vsock: Fix transport_{g2h,h2g} TOCTOU
Description
In the Linux kernel, the following vulnerability has been resolved:
vsock: Fix transport_{g2h,h2g} TOCTOU
vsock_find_cid() and vsock_dev_do_ioctl() may race with module unload. transport_{g2h,h2g} may become NULL after the NULL check.
Introduce vsock_transport_local_cid() to protect from a potential null-ptr-deref.
KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f] RIP: 0010:vsock_find_cid+0x47/0x90 Call Trace: __vsock_bind+0x4b2/0x720 vsock_bind+0x90/0xe0 __sys_bind+0x14d/0x1e0 __x64_sys_bind+0x6e/0xc0 do_syscall_64+0x92/0x1c0 entry_SYSCALL_64_after_hwframe+0x4b/0x53
KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f] RIP: 0010:vsock_dev_do_ioctl.isra.0+0x58/0xf0 Call Trace: __x64_sys_ioctl+0x12d/0x190 do_syscall_64+0x92/0x1c0 entry_SYSCALL_64_after_hwframe+0x4b/0x53
Affected products
2- Linux/Linuxv5Range: 5.5
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- git.kernel.org/stable/c/209fd720838aaf1420416494c5505096478156b4mitre
- git.kernel.org/stable/c/3734d78210cceb2ee5615719a62a5c55ed381ff8mitre
- git.kernel.org/stable/c/401239811fa728fcdd53e360a91f157ffd23e1f4mitre
- git.kernel.org/stable/c/5752d8dbb3dfd7f1a9faf0f65377e60826ea9a17mitre
- git.kernel.org/stable/c/6a1bcab67bea797d83aa9dd948a0ac6ed52d121dmitre
- git.kernel.org/stable/c/80d7dc15805a93d520a249ac6d13d4f4df161c1bmitre
- git.kernel.org/stable/c/c5496ee685c48ed1cc183cd4263602579bb4a615mitre
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