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passt: Explicitly check return value of chdir()

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...it doesn't actually matter as we're checking errno at the very
end, but, depending on build flags, chdir() might be declared with
warn_unused_result and the compiler issues a warning.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2022-02-25 22:42:36 +01:00
parent e221ca7613
commit 9b61bd0b39
1 changed files with 3 additions and 1 deletions
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passt.c
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@ -260,7 +260,9 @@ static int sandbox(struct ctx *c)
mount("", "/", "", MS_UNBINDABLE | MS_REC, NULL); mount("", "/", "", MS_UNBINDABLE | MS_REC, NULL);
mount("", TMPDIR, "tmpfs", MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_RDONLY, mount("", TMPDIR, "tmpfs", MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_RDONLY,
"nr_inodes=2,nr_blocks=0"); "nr_inodes=2,nr_blocks=0");
chdir(TMPDIR); if (chdir(TMPDIR))
return -errno;
syscall(SYS_pivot_root, ".", "."); syscall(SYS_pivot_root, ".", ".");
umount2(".", MNT_DETACH | UMOUNT_NOFOLLOW); umount2(".", MNT_DETACH | UMOUNT_NOFOLLOW);