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authorStefan Berger <stefanb@linux.ibm.com>2024-02-23 12:25:05 -0500
committerMimi Zohar <zohar@linux.ibm.com>2024-04-09 17:14:57 -0400
commit3253804773c0613a1bad5bfea2edf172b760d8b6 (patch)
treed3f6b1b665725dbf66221496577d3030b9a9692f /security
parentc21632b66895eb23c05e4eeedb68128fb243d168 (diff)
security: allow finer granularity in permitting copy-up of security xattrs
Copying up xattrs is solely based on the security xattr name. For finer granularity add a dentry parameter to the security_inode_copy_up_xattr hook definition, allowing decisions to be based on the xattr content as well. Co-developed-by: Mimi Zohar <zohar@linux.ibm.com> Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Acked-by: Amir Goldstein <amir73il@gmail.com> Acked-by: Paul Moore <paul@paul-moore.com> (LSM,SELinux) Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/evm/evm_main.c2
-rw-r--r--security/security.c5
-rw-r--r--security/selinux/hooks.c2
-rw-r--r--security/smack/smack_lsm.c2
4 files changed, 6 insertions, 5 deletions
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 81dbade5b9b3..b0a862bfd74a 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -946,7 +946,7 @@ static void evm_inode_post_setattr(struct mnt_idmap *idmap,
evm_update_evmxattr(dentry, NULL, NULL, 0);
}
-static int evm_inode_copy_up_xattr(const char *name)
+static int evm_inode_copy_up_xattr(struct dentry *src, const char *name)
{
if (strcmp(name, XATTR_NAME_EVM) == 0)
return 1; /* Discard */
diff --git a/security/security.c b/security/security.c
index 0a9a0ac3f266..e5da848c50b9 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2628,6 +2628,7 @@ EXPORT_SYMBOL(security_inode_copy_up);
/**
* security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
+ * @src: union dentry of copy-up file
* @name: xattr name
*
* Filter the xattrs being copied up when a unioned file is copied up from a
@@ -2638,7 +2639,7 @@ EXPORT_SYMBOL(security_inode_copy_up);
* if the security module does not know about attribute, or a negative
* error code to abort the copy up.
*/
-int security_inode_copy_up_xattr(const char *name)
+int security_inode_copy_up_xattr(struct dentry *src, const char *name)
{
int rc;
@@ -2647,7 +2648,7 @@ int security_inode_copy_up_xattr(const char *name)
* xattr), -EOPNOTSUPP if it does not know anything about the xattr or
* any other error code in case of an error.
*/
- rc = call_int_hook(inode_copy_up_xattr, name);
+ rc = call_int_hook(inode_copy_up_xattr, src, name);
if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
return rc;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3448454c82d0..9f018f51e47a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3530,7 +3530,7 @@ static int selinux_inode_copy_up(struct dentry *src, struct cred **new)
return 0;
}
-static int selinux_inode_copy_up_xattr(const char *name)
+static int selinux_inode_copy_up_xattr(struct dentry *dentry, const char *name)
{
/* The copy_up hook above sets the initial context on an inode, but we
* don't then want to overwrite it by blindly copying all the lower
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 146667937811..79d8dc633b9a 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4885,7 +4885,7 @@ static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
return 0;
}
-static int smack_inode_copy_up_xattr(const char *name)
+static int smack_inode_copy_up_xattr(struct dentry *src, const char *name)
{
/*
* Return 1 if this is the smack access Smack attribute.