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https://github.com/containers/fuse-overlayfs.git
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86b9cf5a83
restore the inode mode if there is a writepage request that could reset the setuid bit. Closes: https://github.com/containers/fuse-overlayfs/issues/127 Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
31 lines
497 B
C
31 lines
497 B
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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int
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main ()
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{
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int fd;
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unlink ("suid");
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unlink ("nosuid");
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fd = open ("suid", O_WRONLY|O_CREAT|O_EXCL);
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write (fd, "1", 1);
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fchown (fd, 0, 0);
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fchmod (fd, S_ISUID | 0755);
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close (fd);
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fd = open ("nosuid", O_WRONLY|O_CREAT|O_EXCL);
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write (fd, "1", 1);
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fchown (fd, 0, 0);
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fchmod (fd, S_ISUID | 0755);
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write (fd, "2", 1);
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close (fd);
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return 0;
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}
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