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apparmor: use SHASH_DESC_ON_STACK

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When building the kernel with clang, the compiler fails to build
security/apparmor/crypto.c with the following error:

    security/apparmor/crypto.c:36:8: error: fields must have a constant
    size: 'variable length array in structure' extension will never be
    supported
                    char ctx[crypto_shash_descsize(apparmor_tfm)];
                         ^

Since commit a0a77af141 ("crypto: LLVMLinux: Add macro to remove use
of VLAIS in crypto code"), include/crypto/hash.h defines
SHASH_DESC_ON_STACK to work around this issue. Use it in aa_calc_hash()
and aa_calc_profile_hash().

Change-Id: I7668f8c6440660e7b68afd8aefd066e496f3beb4
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Git-commit: 9814448da7a84dd50b69e4ada2d7d1c042493daf
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
This commit is contained in:
Nicolas Iooss 2017-04-06 06:55:21 -07:00 • committed by Gerrit - the friendly Code Review server
commit 31b59d111b
1 changed files with 7 additions and 10 deletions
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17
security/apparmor/crypto.c
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@ -32,10 +32,7 @@ unsigned int aa_hash_size(void)
int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
size_t len)
{
struct {
struct shash_desc shash;
char ctx[crypto_shash_descsize(apparmor_tfm)];
} desc;
SHASH_DESC_ON_STACK(desc, apparmor_tfm);
int error = -ENOMEM;
u32 le32_version = cpu_to_le32(version);
@ -49,19 +46,19 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
if (!profile->hash)
goto fail;
desc.shash.tfm = apparmor_tfm;
desc.shash.flags = 0;
desc->tfm = apparmor_tfm;
desc->flags = 0;
error = crypto_shash_init(&desc.shash);
error = crypto_shash_init(desc);
if (error)
goto fail;
error = crypto_shash_update(&desc.shash, (u8 *) &le32_version, 4);
error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
if (error)
goto fail;
error = crypto_shash_update(&desc.shash, (u8 *) start, len);
error = crypto_shash_update(desc, (u8 *) start, len);
if (error)
goto fail;
error = crypto_shash_final(&desc.shash, profile->hash);
error = crypto_shash_final(desc, profile->hash);
if (error)
goto fail;