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uml: fix build error due to frame size > 1024

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the UML build fails during the kernel build:
| arch/um/drivers/net_kern.c: In function 'compute_hash':
| arch/um/drivers/net_kern.c:322:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
|  322 | }
|      | ^
|cc1: all warnings being treated as errors

The compute_hash() function is added by our patch:
102-pseudo-random-mac.patch

Instead of allocating a 1024 byte buffer on the stack for the SHA1
digest input, let's allocate the data on the heap. We should be
able to do that since crypto_alloc_ahash and ahash_request_alloc
also need to allocate structures on the heap.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter 2023-05-21 18:30:14 +02:00
parent 7d0fb2cc34
commit aed2569d37
1 changed files with 14 additions and 10 deletions
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24
target/linux/uml/patches-5.15/102-pseudo-random-mac.patch
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@ -49,7 +49,7 @@ Applies to vanilla kernel 3.9.4.
#define DRIVER_NAME "uml-netdev"
static DEFINE_SPINLOCK(opened_lock);
@@ -274,9 +282,51 @@ static const struct ethtool_ops uml_net_
@@ -274,9 +282,55 @@ static const struct ethtool_ops uml_net_
.get_ts_info = ethtool_op_get_ts_info,
};
@ -59,24 +59,26 @@ Applies to vanilla kernel 3.9.4.
+ * * an interface name. */
+static int compute_hash(const char *umid, const char *ifname, char *hash)
+{
+ struct ahash_request *desc;
+ struct crypto_ahash *tfm;
+ struct ahash_request *desc = NULL;
+ struct crypto_ahash *tfm = NULL;
+ struct scatterlist sg;
+ char vmif[1024];
+ int ret;
+ char *vmif = NULL;
+ int ret = -ENOMEM;
+
+ vmif = kmalloc(1024, GFP_KERNEL);
+ if (!vmif)
+ goto out;
+
+ strcpy (vmif, umid);
+ strcat (vmif, ifname);
+
+ tfm = crypto_alloc_ahash("sha1", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm))
+ return -ENOMEM;
+ goto out;
+
+ desc = ahash_request_alloc(tfm, GFP_KERNEL);
+ if (!desc) {
+ ret = -ENOMEM;
+ if (!desc)
+ goto out;
+ }
+
+ crypto_ahash_clear_flags(tfm, ~0);
+
@ -88,6 +90,8 @@ Applies to vanilla kernel 3.9.4.
+ ret = crypto_ahash_digest(desc);
+out:
+ crypto_free_ahash(tfm);
+ ahash_request_free(desc);
+ kfree(vmif);
+
+ return ret;
+}
@ -101,7 +105,7 @@ Applies to vanilla kernel 3.9.4.
char *end;
int i;
@@ -319,9 +369,26 @@ void uml_net_setup_etheraddr(struct net_
@@ -319,9 +373,26 @@ void uml_net_setup_etheraddr(struct net_
return;
random: