Description
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare Observed on kernel 6.6 (present on master as well): BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0 Call trace: kasan_check_range+0xe8/0x190 __asan_loadN+0x1c/0x28 memcmp+0x98/0xd0 efivarfs_d_compare+0x68/0xd8 __d_lookup_rcu_op_compare+0x178/0x218 __d_lookup_rcu+0x1f8/0x228 d_alloc_parallel+0x150/0x648 lookup_open.isra.0+0x5f0/0x8d0 open_last_lookups+0x264/0x828 path_openat+0x130/0x3f8 do_filp_open+0x114/0x248 do_sys_openat2+0x340/0x3c0 __arm64_sys_openat+0x120/0x1a0 If dentry->d_name.len < EFI_VARIABLE_GUID_LEN , 'guid' can become negative, leadings to oob. The issue can be triggered by parallel lookups using invalid filename: T1 T2 lookup_open ->lookup simple_lookup d_add // invalid dentry is added to hash list lookup_open d_alloc_parallel __d_lookup_rcu __d_lookup_rcu_op_compare hlist_bl_for_each_entry_rcu // invalid dentry can be retrieved ->d_compare efivarfs_d_compare // oob Fix it by checking 'guid' before cmp.
Product status
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before 794399019301944fd6d2e0d7a51b3327e26c410e
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before 568e7761279b99c6daa3002290fd6d8047ddb6d2
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before 925599eba46045930b850a98ae594d2e3028ac40
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before c2925cd6207079c3f4d040d082515db78d63afbf
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before 71581a82f38e5a4d807d71fc1bb59aead80ccf95
da27a24383b2b10bf6ebd0db29b325548aafecb4 (git) before a6358f8cf64850f3f27857b8ed8c1b08cfc4685c
688289c4b745c018b3449b4b4c5a2030083c8eaf (git)
3.9
Any version before 3.9
5.4.298 (semver)
5.10.242 (semver)
5.15.191 (semver)
6.1.150 (semver)
6.6.104 (semver)
6.12.45 (semver)
6.16.5 (semver)
6.17 (original_commit_for_fix)
References
git.kernel.org/...c/0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6
git.kernel.org/...c/794399019301944fd6d2e0d7a51b3327e26c410e
git.kernel.org/...c/568e7761279b99c6daa3002290fd6d8047ddb6d2
git.kernel.org/...c/d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7
git.kernel.org/...c/925599eba46045930b850a98ae594d2e3028ac40
git.kernel.org/...c/c2925cd6207079c3f4d040d082515db78d63afbf
git.kernel.org/...c/71581a82f38e5a4d807d71fc1bb59aead80ccf95
git.kernel.org/...c/a6358f8cf64850f3f27857b8ed8c1b08cfc4685c
