Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before 6a8e3c82122737529b25ef2a048fbcc569d8c055; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before a703933bcfa5cc76ca10e2048464600e74136099; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before abcd43ff579abd0a654bb4636086e78819dd5f4c; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before b670833749ffd8681361db2bb047c6f2e3075f3a; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before ab423e5892826202a660b5ac85d1125b0e8301a5; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before 28cc13ca20431b127d42d84ba10898d03e2c8267; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before c29ff288a2d97a6f4640a498a367cf0eb91312eb; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before 1cba4dcd795daf6d257122779fb6a349edf03914; affected 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 before 8acffeef5ef720c35e513e322ab08e32683f32f2 |
| Linux / Linux | affected 5.9; unaffected 0 before 5.9; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.136 through 6.6.*; unaffected 6.12.83 through 6.12.*; unaffected 6.18.24 through 6.18.*; unaffected 6.19.14 through 6.19.*; unaffected 7.0.1 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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