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docs: add io_uring_* syscalls to seccomp significant syscalls table

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The io_uring_enter, io_uring_register, and io_uring_setup syscalls were
removed from Docker's default seccomp allowlist in moby/moby#46762 due
to security vulnerabilities that can be exploited to escape containers.
Add them to the significant blocked syscalls table.

Fixes #23784
This commit is contained in:
dvdksn
2026-03-20 15:52:03 +01:00
parent 369f69bd8c
commit 142b14c4f5
1 changed files with 3 additions and 0 deletions
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content/manuals/engine/security/seccomp.md
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@@ -71,6 +71,9 @@ the reason each syscall is blocked rather than white-listed.
| `init_module` | Deny manipulation and functions on kernel modules. Also gated by `CAP_SYS_MODULE`. |
| `ioperm` | Prevent containers from modifying kernel I/O privilege levels. Already gated by `CAP_SYS_RAWIO`. |
| `iopl` | Prevent containers from modifying kernel I/O privilege levels. Already gated by `CAP_SYS_RAWIO`. |
| `io_uring_enter` | Blocked due to security vulnerabilities that can be exploited to break out of containers. See [moby/moby#46762](https://github.com/moby/moby/pull/46762). |
| `io_uring_register` | Blocked due to security vulnerabilities that can be exploited to break out of containers. See [moby/moby#46762](https://github.com/moby/moby/pull/46762). |
| `io_uring_setup` | Blocked due to security vulnerabilities that can be exploited to break out of containers. See [moby/moby#46762](https://github.com/moby/moby/pull/46762). |
| `kcmp` | Restrict process inspection capabilities, already blocked by dropping `CAP_SYS_PTRACE`. |
| `kexec_file_load` | Sister syscall of `kexec_load` that does the same thing, slightly different arguments. Also gated by `CAP_SYS_BOOT`. |
| `kexec_load` | Deny loading a new kernel for later execution. Also gated by `CAP_SYS_BOOT`. |