Description
In the Linux kernel, the following vulnerability has been resolved: proc: protect ptrace_may_access() with exec_update_lock (FD links) proc_pid_get_link() and proc_pid_readlink() currently look up the task from the pid once, then do the ptrace access check on that task, then look up the task from the pid a second time to do the actual access. That's racy in several ways. To fix it, pass the task to the ->proc_get_link() handler, and instead of proc_fd_access_allowed(), introduce a new helper call_proc_get_link() that looks up and locks the task, does the access check, and calls ->proc_get_link().
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
778c1144771f0064b6f51bee865cceb0d996f2f9 to < 6253dfee5afba536bb54fc6fe6c091c3758fafe1affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < 65bf0d2b6e914f1448d6a2fde193dcf60936a651affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < de497d7aa2fae453a7e7c8f7d3e8682e565e3aafaffected778c1144771f0064b6f51bee865cceb0d996f2f9 to < 138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < 83b17872e3166c295c599279fc9562ac3840c638affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < 497c6bae5167428596575f20af6613ff5671f383affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < dfd1894cb64cbd8758b461ed713800fe73db4f82affected778c1144771f0064b6f51bee865cceb0d996f2f9 to < 6255da28d4bb5349fe18e84cb043ccd394eba75daffected
Linux Linux
Default version status: affected
2.6.18affected0 to < 2.6.18unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6253dfee5afba536bb54fc6fe6c091c3758fafe1 ↗
- https://git.kernel.org/stable/c/65bf0d2b6e914f1448d6a2fde193dcf60936a651 ↗
- https://git.kernel.org/stable/c/de497d7aa2fae453a7e7c8f7d3e8682e565e3aaf ↗
- https://git.kernel.org/stable/c/138c692d2b2d63d26f2eb957d0e4fcc5d61f9ff2 ↗
- https://git.kernel.org/stable/c/83b17872e3166c295c599279fc9562ac3840c638 ↗
- https://git.kernel.org/stable/c/497c6bae5167428596575f20af6613ff5671f383 ↗
- https://git.kernel.org/stable/c/dfd1894cb64cbd8758b461ed713800fe73db4f82 ↗
- https://git.kernel.org/stable/c/6255da28d4bb5349fe18e84cb043ccd394eba75d ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