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* [PATCH AUTOSEL 5.4 01/16] Revert "evm: Fix memleak in init_desc"
@ 2022-07-20  1:17 Sasha Levin
  2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 02/16] ARM: rockchip: Add missing of_node_put() in rockchip_suspend_init() Sasha Levin
                   ` (14 more replies)
  0 siblings, 15 replies; 19+ messages in thread
From: Sasha Levin @ 2022-07-20  1:17 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Xiu Jianfeng, Guozihua, Mimi Zohar, Sasha Levin, dmitry.kasatkin,
	jmorris, serge, linux-integrity, linux-security-module

From: Xiu Jianfeng <xiujianfeng@huawei.com>

[ Upstream commit 51dd64bb99e4478fc5280171acd8e1b529eadaf7 ]

This reverts commit ccf11dbaa07b328fa469415c362d33459c140a37.

Commit ccf11dbaa07b ("evm: Fix memleak in init_desc") said there is
memleak in init_desc. That may be incorrect, as we can see, tmp_tfm is
saved in one of the two global variables hmac_tfm or evm_tfm[hash_algo],
then if init_desc is called next time, there is no need to alloc tfm
again, so in the error path of kmalloc desc or crypto_shash_init(desc),
It is not a problem without freeing tmp_tfm.

And also that commit did not reset the global variable to NULL after
freeing tmp_tfm and this makes *tfm a dangling pointer which may cause a
UAF issue.

Reported-by: Guozihua (Scott) <guozihua@huawei.com>
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 security/integrity/evm/evm_crypto.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/security/integrity/evm/evm_crypto.c b/security/integrity/evm/evm_crypto.c
index 25dac691491b..ee6bd945f3d6 100644
--- a/security/integrity/evm/evm_crypto.c
+++ b/security/integrity/evm/evm_crypto.c
@@ -75,7 +75,7 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo)
 {
 	long rc;
 	const char *algo;
-	struct crypto_shash **tfm, *tmp_tfm = NULL;
+	struct crypto_shash **tfm, *tmp_tfm;
 	struct shash_desc *desc;
 
 	if (type == EVM_XATTR_HMAC) {
@@ -120,16 +120,13 @@ static struct shash_desc *init_desc(char type, uint8_t hash_algo)
 alloc:
 	desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(*tfm),
 			GFP_KERNEL);
-	if (!desc) {
-		crypto_free_shash(tmp_tfm);
+	if (!desc)
 		return ERR_PTR(-ENOMEM);
-	}
 
 	desc->tfm = *tfm;
 
 	rc = crypto_shash_init(desc);
 	if (rc) {
-		crypto_free_shash(tmp_tfm);
 		kfree(desc);
 		return ERR_PTR(rc);
 	}
-- 
2.35.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread

end of thread, other threads:[~2022-09-09 18:48 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-07-20  1:17 [PATCH AUTOSEL 5.4 01/16] Revert "evm: Fix memleak in init_desc" Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 02/16] ARM: rockchip: Add missing of_node_put() in rockchip_suspend_init() Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 03/16] x86/kvm/vmx: Make noinstr clean Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 04/16] x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 05/16] x86/bugs: Optimize SPEC_CTRL MSR writes Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 06/16] wifi: mac80211: do not wake queues on a vif that is being stopped Sasha Levin
2022-07-20  1:58   ` Ben Greear
2022-07-20  5:50     ` Johannes Berg
2022-09-09 18:48       ` Ben Greear
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 07/16] wifi: cfg80211: Allow P2P client interface to indicate port authorization Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 08/16] drm: panel-orientation-quirks: Add quirk for the Lenovo Yoga Tablet 2 830 Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 09/16] nilfs2: fix incorrect masking of permission flags for symlinks Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 10/16] ASoC: ti: omap-mcbsp: duplicate sysfs error Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 11/16] ASoC: wm8998: Fix event generation for input mux Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 12/16] ASoC: cs47l92: Fix event generation for OUT1 demux Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 13/16] scsi: target: Fix WRITE_SAME No Data Buffer crash Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 14/16] platform/x86: asus-wmi: Add key mappings Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 15/16] scsi: pm80xx: Fix 'Unknown' max/min linkrate Sasha Levin
2022-07-20  1:17 ` [PATCH AUTOSEL 5.4 16/16] scsi: pm80xx: Set stopped phy's linkrate to Disabled Sasha Levin

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