mm-damon-dbgfs-check-if-rm_contexts-input-is-for-a-real-context.patch removed from -mm tree

The quilt patch titled
Subject: mm/damon/dbgfs: check if rm_contexts input is for a real context
has been removed from the -mm tree. Its filename was
mm-damon-dbgfs-check-if-rm_contexts-input-is-for-a-real-context.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <[email protected]>
Subject: mm/damon/dbgfs: check if rm_contexts input is for a real context
Date: Mon, 7 Nov 2022 16:50:00 +0000

A user could write a name of a file under 'damon/' debugfs directory, which is not a user-created context, to 'rm_contexts' file. In the case, 'dbgfs_rm_context()' just assumes it's the valid DAMON context directory only if a file of the name exist. As a result, invalid memory access could happen as below. Fix the bug by checking if the given input is for a directory. This check can filter out non-context inputs because directories under 'damon/' debugfs directory can be created via only 'mk_contexts' file.

This bug has found by syzbot[1].

[1] https://lore.kernel.org/damon/[email protected]/

---

 mm/damon/dbgfs.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -890,6 +890,7 @@ out:
 static int dbgfs_rm_context(char *name)
 {
 	struct dentry *root, *dir, **new_dirs;
+	struct inode *inode;
 	struct damon_ctx **new_ctxs;
 	int i, j;
 	int ret = 0;

@@ -905,6 +906,12 @@ static int dbgfs_rm_context(char *name)
 	if (!dir)
 		return -ENOENT;
 
+	inode = d_inode(dir);
+	if (!S_ISDIR(inode->i_mode)) {
+		ret = -EINVAL;
+		goto out_dput;
+	}
+
 	new_dirs = kmalloc_array(dbgfs_nr_ctxs - 1, sizeof(*dbgfs_dirs),
 			GFP_KERNEL);
 	if (!new_dirs) {

_

Patches currently in -mm which might be from [email protected] are

mm-damon-core-split-out-damos-charged-region-skip-logic-into-a-new-function.patch mm-damon-core-split-damos-application-logic-into-a-new-function.patch mm-damon-core-split-out-scheme-stat-update-logic-into-a-new-function.patch mm-damon-core-split-out-scheme-quota-adjustment-logic-into-a-new-function.patch mm-damon-sysfs-use-damon_addr_range-for-regions-start-and-end-values.patch mm-damon-sysfs-remove-parameters-of-damon_sysfs_region_alloc.patch mm-damon-sysfs-move-sysfs_lock-to-common-module.patch mm-damon-sysfs-move-unsigned-long-range-directory-to-common-module.patch mm-damon-sysfs-split-out-kdamond-independent-schemes-stats-update-logic-into-a-new-function.patch mm-damon-sysfs-split-out-schemes-directory-implementation-to-separate-file.patch mm-damon-modules-deduplicate-init-steps-for-damon-context-setup.patch mm-damon-reclaimlru_sort-remove-unnecessarily-included-headers.patch mm-damon-reclaim-enable-and-disable-synchronously.patch selftests-damon-add-tests-for-damon_reclaims-enabled-parameter.patch mm-damon-lru_sort-enable-and-disable-synchronously.patch selftests-damon-add-tests-for-damon_lru_sorts-enabled-parameter.patch docs-admin-guide-mm-damon-usage-describe-the-rules-of-sysfs-region-directories.patch docs-admin-guide-mm-damon-usage-fix-wrong-usage-example-of-init_regions-file.patch mm-damon-core-add-a-callback-for-scheme-target-regions-check.patch mm-damon-sysfs-schemes-implement-schemes-tried_regions-directory.patch mm-damon-sysfs-schemes-implement-scheme-region-directory.patch mm-damon-sysfs-implement-damos-tried-regions-update-command.patch mm-damon-sysfs-schemes-implement-damos-tried-regions-clear-command.patch tools-selftets-damon-sysfs-test-tried_regions-directory-existence.patch docs-admin-guide-mm-damon-usage-document-schemes-s-tried_regions-sysfs-directory.patch docs-abi-damon-document-schemes-s-tried_regions-sysfs-directory.patch selftests-damon-test-non-context-inputs-to-rm_contexts-file.patch