Since kernel commit[1], finit_module fails with ETXTBSY error if fd has write permission. Since kernel commit[2], finit_module fails with EBADF error if fd doesn't have read permission. So we can use read-write permission to trigger ETXTBSY error all the time since linux 4.7. [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39d637af [2]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=032146cd Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx> --- man2/init_module.2 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/man2/init_module.2 b/man2/init_module.2 index aac0c6631..2bcbaf4c3 100644 --- a/man2/init_module.2 +++ b/man2/init_module.2 @@ -242,6 +242,13 @@ is invalid. .B ENOEXEC .I fd does not refer to an open file. +.TP +.BR ETXTBSY " (since Linux 4.7)" +.\" commit 39d637af5aa7577f655c58b9e55587566c63a0af +The file referred to by +.I fd +is opened for read-write. +. .PP In addition to the above errors, if the module's .I init -- 2.23.0
