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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2020-05-29 08:24:10 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2020-05-29 21:06:48 -0500 |
| commit | a7868323c2638a7c6c5b30b37831b73cbdf0dc15 (patch) | |
| tree | 645cd8ae2bb31c07ebb2831b692aa6615cf6fc25 /include/linux/binfmts.h | |
| parent | Merge commit a4ae32c71fe9 ("exec: Always set cap_ambient in cap_bprm_set_creds") (diff) | |
| download | wireguard-linux-a7868323c2638a7c6c5b30b37831b73cbdf0dc15.tar.xz wireguard-linux-a7868323c2638a7c6c5b30b37831b73cbdf0dc15.zip | |
exec: Add a per bprm->file version of per_clear
There is a small bug in the code that recomputes parts of bprm->cred
for every bprm->file. The code never recomputes the part of
clear_dangerous_personality_flags it is responsible for.
Which means that in practice if someone creates a sgid script
the interpreter will not be able to use any of:
READ_IMPLIES_EXEC
ADDR_NO_RANDOMIZE
ADDR_COMPAT_LAYOUT
MMAP_PAGE_ZERO.
This accentially clearing of personality flags probably does
not matter in practice because no one has complained
but it does make the code more difficult to understand.
Further remaining bug compatible prevents the recomputation from being
removed and replaced by simply computing bprm->cred once from the
final bprm->file.
Making this change removes the last behavior difference between
computing bprm->creds from the final file and recomputing
bprm->cred several times. Which allows this behavior change
to be justified for it's own reasons, and for any but hunts
looking into why the behavior changed to wind up here instead
of in the code that will follow that computes bprm->cred
from the final bprm->file.
This small logic bug appears to have existed since the code
started clearing dangerous personality bits.
History Tree: git://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Fixes: 1bb0fa189c6a ("[PATCH] NX: clean up legacy binary support")
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/binfmts.h')
| -rw-r--r-- | include/linux/binfmts.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index 7fc05929c967..50025ead0b72 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -55,6 +55,11 @@ struct linux_binprm { struct file * file; struct cred *cred; /* new credentials */ int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ + /* + * bits to clear in current->personality + * recalculated for each bprm->file. + */ + unsigned int pf_per_clear; unsigned int per_clear; /* bits to clear in current->personality */ int argc, envc; const char * filename; /* Name of binary as seen by procps */ |