Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN is comically trivially to trigger from userspace, e.g. by doing: struct kvm_enc_region range = { .addr = 0, .size = -1ul, }; __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range); Note, the checks in sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than ULONG_MAX. That wart will be cleaned up in the near future. if (range->addr > ULONG_MAX || range->size > ULONG_MAX) return -EINVAL; Opportunistically add a comment to explain why the code calculates the number of pages the "hard" way, e.g. instead of just shifting @ulen.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < 6a8e3c82122737529b25ef2a048fbcc569d8c055affected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < a703933bcfa5cc76ca10e2048464600e74136099affected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < abcd43ff579abd0a654bb4636086e78819dd5f4caffected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < b670833749ffd8681361db2bb047c6f2e3075f3aaffected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < ab423e5892826202a660b5ac85d1125b0e8301a5affected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < 28cc13ca20431b127d42d84ba10898d03e2c8267affected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < c29ff288a2d97a6f4640a498a367cf0eb91312ebaffected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < 1cba4dcd795daf6d257122779fb6a349edf03914affected78824fabc72e5e37d51e6e567fde70a4fc41a6d7 to < 8acffeef5ef720c35e513e322ab08e32683f32f2affected
Linux Linux
Default version status: affected
5.9affected0 to < 5.9unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.136 to ≤ 6.6.*unaffected6.12.83 to ≤ 6.12.*unaffected6.18.24 to ≤ 6.18.*unaffected6.19.14 to ≤ 6.19.*unaffected7.0.1 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055 ↗
- https://git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099 ↗
- https://git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c ↗
- https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a ↗
- https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5 ↗
- https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267 ↗
- https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb ↗
- https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914 ↗
- https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2 ↗