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* [PATCH v3 1/3] ima: check xattr value length and type in the ima_inode_setxattr()
       [not found] <cover.1414494901.git.d.kasatkin@samsung.com>
@ 2014-10-28 11:31 ` Dmitry Kasatkin
  2014-10-28 11:31 ` [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr() Dmitry Kasatkin
  1 sibling, 0 replies; 4+ messages in thread
From: Dmitry Kasatkin @ 2014-10-28 11:31 UTC (permalink / raw)
  To: zohar, linux-security-module, linux-ima-devel
  Cc: linux-kernel, jack, jmorris, dmitry.kasatkin, Dmitry Kasatkin,
	stable

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: [<ffffffff812af272>] 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:[<ffffffff812af272>]  [<ffffffff812af272>] 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]  [<ffffffff812a101b>] security_inode_setxattr+0x48/0x6a
[  261.564109]  [<ffffffff8116d08a>] vfs_setxattr+0x6b/0x9f
[  261.564109]  [<ffffffff8116d1e0>] setxattr+0x122/0x16c
[  261.564109]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[  261.564109]  [<ffffffff8114d011>] ? __sb_start_write+0x10f/0x143
[  261.564109]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[  261.564109]  [<ffffffff811687c0>] ? __mnt_want_write+0x48/0x4f
[  261.564109]  [<ffffffff8116d3e6>] SyS_setxattr+0x6e/0xb0
[  261.564109]  [<ffffffff81529da9>] 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  [<ffffffff812af272>] ima_inode_setxattr+0x3e/0x5a
[  261.564109]  RSP <ffff880042be3d50>
[  261.564109] CR2: 0000000000000000
[  261.599998] ---[ end trace 39a89a3fc267e652 ]---

Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Cc: stable@vger.kernel.org
---
 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 caa1f6c..0fc9519 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 {
-- 
1.9.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr()
       [not found] <cover.1414494901.git.d.kasatkin@samsung.com>
  2014-10-28 11:31 ` [PATCH v3 1/3] ima: check xattr value length and type in the ima_inode_setxattr() Dmitry Kasatkin
@ 2014-10-28 11:31 ` Dmitry Kasatkin
  2014-10-28 12:28   ` [PATCH v3 1/1] " Dmitry Kasatkin
  2014-10-28 12:33   ` [PATCH v3 3/3] " Dmitry Kasatkin
  1 sibling, 2 replies; 4+ messages in thread
From: Dmitry Kasatkin @ 2014-10-28 11:31 UTC (permalink / raw)
  To: zohar, linux-security-module, linux-ima-devel
  Cc: linux-kernel, jack, jmorris, dmitry.kasatkin, Dmitry Kasatkin,
	stable

evm_inode_setxattr() can be called with no value. The function does not
check the length so that following command can be used to produce the
kernel oops: setfattr -n security.evm FOO. This patch fixes it.

Changes in v2:
* testing for validity of xattr type

[ 1106.396921] BUG: unable to handle kernel NULL pointer dereference at           (null)
[ 1106.398192] IP: [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.399244] PGD 29048067 PUD 290d7067 PMD 0
[ 1106.399953] Oops: 0000 [#1] SMP
[ 1106.400020] Modules linked in: bridge stp llc evdev serio_raw i2c_piix4 button fuse
[ 1106.400020] CPU: 0 PID: 3635 Comm: setxattr Not tainted 3.16.0-kds+ #2936
[ 1106.400020] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1106.400020] task: ffff8800291a0000 ti: ffff88002917c000 task.ti: ffff88002917c000
[ 1106.400020] RIP: 0010:[<ffffffff812af7b8>]  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.400020] RSP: 0018:ffff88002917fd50  EFLAGS: 00010246
[ 1106.400020] RAX: 0000000000000000 RBX: ffff88002917fdf8 RCX: 0000000000000000
[ 1106.400020] RDX: 0000000000000000 RSI: ffffffff818136d3 RDI: ffff88002917fdf8
[ 1106.400020] RBP: ffff88002917fd68 R08: 0000000000000000 R09: 00000000003ec1df
[ 1106.400020] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800438a0a00
[ 1106.400020] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1106.400020] FS:  00007f7dfa7d7740(0000) GS:ffff88005da00000(0000) knlGS:0000000000000000
[ 1106.400020] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1106.400020] CR2: 0000000000000000 CR3: 000000003763e000 CR4: 00000000000006f0
[ 1106.400020] Stack:
[ 1106.400020]  ffff8800438a0a00 ffff88002917fdf8 0000000000000000 ffff88002917fd98
[ 1106.400020]  ffffffff812a1030 ffff8800438a0a00 ffff88002917fdf8 0000000000000000
[ 1106.400020]  0000000000000000 ffff88002917fde0 ffffffff8116d08a ffff88002917fdc8
[ 1106.400020] Call Trace:
[ 1106.400020]  [<ffffffff812a1030>] security_inode_setxattr+0x5d/0x6a
[ 1106.400020]  [<ffffffff8116d08a>] vfs_setxattr+0x6b/0x9f
[ 1106.400020]  [<ffffffff8116d1e0>] setxattr+0x122/0x16c
[ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[ 1106.400020]  [<ffffffff8114d011>] ? __sb_start_write+0x10f/0x143
[ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[ 1106.400020]  [<ffffffff811687c0>] ? __mnt_want_write+0x48/0x4f
[ 1106.400020]  [<ffffffff8116d3e6>] SyS_setxattr+0x6e/0xb0
[ 1106.400020]  [<ffffffff81529da9>] system_call_fastpath+0x16/0x1b
[ 1106.400020] Code: c3 0f 1f 44 00 00 55 48 89 e5 41 55 49 89 d5 41 54 49 89 fc 53 48 89 f3 48 c7 c6 d3 36 81 81 48 89 df e8 18 22 04 00 85 c0 75 07 <41> 80 7d 00 02 74 0d 48 89 de 4c 89 e7 e8 5a fe ff ff eb 03 83
[ 1106.400020] RIP  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.400020]  RSP <ffff88002917fd50>
[ 1106.400020] CR2: 0000000000000000
[ 1106.428061] ---[ end trace ae08331628ba3050 ]---

Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Cc: stable@vger.kernel.org
---
 security/integrity/evm/evm_main.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index b392fe6..1384e4b 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -324,9 +324,14 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 {
 	const struct evm_ima_xattr_data *xattr_data = xattr_value;
 
-	if ((strcmp(xattr_name, XATTR_NAME_EVM) == 0)
-	    && (xattr_data->type == EVM_XATTR_HMAC))
-		return -EPERM;
+	if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
+		if (!xattr_value_len)
+			return -EINVAL;
+		if (xattr_data->type == EVM_XATTR_HMAC)
+			return -EPERM;
+		if (xattr_data->type != EVM_IMA_XATTR_DIGSIG)
+			return -EINVAL;
+	}
 	return evm_protect_xattr(dentry, xattr_name, xattr_value,
 				 xattr_value_len);
 }
-- 
1.9.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [PATCH v3 1/1] evm: check xattr value length and type in evm_inode_setxattr()
  2014-10-28 11:31 ` [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr() Dmitry Kasatkin
@ 2014-10-28 12:28   ` Dmitry Kasatkin
  2014-10-28 12:33   ` [PATCH v3 3/3] " Dmitry Kasatkin
  1 sibling, 0 replies; 4+ messages in thread
From: Dmitry Kasatkin @ 2014-10-28 12:28 UTC (permalink / raw)
  To: zohar, linux-security-module, linux-ima-devel
  Cc: linux-kernel, jack, jmorris, Dmitry Kasatkin, stable

evm_inode_setxattr() can be called with no value. The function does not
check the length so that following command can be used to produce the
kernel oops: setfattr -n security.evm FOO. This patch fixes it.

Changes in v3:
* there is no reason to return different error codes for EVM_XATTR_HMAC
  and non EVM_XATTR_HMAC. Remove unnecessary test then.

