Not really related to this patch except I was looking at the function:
security/integrity/evm/evm_secfs.c
191 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_EVM_XATTR);
192 if (IS_ERR(ab))
193 return PTR_ERR(ab);
194
195 xattr = kmalloc(sizeof(struct xattr_list), GFP_KERNEL);
196 if (!xattr) {
197 err = -ENOMEM;
198 goto out;
199 }
200
201 xattr->name = memdup_user_nul(buf, count);
202 if (IS_ERR(xattr->name)) {
203 err = PTR_ERR(xattr->name);
204 xattr->name = NULL;
205 goto out;
206 }
207
208 /* Remove any trailing newline */
209 len = strlen(xattr->name);
210 if (xattr->name[len-1] == '\n')
strlen() could be zero, leading to a read underflow here.
211 xattr->name[len-1] = '\0';
212
213 if (strcmp(xattr->name, ".") == 0) {
214 evm_xattrs_locked = 1;
215 newattrs.ia_mode = S_IFREG | 0440;
216 newattrs.ia_valid = ATTR_MODE;
217 inode = evm_xattrs->d_inode;
218 inode_lock(inode);
219 err = simple_setattr(evm_xattrs, &newattrs);
220 inode_unlock(inode);
221 audit_log_format(ab, "locked");
222 if (!err)
223 err = count;
224 goto out;
225 }
regards,
dan carpenter
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