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Subject: cec-compliance: don't check UID, instead test with a <Poll> Author: Hans Verkuil <hverk...@xs4all.nl> Date: Tue Mar 11 10:22:43 2025 +0100 The use of CEC_MSG_FL_RAW is only allowed if CAP_SYS_RAWIO is set. So don't check if you are root, instead just try to transmit a <Poll> message with CEC_MSG_FL_RAW set. If CEC_TRANSMIT returns EPERM, then that means CAP_SYS_RAWIO was not available, and in that case return NOTAPPLICABLE. Signed-off-by: Hans Verkuil <hverk...@xs4all.nl> utils/cec-compliance/cec-test-power.cpp | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=c363e9aa6d7047e4bdfb68a96fddde884c63487d diff --git a/utils/cec-compliance/cec-test-power.cpp b/utils/cec-compliance/cec-test-power.cpp index e685fe4824eb..253e81636a2b 100644 --- a/utils/cec-compliance/cec-test-power.cpp +++ b/utils/cec-compliance/cec-test-power.cpp @@ -527,8 +527,19 @@ static int standby_resume_wakeup_view_on(struct node *node, unsigned me, unsigne return NOTAPPLICABLE; if (me == CEC_LOG_ADDR_UNREGISTERED && from_unregistered) return NOTAPPLICABLE; - if (from_unregistered && getuid()) - return NOTAPPLICABLE; + + if (from_unregistered) { + cec_msg msg; + int res; + + // Check if we have permission to use CEC_MSG_FL_RAW. + // It relies on CAP_SYS_RAWIO being set. + cec_msg_init(&msg, me, la); + msg.flags |= CEC_MSG_FL_RAW; + res = doioctl(node, CEC_TRANSMIT, &msg); + if (res == EPERM) + return NOTAPPLICABLE; + } unsigned unresponsive_cnt = 0;
