On 12/28, Oleg Nesterov wrote:

On 12/28, Andrey Vagin wrote:

quoted

@@ -338,6 +379,7 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
 		}

 		file->f_flags |= flags & SFD_RAW;
+		file->f_mode |= FMODE_PREAD;

Again, this is not needed or the code was broken by the previous patch.

Given that 2/3 passes O_RDWR to anon_inode_getfile() I think FMODE_PREAD
should be already set. Note OPEN_FMODE(flags) in anon_inode_getfile().

As you explained in another thread I was wrong, I confused FMODE_PREAD
and FMODE_READ.

Oleg.