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lib: rsa: fix allocated size for rr and rrtmp in rsa_gen_key_prop()

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When calculating rrtmp/rr rsa_gen_key_prop() tries to make
(((rlen + 31) >> 5) + 1) steps in the rr uint32_t array and
(((rlen + 7) >> 3) + 1) / 4 steps in uint32_t rrtmp[]
with rlen being num_bits * 2

On a 4096bit key this comes down to to 257 uint32_t elements
in rr and 256 elements in rrtmp but with the current allocation
rr and rrtmp only have 129 uint32_t elements.

On 2048bit keys this works by chance as the defined max_rsa_size=4096
allocates a suitable number of elements, but with an actual 4096bit key
this results in other memory parts getting overwritten.

So as suggested by Heinrich Schuchardt just use the actual bit-size
of the key as base for the size calculation, in turn making the code
compatible to any future keysizes.

Suggested-by: Heinrich Schuchardt <xypron.debian@gmx.de>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

rrtmp needs 2 + (((*prop)->num_bits * 2) >> 5) array elements.

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heiko Stuebner 2020-07-07 22:57:26 +02:00 committed by Tom Rini
parent 8434b43730
commit 49d0ea3746
1 changed files with 9 additions and 5 deletions
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14
lib/rsa/rsa-keyprop.c
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@ -654,14 +654,10 @@ int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
{
struct rsa_key rsa_key;
uint32_t *n = NULL, *rr = NULL, *rrtmp = NULL;
const int max_rsa_size = 4096;
int rlen, i, ret;
*prop = calloc(sizeof(**prop), 1);
n = calloc(sizeof(uint32_t), 1 + (max_rsa_size >> 5));
rr = calloc(sizeof(uint32_t), 1 + (max_rsa_size >> 5));
rrtmp = calloc(sizeof(uint32_t), 1 + (max_rsa_size >> 5));
if (!(*prop) || !n || !rr || !rrtmp) {
if (!(*prop)) {
ret = -ENOMEM;
goto err;
}
@ -682,6 +678,14 @@ int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
}
memcpy((void *)(*prop)->modulus, &rsa_key.n[i], rsa_key.n_sz - i);
n = calloc(sizeof(uint32_t), 1 + ((*prop)->num_bits >> 5));
rr = calloc(sizeof(uint32_t), 1 + (((*prop)->num_bits * 2) >> 5));
rrtmp = calloc(sizeof(uint32_t), 2 + (((*prop)->num_bits * 2) >> 5));
if (!n || !rr || !rrtmp) {
ret = -ENOMEM;
goto err;
}
/* exponent */
(*prop)->public_exponent = calloc(1, sizeof(uint64_t));
if (!(*prop)->public_exponent) {