From a48fda9de94500a3152a56b723d0a64ae236547c Mon Sep 17 00:00:00 2001 From: Dmitry Kasatkin Date: Tue, 28 Oct 2014 13:31:22 +0200 Subject: [PATCH] ima: check xattr value length and type in the ima_inode_setxattr() ima_inode_setxattr() can be called with no value. Function does not check the length so that following command can be used to produce kernel oops: setfattr -n security.ima FOO. This patch fixes it. Changes in v3: * for stable reverted "allow setting hash only in fix or log mode" It will be a separate patch. Changes in v2: * testing validity of xattr type * allow setting hash only in fix or log mode (Mimi) [ 261.562522] BUG: unable to handle kernel NULL pointer dereference at (null) [ 261.564109] IP: [] ima_inode_setxattr+0x3e/0x5a [ 261.564109] PGD 3112f067 PUD 42965067 PMD 0 [ 261.564109] Oops: 0000 [#1] SMP [ 261.564109] Modules linked in: bridge stp llc evdev serio_raw i2c_piix4 button fuse [ 261.564109] CPU: 0 PID: 3299 Comm: setxattr Not tainted 3.16.0-kds+ #2924 [ 261.564109] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 261.564109] task: ffff8800428c2430 ti: ffff880042be0000 task.ti: ffff880042be0000 [ 261.564109] RIP: 0010:[] [] ima_inode_setxattr+0x3e/0x5a [ 261.564109] RSP: 0018:ffff880042be3d50 EFLAGS: 00010246 [ 261.564109] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000015 [ 261.564109] RDX: 0000001500000000 RSI: 0000000000000000 RDI: ffff8800375cc600 [ 261.564109] RBP: ffff880042be3d68 R08: 0000000000000000 R09: 00000000004d6256 [ 261.564109] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88002149ba00 [ 261.564109] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 261.564109] FS: 00007f6c1e219740(0000) GS:ffff88005da00000(0000) knlGS:0000000000000000 [ 261.564109] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 261.564109] CR2: 0000000000000000 CR3: 000000003b35a000 CR4: 00000000000006f0 [ 261.564109] Stack: [ 261.564109] ffff88002149ba00 ffff880042be3df8 0000000000000000 ffff880042be3d98 [ 261.564109] ffffffff812a101b ffff88002149ba00 ffff880042be3df8 0000000000000000 [ 261.564109] 0000000000000000 ffff880042be3de0 ffffffff8116d08a ffff880042be3dc8 [ 261.564109] Call Trace: [ 261.564109] [] security_inode_setxattr+0x48/0x6a [ 261.564109] [] vfs_setxattr+0x6b/0x9f [ 261.564109] [] setxattr+0x122/0x16c [ 261.564109] [] ? mnt_want_write+0x21/0x45 [ 261.564109] [] ? __sb_start_write+0x10f/0x143 [ 261.564109] [] ? mnt_want_write+0x21/0x45 [ 261.564109] [] ? __mnt_want_write+0x48/0x4f [ 261.564109] [] SyS_setxattr+0x6e/0xb0 [ 261.564109] [] system_call_fastpath+0x16/0x1b [ 261.564109] Code: 48 89 f7 48 c7 c6 58 36 81 81 53 31 db e8 73 27 04 00 85 c0 75 28 bf 15 00 00 00 e8 8a a5 d9 ff 84 c0 75 05 83 cb ff eb 15 31 f6 <41> 80 7d 00 03 49 8b 7c 24 68 40 0f 94 c6 e8 e1 f9 ff ff 89 d8 [ 261.564109] RIP [] ima_inode_setxattr+0x3e/0x5a [ 261.564109] RSP [ 261.564109] CR2: 0000000000000000 [ 261.599998] ---[ end trace 39a89a3fc267e652 ]--- Reported-by: Jan Kara Signed-off-by: Dmitry Kasatkin Cc: stable@vger.kernel.org Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_appraise.c | 2 ++ security/integrity/integrity.h | 1 + 2 files changed, 3 insertions(+) diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 9226854..7c8f41e 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -378,6 +378,8 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, result = ima_protect_xattr(dentry, xattr_name, xattr_value, xattr_value_len); if (result == 1) { + if (!xattr_value_len || (xvalue->type >= IMA_XATTR_LAST)) + return -EINVAL; ima_reset_appraise_flags(dentry->d_inode, (xvalue->type == EVM_IMA_XATTR_DIGSIG) ? 1 : 0); result = 0; diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index c0379d1..9d1c2eb 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -61,6 +61,7 @@ enum evm_ima_xattr_type { EVM_XATTR_HMAC, EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, + IMA_XATTR_LAST }; struct evm_ima_xattr_data { -- 2.7.4