Changes in v2:
* testing for validity of xattr type

[ 1106.396921] BUG: unable to handle kernel NULL pointer dereference at           (null)
[ 1106.398192] IP: [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.399244] PGD 29048067 PUD 290d7067 PMD 0
[ 1106.399953] Oops: 0000 [#1] SMP
[ 1106.400020] Modules linked in: bridge stp llc evdev serio_raw i2c_piix4 button fuse
[ 1106.400020] CPU: 0 PID: 3635 Comm: setxattr Not tainted 3.16.0-kds+ #2936
[ 1106.400020] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1106.400020] task: ffff8800291a0000 ti: ffff88002917c000 task.ti: ffff88002917c000
[ 1106.400020] RIP: 0010:[<ffffffff812af7b8>]  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.400020] RSP: 0018:ffff88002917fd50  EFLAGS: 00010246
[ 1106.400020] RAX: 0000000000000000 RBX: ffff88002917fdf8 RCX: 0000000000000000
[ 1106.400020] RDX: 0000000000000000 RSI: ffffffff818136d3 RDI: ffff88002917fdf8
[ 1106.400020] RBP: ffff88002917fd68 R08: 0000000000000000 R09: 00000000003ec1df
[ 1106.400020] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800438a0a00
[ 1106.400020] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 1106.400020] FS:  00007f7dfa7d7740(0000) GS:ffff88005da00000(0000) knlGS:0000000000000000
[ 1106.400020] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1106.400020] CR2: 0000000000000000 CR3: 000000003763e000 CR4: 00000000000006f0
[ 1106.400020] Stack:
[ 1106.400020]  ffff8800438a0a00 ffff88002917fdf8 0000000000000000 ffff88002917fd98
[ 1106.400020]  ffffffff812a1030 ffff8800438a0a00 ffff88002917fdf8 0000000000000000
[ 1106.400020]  0000000000000000 ffff88002917fde0 ffffffff8116d08a ffff88002917fdc8
[ 1106.400020] Call Trace:
[ 1106.400020]  [<ffffffff812a1030>] security_inode_setxattr+0x5d/0x6a
[ 1106.400020]  [<ffffffff8116d08a>] vfs_setxattr+0x6b/0x9f
[ 1106.400020]  [<ffffffff8116d1e0>] setxattr+0x122/0x16c
[ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[ 1106.400020]  [<ffffffff8114d011>] ? __sb_start_write+0x10f/0x143
[ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
[ 1106.400020]  [<ffffffff811687c0>] ? __mnt_want_write+0x48/0x4f
[ 1106.400020]  [<ffffffff8116d3e6>] SyS_setxattr+0x6e/0xb0
[ 1106.400020]  [<ffffffff81529da9>] system_call_fastpath+0x16/0x1b
[ 1106.400020] Code: c3 0f 1f 44 00 00 55 48 89 e5 41 55 49 89 d5 41 54 49 89 fc 53 48 89 f3 48 c7 c6 d3 36 81 81 48 89 df e8 18 22 04 00 85 c0 75 07 <41> 80 7d 00 02 74 0d 48 89 de 4c 89 e7 e8 5a fe ff ff eb 03 83
[ 1106.400020] RIP  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
[ 1106.400020]  RSP <ffff88002917fd50>
[ 1106.400020] CR2: 0000000000000000
[ 1106.428061] ---[ end trace ae08331628ba3050 ]---

Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Cc: stable@vger.kernel.org
---
 security/integrity/evm/evm_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index b392fe6..f589c9a0 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -324,9 +324,12 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
 {
 	const struct evm_ima_xattr_data *xattr_data = xattr_value;
 
-	if ((strcmp(xattr_name, XATTR_NAME_EVM) == 0)
-	    && (xattr_data->type == EVM_XATTR_HMAC))
-		return -EPERM;
+	if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
+		if (!xattr_value_len)
+			return -EINVAL;
+		if (xattr_data->type != EVM_IMA_XATTR_DIGSIG)
+			return -EPERM;
+	}
 	return evm_protect_xattr(dentry, xattr_name, xattr_value,
 				 xattr_value_len);
 }
-- 
1.9.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* Re: [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr()
  2014-10-28 11:31 ` [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr() Dmitry Kasatkin
  2014-10-28 12:28   ` [PATCH v3 1/1] " Dmitry Kasatkin
@ 2014-10-28 12:33   ` Dmitry Kasatkin
  1 sibling, 0 replies; 4+ messages in thread
From: Dmitry Kasatkin @ 2014-10-28 12:33 UTC (permalink / raw)
  To: zohar, linux-security-module, linux-ima-devel
  Cc: linux-kernel, jack, jmorris, dmitry.kasatkin, stable

Sorry, this was the wrong version of the patch.
Please ignore this patch and use what is in the reply to this patch:
[PATCH v3 1/1] evm: check xattr value length and type in
evm_inode_setxattr()

