&s))
+ return log_error_errno(SYNTHETIC_ERRNO(EPERM),
+ "Attempted to remove files from a disk file system under \"%s\", refusing.",
+ path);
}
- return 0;
+ r = 0;
+ q = RET_NERRNO(unlink(path));
}
- r = rm_rf_children(fd, flags, NULL);
-
- if (FLAGS_SET(flags, REMOVE_ROOT) &&
- rmdir(path) < 0 &&
- r >= 0 &&
- (!FLAGS_SET(flags, REMOVE_MISSING_OK) || errno != ENOENT))
- r = -errno;
-
- return r;
+ if (r < 0)
+ return r;
+ if (q < 0 && (q != -ENOENT || !FLAGS_SET(flags, REMOVE_MISSING_OK)))
+ return q;
+ return 0;
}
int rm_rf_child(int fd, const char *name, RemoveFlags flags) {
--
2.31.1

273
5002-shared-rm-rf-loop-over-nested-directories-instead-of.patch
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@ -1,273 +0,0 @@
From c561e2eab3b9b759b7592ea1b8168d4f36ede031 Mon Sep 17 00:00:00 2001
From: Franck Bui <fbui@suse.com>
Date: Wed, 5 Jan 2022 15:08:07 +0100
Subject: [PATCH 5002/5002] shared/rm-rf: loop over nested directories instead
of instead of recursing
To remove directory structures, we need to remove the innermost items first,
and then recursively remove higher-level directories. We would recursively
descend into directories and invoke rm_rf_children and rm_rm_children_inner.
This is problematic when too many directories are nested.
Instead, let's create a "TODO" queue. In the the queue, for each level we
hold the DIR* object we were working on, and the name of the directory. This
allows us to leave a partially-processed directory, and restart the removal
loop one level down. When done with the inner directory, we use the name to
unlinkat() it from the parent, and proceed with the removal of other items.
Because the nesting is increased by one level, it is best to view this patch
with -b/--ignore-space-change.
This fixes CVE-2021-3997, https://bugzilla.redhat.com/show_bug.cgi?id=2024639.
The issue was reported and patches reviewed by Qualys Team.
Mauro Matteo Cascella and Riccardo Schirone from Red Hat handled the disclosure.
[fbui: adjust context]
[fbui: fixes CVE-2021-3997]
[fbui: fixes bsc#1194178]
---
src/shared/rm-rf.c | 159 +++++++++++++++++++++++++++++++--------------
1 file changed, 112 insertions(+), 47 deletions(-)
diff --git a/src/shared/rm-rf.c b/src/shared/rm-rf.c
index c7d3b8b7ad..58da213e9f 100644
--- a/src/shared/rm-rf.c
+++ b/src/shared/rm-rf.c
@@ -52,7 +52,6 @@ static int patch_dirfd_mode(
}
int unlinkat_harder(int dfd, const char *filename, int unlink_flags, RemoveFlags remove_flags) {
-
mode_t old_mode;
int r;
@@ -116,12 +115,13 @@ int fstatat_harder(int dfd,
return 0;
}
-static int rm_rf_children_inner(
+static int rm_rf_inner_child(
int fd,
const char *fname,
int is_dir,
RemoveFlags flags,
- const struct stat *root_dev) {
+ const struct stat *root_dev,
+ bool allow_recursion) {
struct stat st;
int r, q = 0;
@@ -141,9 +141,7 @@ static int rm_rf_children_inner(
}
if (is_dir) {
- _cleanup_close_ int subdir_fd = -1;
-
- /* if root_dev is set, remove subdirectories only if device is same */
+ /* If root_dev is set, remove subdirectories only if device is same */
if (root_dev && st.st_dev != root_dev->st_dev)
return 0;
@@ -155,7 +153,6 @@ static int rm_rf_children_inner(
return 0;
if ((flags & REMOVE_SUBVOLUME) && btrfs_might_be_subvol(&st)) {
-
/* This could be a subvolume, try to remove it */
r = btrfs_subvol_remove_fd(fd, fname, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
@@ -169,13 +166,16 @@ static int rm_rf_children_inner(
return 1;
}
- subdir_fd = openat(fd, fname, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
+ if (!allow_recursion)
+ return -EISDIR;
+
+ int subdir_fd = openat(fd, fname, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
if (subdir_fd < 0)
return -errno;
/* We pass REMOVE_PHYSICAL here, to avoid doing the fstatfs() to check the file system type
* again for each directory */
- q = rm_rf_children(TAKE_FD(subdir_fd), flags | REMOVE_PHYSICAL, root_dev);
+ q = rm_rf_children(subdir_fd, flags | REMOVE_PHYSICAL, root_dev);
} else if (flags & REMOVE_ONLY_DIRECTORIES)
return 0;
@@ -188,63 +188,128 @@ static int rm_rf_children_inner(
return 1;
}
+typedef struct TodoEntry {
+ DIR *dir; /* A directory that we were operating on. */
+ char *dirname; /* The filename of that directory itself. */
+} TodoEntry;
+
+static void free_todo_entries(TodoEntry **todos) {
+ for (TodoEntry *x = *todos; x && x->dir; x++) {
+ closedir(x->dir);
+ free(x->dirname);
+ }
+
+ freep(todos);
+}
+
int rm_rf_children(
int fd,
