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From: "dluyaning at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29622] New: Open file permission error under aarch64
 architecture
Date: Wed, 28 Sep 2022 02:01:09 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.28
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dluyaning at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29622

            Bug ID: 29622
           Summary: Open file permission error under aarch64 architecture
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: dluyaning at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

strace log=EF=BC=9A

openat(AT_FDCWD, "/home/lyn/test/", O_RDWR|O_CLOEXEC|O_TMPFILE, 0134240) =
=3D 12
write(12, "11111\0", 6) =3D 6
lseek(12, 0, SEEK_SET) =3D 0

demo=EF=BC=9A
#define _GNU_SOURCE

#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/limits.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
char path[PATH_MAX];
int fd =3D open("/home/lyn/test", O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR);
write(fd, "hello", 5);
fsync(fd);
printf("pidis %d\n", getpid());
snprintf(path, PATH_MAX, "/proc/self/fd/%d", fd);
int ret =3D linkat(fd, path, AT_FDCWD, "yyyy", AT_SYMLINK_FOLLOW);
if(ret < 0)

{ printf("linkat error %d %s\n", errno, strerror(errno)); }
pause();

return 0;
}

--=20
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