Backport:

10882 tar fix
10884, 10920, 11128 tail fixes
10885 tftp -g fix
10900 dpkg fix (script support)
And I guess 10918 isn't relevant?

1 files changed, 6 insertions, 0 deletions

diff --git a/busybox/coreutils/tail.c b/busybox/coreutils/tail.c
index e3f89d2..1db1e2b 100644
--- a/busybox/coreutils/tail.c
+++ b/busybox/coreutils/tail.c
@@ -79,7 +79,13 @@ static void tail_xbb_full_write(const char *buf, size_t len)
 static ssize_t tail_read(int fd, char *buf, size_t count)
 {
 	ssize_t r;
+	off_t current,end;
+	struct stat sbuf;
 
+	end = current = lseek(fd, 0, SEEK_CUR);
+	if (!fstat(fd, &sbuf))
+		end = sbuf.st_size;
+	lseek(fd, end < current ? 0 : current, SEEK_SET);
 	if ((r = safe_read(fd, buf, count)) < 0) {
 		bb_perror_msg("read");
 		status = EXIT_FAILURE;