Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsaimplementation's ->key_size() callback returns an unusually large value.Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7)Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro anduse it in lieu of DIV_ROUND_UP() for ->key_size() return values.Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes"parameter is a ->key_size() return value in some instances, or auser-specified ASN.1 length in the case of ecdsa_get_signature_rs().
No PoCs from references.
- https://github.com/w4zu/Debian_security