CVE-2025-37984
crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()
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crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()
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 ecdsa implementation'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 and use 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 a user-specified ASN.1 length in the case of ecdsa_get_signature_rs().
Reserved 2025-04-16 | Published 2025-05-20 | Updated 2025-05-26 | Assigner Linuxgit.kernel.org/...c/921b8167f10708e38080f84e195cdc68a7a561f1
git.kernel.org/...c/b16510a530d1e6ab9683f04f8fb34f2e0f538275
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