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authorTyler Hicks <tyhicks@canonical.com>2017-08-11 07:33:53 +0300
committerKees Cook <keescook@chromium.org>2017-08-14 23:46:44 +0300
commitd612b1fd8010d0d67b5287fe146b8b55bcbb8655 (patch)
treecadcaeebf71ffa28aced54e9fc8b7c0ee42cc6d3 /Documentation/userspace-api
parent8e5f1ad116df6b0de65eac458d5e7c318d1c05af (diff)
downloadlinux-d612b1fd8010d0d67b5287fe146b8b55bcbb8655.tar.xz
seccomp: Operation for checking if an action is available
Userspace code that needs to check if the kernel supports a given action may not be able to use the /proc/sys/kernel/seccomp/actions_avail sysctl. The process may be running in a sandbox and, therefore, sufficient filesystem access may not be available. This patch adds an operation to the seccomp(2) syscall that allows userspace code to ask the kernel if a given action is available. If the action is supported by the kernel, 0 is returned. If the action is not supported by the kernel, -1 is returned with errno set to -EOPNOTSUPP. If this check is attempted on a kernel that doesn't support this new operation, -1 is returned with errno set to -EINVAL meaning that userspace code will have the ability to differentiate between the two error cases. Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Suggested-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Kees Cook <keescook@chromium.org>
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