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X-Rspamd-Queue-Id: 0656421A28 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240619_103331_917377_206B3ABE X-CRM114-Status: GOOD ( 31.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Petr Vorel Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > Hi, > Thanks for your review. > > -----Original Message----- > > From: Cyril Hrubis > > Sent: Tuesday, June 18, 2024 7:16 PM > > To: iwamatsu nobuhiro(岩松 信洋 ○ＤＩＴＣ□ＤＩＴ○ＯＳＴ) > > > > Cc: ltp@lists.linux.it > > Subject: Re: [PATCH] lib: tst_fd: Add kernel version check to memfd_secret > > Hi! > > > memfd_secret is a syscall added since 5.14. On earlier kernels, tests > > > such as accept03, readahead01 and splice07 that use memfd_secret fail. > > > This adds a kernel version check to the tst_fd library when running > > > tests using memfd_secret. > > > Test log on linux-5.10.162/arm32 with version 20240524: > > > ``` > > > $ ./testcases/kernel/syscalls/accept/accept03 > > > tst_test.c:1733: TINFO: LTP version: 20240524 > > > tst_test.c:1617: TINFO: Timeout per run is 0h 00m 30s > > > accept03.c:58: TPASS: accept() on file : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on O_PATH file : EBADF (9) > > > accept03.c:58: TPASS: accept() on directory : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on /dev/zero : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on /proc/self/maps : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on pipe read end : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on pipe write end : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on epoll : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on eventfd : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on signalfd : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on timerfd : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on pidfd : ENOTSOCK (88) > > > tst_fd.c:151: TCONF: Skipping fanotify: ENOSYS (38) > > > accept03.c:58: TPASS: accept() on inotify : ENOTSOCK (88) > > > tst_fd.c:170: TCONF: Skipping userfaultfd: ENOSYS (38) > > > accept03.c:58: TPASS: accept() on perf event : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on io uring : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on bpf map : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on fsopen : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on fspick : ENOTSOCK (88) > > > accept03.c:58: TPASS: accept() on open_tree : EBADF (9) > > > accept03.c:58: TPASS: accept() on memfd : ENOTSOCK (88) > > > tst_test.c:1677: TBROK: Test killed by SIGILL! > > This looks like a bug either in kernel or libc. > This is caused by __NR_memfd_secure being defined as -1 (0xffffffff)and "Illegal instruction" > occurs when syscall() is executed. And this problem does not occur on x86_64. > I cannot decide if this is a bug or not. I can't decide if this is a bug or not, because this behavior has > existed for a long time. Interesting. But it'd be good to discuss it, right? In case there is something to improve. Cc linux-arm-kernel ML. > > > Summary: > > > passed 20 > > > failed 0 > > > broken 1 > > > skipped 2 > > > warnings 0 > > > ``` > > > Closed: #1145 > > > Signed-off-by: Nobuhiro Iwamatsu > > > --- > > > lib/tst_fd.c | 8 ++++++++ > > > 1 file changed, 8 insertions(+) > > > diff --git a/lib/tst_fd.c b/lib/tst_fd.c index 6538a098c..53f583fa0 > > > 100644 > > > --- a/lib/tst_fd.c > > > +++ b/lib/tst_fd.c > > > @@ -255,8 +255,16 @@ static void open_memfd(struct tst_fd *fd) > > > static void open_memfd_secret(struct tst_fd *fd) { > > > + if ((tst_kvercmp(5, 14, 0)) < 0) { > > > + tst_res(TINFO, "accept() on %s: Linux kernel version is before > > than v5.14", tst_fd_desc(fd)); > > > + errno = ENOSYS; > > > + goto skip; > > > + } > > > + > > > fd->fd = syscall(__NR_memfd_secret, 0); > > > + > > > if (fd->fd < 0) { > > > +skip: > > > tst_res(TCONF | TERRNO, > > > "Skipping %s", tst_fd_desc(fd)); > > > } > > And this looks like you are working around the bug. > Your point is correct... > I would suggest using tst_syscall() to check for syscall undefined instead Well, I guess we don't want to use tst_syscall() otherwise it would call tst_brk(). I proposed similar patch some time ago [1], I suppose you told me privately exactly this. [1] https://patchwork.ozlabs.org/project/ltp/patch/20240124142108.303782-1-pvorel@suse.cz/ > of this modification. How about this modification? > ``` > --- a/lib/tst_fd.c > +++ b/lib/tst_fd.c > @@ -255,7 +255,8 @@ static void open_memfd(struct tst_fd *fd) > static void open_memfd_secret(struct tst_fd *fd) > { > - fd->fd = syscall(__NR_memfd_secret, 0); > + fd->fd = tst_syscall(__NR_memfd_secret, 0); > if (fd->fd < 0) { > tst_res(TCONF | TERRNO, > "Skipping %s", tst_fd_desc(fd)); Therefore how about this? if ((tst_kvercmp(5, 14, 0)) < 0) { tst_res(TCONF, "accept() on %s: skipping due old kernel", tst_fd_desc(fd)); return; } Kind regards, Petr > Best regards, > Nobuhiro