cve-2024-42318
Vulnerability from cvelistv5
Published
2024-08-17 09:09
Modified
2024-12-19 09:16
Severity ?
Summary
landlock: Don't lose track of restrictions on cred_transfer
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://bugs.chromium.org/p/project-zero/issues/detail?id=2566
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d74fd54db0bd0c0c224bef0da8fc95ea9c9f36c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16896914bace82d7811c62f3b6d5320132384f49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39705a6c29f8a2b93cf5b99528a55366c50014d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/916c648323fa53b89eedb34a0988ddaf01406117
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b14cc2cf313bd29056fadbc8ecd7f957cf5791ff
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lore.kernel.org/all/20240817.shahka3Ee1iy@digikod.net/
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://www.openwall.com/lists/oss-security/2024/08/17/2
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Don\u0027t lose track of restrictions on cred_transfer\n\nWhen a process\u0027 cred struct is replaced, this _almost_ always invokes\nthe cred_prepare LSM hook; but in one special case (when\nKEYCTL_SESSION_TO_PARENT updates the parent\u0027s credentials), the\ncred_transfer LSM hook is used instead.  Landlock only implements the\ncred_prepare hook, not cred_transfer, so KEYCTL_SESSION_TO_PARENT causes\nall information on Landlock restrictions to be lost.\n\nThis basically means that a process with the ability to use the fork()\nand keyctl() syscalls can get rid of all Landlock restrictions on\nitself.\n\nFix it by adding a cred_transfer hook that does the same thing as the\nexisting cred_prepare hook. (Implemented by having hook_cred_prepare()\ncall hook_cred_transfer() so that the two functions are less likely to\naccidentally diverge in the future.)"
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    "dateReserved": "2024-07-30T07:40:12.278Z",
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