- Dmitry

On 28/10/14 13:31, Dmitry Kasatkin wrote:
> evm_inode_setxattr() can be called with no value. The function does not
> check the length so that following command can be used to produce the
> kernel oops: setfattr -n security.evm FOO. This patch fixes it.
>
> Changes in v2:
> * testing for validity of xattr type
>
> [ 1106.396921] BUG: unable to handle kernel NULL pointer dereference at           (null)
> [ 1106.398192] IP: [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
> [ 1106.399244] PGD 29048067 PUD 290d7067 PMD 0
> [ 1106.399953] Oops: 0000 [#1] SMP
> [ 1106.400020] Modules linked in: bridge stp llc evdev serio_raw i2c_piix4 button fuse
> [ 1106.400020] CPU: 0 PID: 3635 Comm: setxattr Not tainted 3.16.0-kds+ #2936
> [ 1106.400020] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> [ 1106.400020] task: ffff8800291a0000 ti: ffff88002917c000 task.ti: ffff88002917c000
> [ 1106.400020] RIP: 0010:[<ffffffff812af7b8>]  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
> [ 1106.400020] RSP: 0018:ffff88002917fd50  EFLAGS: 00010246
> [ 1106.400020] RAX: 0000000000000000 RBX: ffff88002917fdf8 RCX: 0000000000000000
> [ 1106.400020] RDX: 0000000000000000 RSI: ffffffff818136d3 RDI: ffff88002917fdf8
> [ 1106.400020] RBP: ffff88002917fd68 R08: 0000000000000000 R09: 00000000003ec1df
> [ 1106.400020] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800438a0a00
> [ 1106.400020] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [ 1106.400020] FS:  00007f7dfa7d7740(0000) GS:ffff88005da00000(0000) knlGS:0000000000000000
> [ 1106.400020] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1106.400020] CR2: 0000000000000000 CR3: 000000003763e000 CR4: 00000000000006f0
> [ 1106.400020] Stack:
> [ 1106.400020]  ffff8800438a0a00 ffff88002917fdf8 0000000000000000 ffff88002917fd98
> [ 1106.400020]  ffffffff812a1030 ffff8800438a0a00 ffff88002917fdf8 0000000000000000
> [ 1106.400020]  0000000000000000 ffff88002917fde0 ffffffff8116d08a ffff88002917fdc8
> [ 1106.400020] Call Trace:
> [ 1106.400020]  [<ffffffff812a1030>] security_inode_setxattr+0x5d/0x6a
> [ 1106.400020]  [<ffffffff8116d08a>] vfs_setxattr+0x6b/0x9f
> [ 1106.400020]  [<ffffffff8116d1e0>] setxattr+0x122/0x16c
> [ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
> [ 1106.400020]  [<ffffffff8114d011>] ? __sb_start_write+0x10f/0x143
> [ 1106.400020]  [<ffffffff811687e8>] ? mnt_want_write+0x21/0x45
> [ 1106.400020]  [<ffffffff811687c0>] ? __mnt_want_write+0x48/0x4f
> [ 1106.400020]  [<ffffffff8116d3e6>] SyS_setxattr+0x6e/0xb0
> [ 1106.400020]  [<ffffffff81529da9>] system_call_fastpath+0x16/0x1b
> [ 1106.400020] Code: c3 0f 1f 44 00 00 55 48 89 e5 41 55 49 89 d5 41 54 49 89 fc 53 48 89 f3 48 c7 c6 d3 36 81 81 48 89 df e8 18 22 04 00 85 c0 75 07 <41> 80 7d 00 02 74 0d 48 89 de 4c 89 e7 e8 5a fe ff ff eb 03 83
> [ 1106.400020] RIP  [<ffffffff812af7b8>] evm_inode_setxattr+0x2a/0x48
> [ 1106.400020]  RSP <ffff88002917fd50>
> [ 1106.400020] CR2: 0000000000000000
> [ 1106.428061] ---[ end trace ae08331628ba3050 ]---
>
> Reported-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
> Cc: stable@vger.kernel.org
> ---
>  security/integrity/evm/evm_main.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
> index b392fe6..1384e4b 100644
> --- a/security/integrity/evm/evm_main.c
> +++ b/security/integrity/evm/evm_main.c
> @@ -324,9 +324,14 @@ int evm_inode_setxattr(struct dentry *dentry, const char *xattr_name,
>  {
>  	const struct evm_ima_xattr_data *xattr_data = xattr_value;
>  
> -	if ((strcmp(xattr_name, XATTR_NAME_EVM) == 0)
> -	    && (xattr_data->type == EVM_XATTR_HMAC))
> -		return -EPERM;
> +	if (strcmp(xattr_name, XATTR_NAME_EVM) == 0) {
> +		if (!xattr_value_len)
> +			return -EINVAL;
> +		if (xattr_data->type == EVM_XATTR_HMAC)
> +			return -EPERM;
> +		if (xattr_data->type != EVM_IMA_XATTR_DIGSIG)
> +			return -EINVAL;
> +	}
>  	return evm_protect_xattr(dentry, xattr_name, xattr_value,
>  				 xattr_value_len);
>  }


^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-10-28 12:33 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <cover.1414494901.git.d.kasatkin@samsung.com>
2014-10-28 11:31 ` [PATCH v3 1/3] ima: check xattr value length and type in the ima_inode_setxattr() Dmitry Kasatkin
2014-10-28 11:31 ` [PATCH v3 3/3] evm: check xattr value length and type in evm_inode_setxattr() Dmitry Kasatkin
2014-10-28 12:28   ` [PATCH v3 1/1] " Dmitry Kasatkin
2014-10-28 12:33   ` [PATCH v3 3/3] " Dmitry Kasatkin

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