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Commit 869ab514 authored by Stephen Smalley's avatar Stephen Smalley Committed by James Morris
Browse files

SELinux: more GFP_NOFS fixups to prevent selinux from re-entering the fs code 



More cases where SELinux must not re-enter the fs code. Called from the
d_instantiate security hook.

Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent ff09e2af

security/selinux/hooks.c

+4 −3
Original line number Diff line number Diff line
@@ -1143,7 +1143,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent 
		}



		len = INITCONTEXTLEN;

		context = kmalloc(len, GFP_KERNEL);

		context = kmalloc(len, GFP_NOFS);

		if (!context) {

			rc = -ENOMEM;

			dput(dentry);
@@ -1161,7 +1161,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent 
			}

			kfree(context);

			len = rc;

			context = kmalloc(len, GFP_KERNEL);

			context = kmalloc(len, GFP_NOFS);

			if (!context) {

				rc = -ENOMEM;

				dput(dentry);
@@ -1185,7 +1185,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent 
			rc = 0;

		} else {

			rc = security_context_to_sid_default(context, rc, &sid,

			                                     sbsec->def_sid);

							     sbsec->def_sid,

							     GFP_NOFS);

			if (rc) {

				printk(KERN_WARNING "%s:  context_to_sid(%s) "

				       "returned %d for dev=%s ino=%ld\n",

security/selinux/include/security.h

+2 −1
Original line number Diff line number Diff line
@@ -86,7 +86,8 @@ int security_sid_to_context(u32 sid, char **scontext, 
int security_context_to_sid(char *scontext, u32 scontext_len,

	u32 *out_sid);



int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *out_sid, u32 def_sid);

int security_context_to_sid_default(char *scontext, u32 scontext_len,

				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);



int security_get_user_sids(u32 callsid, char *username,

			   u32 **sids, u32 *nel);

security/selinux/ss/services.c

+7 −5
Original line number Diff line number Diff line
@@ -680,7 +680,8 @@ int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) 


}



static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)

static int security_context_to_sid_core(char *scontext, u32 scontext_len,

					u32 *sid, u32 def_sid, gfp_t gfp_flags)

{

	char *scontext2;

	struct context context;
@@ -709,7 +710,7 @@ static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *s 
	   null suffix to the copy to avoid problems with the existing

	   attr package, which doesn't view the null terminator as part

	   of the attribute value. */

	scontext2 = kmalloc(scontext_len+1,GFP_KERNEL);

	scontext2 = kmalloc(scontext_len+1, gfp_flags);

	if (!scontext2) {

		rc = -ENOMEM;

		goto out;
@@ -809,7 +810,7 @@ static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *s 
int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)

{

	return security_context_to_sid_core(scontext, scontext_len,

	                                    sid, SECSID_NULL);

					    sid, SECSID_NULL, GFP_KERNEL);

}



/**
@@ -829,10 +830,11 @@ int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) 
 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient

 * memory is available, or 0 on success.

 */

int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)

int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid,

				    u32 def_sid, gfp_t gfp_flags)

{

	return security_context_to_sid_core(scontext, scontext_len,

	                                    sid, def_sid);

					    sid, def_sid, gfp_flags);

}



static int compute_sid_handle_invalid_context(