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Diffstat (limited to 'Documentation/admin-guide/sysctl/kernel.rst')
| -rw-r--r-- | Documentation/admin-guide/sysctl/kernel.rst | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 239da22c4e28..ffea61d448eb 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -418,7 +418,8 @@ hung_task_detect_count ====================== Indicates the total number of tasks that have been detected as hung since -the system boot. +the system boot or since the counter was reset. The counter is zeroed when +a value of 0 is written. This file shows up if ``CONFIG_DETECT_HUNG_TASK`` is enabled. @@ -591,6 +592,9 @@ if leaking kernel pointer values to unprivileged users is a concern. When ``kptr_restrict`` is set to 2, kernel pointers printed using %pK will be replaced with 0s regardless of privileges. +For disabling these security restrictions early at boot time (and once +for all), use the ``hash_pointers`` boot parameter instead. + softlockup_sys_info & hardlockup_sys_info ========================================= A comma separated list of extra system information to be dumped when @@ -1235,12 +1239,6 @@ that support this feature. == =========================================================================== -real-root-dev -============= - -See Documentation/admin-guide/initrd.rst. - - reboot-cmd (SPARC only) ======================= @@ -1404,6 +1402,23 @@ Note that if you change this from 0 to 1, already created segments without users and with a dead originative process will be destroyed. +syscall_user_dispatch +===================== + +Controls whether userspace may arm Syscall User Dispatch via +``prctl(PR_SET_SYSCALL_USER_DISPATCH, ...)`` or the +``PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG`` ptrace request: + + == =================================================================== + 0 Arming syscall user dispatch is denied with ``-EPERM``. Tasks that + already armed it keep it, and disabling it is always permitted. + 1 (default) Arming syscall user dispatch is permitted. + == =================================================================== + +Only present when the kernel is built with ``CONFIG_SYSCALL_USER_DISPATCH`` +and ``CONFIG_SYSCTL``. + + sysctl_writes_strict ==================== |