On 03/27/2018 05:07 AM, Herbert Xu wrote:
On Fri, Mar 23, 2018 at 02:09:46PM -0500, Gustavo A. R. Silva wrote:
There is an ongoing effort to remove all VLAs from the code base  and
while working on that I came across the following macro at
#define SHASH_DESC_ON_STACK(shash, ctx) \
char __##shash##_desc[sizeof(struct shash_desc) + \
crypto_shash_descsize(ctx)] CRYPTO_MINALIGN_ATTR; \
struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
Currently, this macro is being used in 46 different places.
I wonder how big can tfm->descsize can get?
descsize is capped at PAGE_SIZE / 8.
Sorry for the late response. It seems I lost track of this email somehow.
OK. So based on your response I will propose a patch for this.