RemoveFlags flags,
const struct stat *root_dev) {
- _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_(free_todo_entries) TodoEntry *todos = NULL;
struct dirent *de;
+ size_t n_todo = 0;
+ _cleanup_free_ char *dirname = NULL; /* Set when we are recursing and want to delete ourselves */
int ret = 0, r;
- assert(fd >= 0);
+ /* Return the first error we run into, but nevertheless try to go on.
+ * The passed fd is closed in all cases, including on failure. */
+
+ for (;;) { /* This loop corresponds to the directory nesting level. */
+ _cleanup_closedir_ DIR *d = NULL;
+
+ if (n_todo > 0) {
+ /* We know that we are in recursion here, because n_todo is set.
+ * We need to remove the inner directory we were operating on. */
+ assert(dirname);
+ r = unlinkat_harder(dirfd(todos[n_todo-1].dir), dirname, AT_REMOVEDIR, flags);
+ if (r < 0 && r != -ENOENT && ret == 0)
+ ret = r;
+ dirname = mfree(dirname);
+
+ /* And now let's back out one level up */
+ n_todo --;
+ d = TAKE_PTR(todos[n_todo].dir);
+ dirname = TAKE_PTR(todos[n_todo].dirname);
+
+ assert(d);
+ fd = dirfd(d); /* Retrieve the file descriptor from the DIR object */
+ assert(fd >= 0);
+ } else {
+ next_fd:
+ assert(fd >= 0);
+ d = fdopendir(fd);
+ if (!d) {
+ safe_close(fd);
+ return -errno;
+ }
+ fd = dirfd(d); /* We donated the fd to fdopendir(). Let's make sure we sure we have
+ * the right descriptor even if it were to internally invalidate the
+ * one we passed. */
+
+ if (!(flags & REMOVE_PHYSICAL)) {
+ struct statfs sfs;
+
+ if (fstatfs(fd, &sfs) < 0)
+ return -errno;
+
+ if (is_physical_fs(&sfs)) {
+ /* We refuse to clean physical file systems with this call, unless
+ * explicitly requested. This is extra paranoia just to be sure we
+ * never ever remove non-state data. */
+
+ _cleanup_free_ char *path = NULL;
+
+ (void) fd_get_path(fd, &path);
+ return log_error_errno(SYNTHETIC_ERRNO(EPERM),
+ "Attempted to remove disk file system under \"%s\", and we can't allow that.",
+ strna(path));
+ }
+ }
+ }
- /* This returns the first error we run into, but nevertheless tries to go on. This closes the passed
- * fd, in all cases, including on failure. */
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+ int is_dir;
- d = fdopendir(fd);
- if (!d) {
- safe_close(fd);
- return -errno;
- }
+ if (dot_or_dot_dot(de->d_name))
+ continue;
- if (!(flags & REMOVE_PHYSICAL)) {
- struct statfs sfs;
+ is_dir = de->d_type == DT_UNKNOWN ? -1 : de->d_type == DT_DIR;
- if (fstatfs(dirfd(d), &sfs) < 0)
- return -errno;
+ r = rm_rf_inner_child(fd, de->d_name, is_dir, flags, root_dev, false);
+ if (r == -EISDIR) {
+ /* Push the current working state onto the todo list */
- if (is_physical_fs(&sfs)) {
- /* We refuse to clean physical file systems with this call, unless explicitly
- * requested. This is extra paranoia just to be sure we never ever remove non-state
- * data. */
+ if (!GREEDY_REALLOC0(todos, n_todo + 2))
+ return log_oom();
- _cleanup_free_ char *path = NULL;
+ _cleanup_free_ char *newdirname = strdup(de->d_name);
+ if (!newdirname)
+ return log_oom();
- (void) fd_get_path(fd, &path);
- return log_error_errno(SYNTHETIC_ERRNO(EPERM),
- "Attempted to remove disk file system under \"%s\", and we can't allow that.",
- strna(path));
- }
- }
+ int newfd = openat(fd, de->d_name,
+ O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
+ if (newfd >= 0) {
+ todos[n_todo++] = (TodoEntry) { TAKE_PTR(d), TAKE_PTR(dirname) };
+ fd = newfd;
+ dirname = TAKE_PTR(newdirname);
- FOREACH_DIRENT_ALL(de, d, return -errno) {
- int is_dir;
+ goto next_fd;
- if (dot_or_dot_dot(de->d_name))
- continue;
+ } else if (errno != -ENOENT && ret == 0)
+ ret = -errno;
- is_dir =
- de->d_type == DT_UNKNOWN ? -1 :
- de->d_type == DT_DIR;
+ } else if (r < 0 && r != -ENOENT && ret == 0)
+ ret = r;
+ }
- r = rm_rf_children_inner(dirfd(d), de->d_name, is_dir, flags, root_dev);
- if (r < 0 && r != -ENOENT && ret == 0)
- ret = r;
- }
+ if (FLAGS_SET(flags, REMOVE_SYNCFS) && syncfs(fd) < 0 && ret >= 0)
+ ret = -errno;
- if (FLAGS_SET(flags, REMOVE_SYNCFS) && syncfs(dirfd(d)) < 0 && ret >= 0)
- ret = -errno;
+ if (n_todo == 0)
+ break;
+ }
return ret;
}
@@ -336,5 +401,5 @@ int rm_rf_child(int fd, const char *name, RemoveFlags flags) {
if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES|REMOVE_SUBVOLUME))
return -EINVAL;
- return rm_rf_children_inner(fd, name, -1, flags, NULL);
+ return rm_rf_inner_child(fd, name, -1, flags, NULL, true);
}
--
2.31.1

3
systemd-v249.7+suse.66.ga54f80116c.tar.xz
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@ -1,3 +0,0 @@
version https://git-lfs.github.com/spec/v1
oid sha256:91b2f8c8492b03612c3148615a39d7553632798941456e7702306837f0118dd8
size 7276848

3
systemd-v249.7+suse.71.g458220239c.tar.xz Normal file
View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:9ba7beb93531d1b148950ba94787d2b7ea4633a9f1f6b4d0fa34aee6298ccdb4
size 7276576

14
systemd.changes
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@ -1,3 +1,13 @@
-------------------------------------------------------------------
Thu Jan 13 20:03:51 UTC 2022 - Franck Bui <fbui@suse.com>
- Import commit 458220239c69b8e5fe7be480929348daeccb70d1
e95df40b09 shared/rm-rf: loop over nested directories instead of instead of recursing (CVE-2021-3997 bsc#1194178)
078e04305d shared/rm_rf: refactor rm_rf() to shorten code a bit
6d560d0aca shared/rm_rf: refactor rm_rf_children_inner() to shorten code a bit
6666ff056c localectl: don't omit keymaps files that are symlinks (bsc#1191826)
-------------------------------------------------------------------
Tue Jan 11 08:06:11 UTC 2022 - Franck Bui <fbui@suse.com>
@ -49,7 +59,7 @@ Wed Nov 24 10:40:01 UTC 2021 - Ludwig Nussel <lnussel@suse.com>
-------------------------------------------------------------------
Mon Nov 22 08:48:12 UTC 2021 - Franck Bui <fbui@suse.com>
- Import commit 523f32df573d459551760b072cb62906f4a2cf23 (merge of 249.7)
- Import commit 523f32df573d459551760b072cb62906f4a2cf23 (merge of v249.7)
For a complete list of changes, visit:
https://github.com/openSUSE/systemd/compare/c34c98712600bc206919ec6ed136195f75ac1967...523f32df573d459551760b072cb62906f4a2cf23
@ -69,7 +79,7 @@ Mon Nov 22 08:43:25 UTC 2021 - Franck Bui <fbui@suse.com>
-------------------------------------------------------------------
Mon Nov 15 09:35:08 UTC 2021 - Franck Bui <fbui@suse.com>
- Import commit 61c79e68381801428c0bc00a56b9e2e9cfa68373 (merge of 249.6)
- Import commit 61c79e68381801428c0bc00a56b9e2e9cfa68373 (merge of v249.6)
bcdeee7b4c virt: Support detection for ARM64 Hyper-V guests (bsc#1186071)
[...]

8
systemd.spec
View File

@ -32,7 +32,7 @@
%endif
%define min_kernel_version 4.5
%define suse_version +suse.66.ga54f80116c
%define suse_version +suse.71.g458220239c
%define _testsuitedir /usr/lib/systemd/tests
%if 0%{?bootstrap}
@ -210,12 +210,6 @@ Patch12: 0012-resolved-create-etc-resolv.conf-symlink-at-runtime.patch
# temporary and should be removed as soon as a fix is merged by
# upstream.
# The following patches address CVE-2021-3997. They will be moved to the git
# repo once the issue will become public and upstream will release them.
Patch5000: 5000-shared-rm_rf-refactor-rm_rf_children_inner-to-shorte.patch
Patch5001: 5001-shared-rm_rf-refactor-rm_rf-to-shorten-code-a-bit.patch
Patch5002: 5002-shared-rm-rf-loop-over-nested-directories-instead-of.patch
%description
Systemd is a system and service manager, compatible with SysV and LSB
init scripts for Linux. systemd provides aggressive parallelization