Re: [RESEND] SHASH_DESC_ON_STACK macro
Hi Herbert, 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: Hi Herbert, There is an ongoing effort to remove all VLAs from the code base [1] and while working on that I came across the following macro at include/crypto/hash.h:154: #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. Thanks! -- Gustavo
Re: [RESEND] SHASH_DESC_ON_STACK macro
On Fri, Mar 23, 2018 at 02:09:46PM -0500, Gustavo A. R. Silva wrote: > > Hi Herbert, > > There is an ongoing effort to remove all VLAs from the code base [1] and > while working on that I came across the following macro at > include/crypto/hash.h:154: > > #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. Cheers, -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
