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authorGreg Kurz <groug@kaod.org>2017-02-26 23:43:17 +0100
committerGreg Kurz <groug@kaod.org>2017-02-28 11:21:15 +0100
commita33eda0dd99e00faa3bacae43d19490bb9500e07 (patch)
tree82dddab6b93ce1d9fa0743055c16aa8a211392f4 /backends
parenta0e640a87210b1e986bcd4e7f7de03beb3db0a4a (diff)
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9pfs: local: utimensat: don't follow symlinks
The local_utimensat() callback is vulnerable to symlink attacks because it calls qemu_utimens()->utimensat(AT_SYMLINK_NOFOLLOW) which follows symbolic links in all path elements but the rightmost one or qemu_utimens()->utimes() which follows symbolic links for all path elements. This patch converts local_utimensat() to rely on opendir_nofollow() and utimensat(AT_SYMLINK_NOFOLLOW) directly instead of using qemu_utimens(). It is hence assumed that the OS supports utimensat(), i.e. has glibc 2.6 or higher and linux 2.6.22 or higher, which seems reasonable nowadays. This partly fixes CVE-2016-9602. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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