* [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto()
@ 2022-07-04 0:59 Jianglei Nie
2022-07-07 3:19 ` Mimi Zohar
0 siblings, 1 reply; 4+ messages in thread
From: Jianglei Nie @ 2022-07-04 0:59 UTC (permalink / raw)
To: zohar, dmitry.kasatkin, jmorris, serge
Cc: linux-integrity, linux-security-module, linux-kernel, Jianglei Nie
ima_init_crypto() allocates a memory chunk for "ima_algo_array" with
kcalloc(). When some errors occur, the function jumps to "out_array"
and releases the "ima_algo_array[i].tfm". But "ima_algo_array" is
not released, which will lead to a memory leak.
We can release the ima_algo_array with kfree() when some errors occur
to fix the memory leak.
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
---
security/integrity/ima/ima_crypto.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index a7206cc1d7d1..64499056648a 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -205,6 +205,7 @@ int __init ima_init_crypto(void)
crypto_free_shash(ima_algo_array[i].tfm);
}
+ kfree(ima_algo_array);
out:
crypto_free_shash(ima_shash_tfm);
return rc;
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto()
2022-07-04 0:59 [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto() Jianglei Nie
@ 2022-07-07 3:19 ` Mimi Zohar
0 siblings, 0 replies; 4+ messages in thread
From: Mimi Zohar @ 2022-07-07 3:19 UTC (permalink / raw)
To: Jianglei Nie, dmitry.kasatkin, jmorris, serge
Cc: linux-integrity, linux-security-module, linux-kernel
Hi Jianglei,
Thank you for the patch.
On Mon, 2022-07-04 at 08:59 +0800, Jianglei Nie wrote:
> ima_init_crypto() allocates a memory chunk for "ima_algo_array" with
> kcalloc(). When some errors occur, the function jumps to "out_array"
> and releases the "ima_algo_array[i].tfm". But "ima_algo_array" is
> not released, which will lead to a memory leak.
There's too much low level code details in the above paragraph. The
patch description should be written from a higher level perspective.
Refer to the original commit 6d94809af6b0 ("ima: Allocate and
initialize tfm for each PCR bank") for an example.
>
> We can release the ima_algo_array with kfree() when some errors occur
> to fix the memory leak.
Please re-word the above sentence in the imperative mode. Refer to
Documentation/process/submitting-patches.rst for an example.
thanks,
Mimi
>
> Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto()
2022-07-11 7:22 Jianglei Nie
@ 2022-07-11 12:04 ` Mimi Zohar
0 siblings, 0 replies; 4+ messages in thread
From: Mimi Zohar @ 2022-07-11 12:04 UTC (permalink / raw)
To: Jianglei Nie, dmitry.kasatkin, jmorris, serge
Cc: linux-integrity, linux-security-module, linux-kernel
On Mon, 2022-07-11 at 15:22 +0800, Jianglei Nie wrote:
> This patch adds the missing kfree() for ima_algo_array allocated by
> kcalloc() to avoid potential memory leak.
Missing is the reason that ima_algo_array is being freed.
Perhaps something like,
"On failure to allocate the SHA1 tfm, IMA fails to initialize and exits
without freeing the ima_algo_array. Add the missing kfree() for
ima_algo_array to avoid the potential memory leak."
thanks,
Mimi
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto()
@ 2022-07-11 7:22 Jianglei Nie
2022-07-11 12:04 ` Mimi Zohar
0 siblings, 1 reply; 4+ messages in thread
From: Jianglei Nie @ 2022-07-11 7:22 UTC (permalink / raw)
To: zohar, dmitry.kasatkin, jmorris, serge
Cc: linux-integrity, linux-security-module, linux-kernel, Jianglei Nie
This patch adds the missing kfree() for ima_algo_array allocated by
kcalloc() to avoid potential memory leak.
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
---
security/integrity/ima/ima_crypto.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index a7206cc1d7d1..64499056648a 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -205,6 +205,7 @@ int __init ima_init_crypto(void)
crypto_free_shash(ima_algo_array[i].tfm);
}
+ kfree(ima_algo_array);
out:
crypto_free_shash(ima_shash_tfm);
return rc;
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-07-11 12:04 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2022-07-04 0:59 [PATCH] ima/evm: Fix potential memory leak in ima_init_crypto() Jianglei Nie
2022-07-07 3:19 ` Mimi Zohar
2022-07-11 7:22 Jianglei Nie
2022-07-11 12:04 ` Mimi Zohar
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