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| author |   Oleg Nesterov <oleg@redhat.com> | 2019-01-03 15:28:07 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-04 13:13:47 -0800 |
| commit | 8099b047ecc431518b9bb6bdbba3549bbecdc343 (patch) | |
| tree | f0abafbb5f20984f92165e4da26fb37377dd497a /include/linux/binfmts.h | |
| parent | fork: fix some -Wmissing-prototypes warnings (diff) | |
| download | wireguard-linux-8099b047ecc431518b9bb6bdbba3549bbecdc343.tar.xz wireguard-linux-8099b047ecc431518b9bb6bdbba3549bbecdc343.zip | |
exec: load_script: don't blindly truncate shebang string
load_script() simply truncates bprm->buf and this is very wrong if the
length of shebang string exceeds BINPRM_BUF_SIZE-2. This can silently
truncate i_arg or (worse) we can execute the wrong binary if buf[2:126]
happens to be the valid executable path.
Change load_script() to return ENOEXEC if it can't find '\n' or zero in
bprm->buf. Note that '\0' can come from either
prepare_binprm()->memset() or from kernel_read(), we do not care.
Link: http://lkml.kernel.org/r/20181112160931.GA28463@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Ben Woodard <woodard@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/binfmts.h')
0 files changed, 0 insertions, 0 deletions