The patch titled
Subject: capabilities: add a securebit to disable PR_CAP_AMBIENT_RAISE
has been removed from the -mm tree. Its filename was
capabilities-add-a-securebit-to-disable-pr_cap_ambient_raise.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andy Lutomirski <luto@xxxxxxxxxx>
Subject: capabilities: add a securebit to disable PR_CAP_AMBIENT_RAISE
Per Andrew Morgan's request, add a securebit to allow admins to disable
PR_CAP_AMBIENT_RAISE. This securebit will prevent processes from adding
capabilities to their ambient set.
For simplicity, this disables PR_CAP_AMBIENT_RAISE entirely rather than
just disabling setting previously cleared bits.
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: Andrew G. Morgan <morgan@xxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Aaron Jones <aaronmdjones@xxxxxxxxx>
Cc: Ted Ts'o <tytso@xxxxxxx>
Cc: Andrew G. Morgan <morgan@xxxxxxxxxx>
Cc: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx>
Cc: Austin S Hemmelgarn <ahferroin7@xxxxxxxxx>
Cc: Markku Savela <msa@xxxxxxxxxxx>
Cc: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Cc: James Morris <james.l.morris@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/uapi/linux/securebits.h | 11 ++++++++++-
security/commoncap.c | 3 ++-
2 files changed, 12 insertions(+), 2 deletions(-)
diff -puN include/uapi/linux/securebits.h~capabilities-add-a-securebit-to-disable-pr_cap_ambient_raise include/uapi/linux/securebits.h
--- a/include/uapi/linux/securebits.h~capabilities-add-a-securebit-to-disable-pr_cap_ambient_raise
+++ a/include/uapi/linux/securebits.h
@@ -43,9 +43,18 @@
#define SECBIT_KEEP_CAPS (issecure_mask(SECURE_KEEP_CAPS))
#define SECBIT_KEEP_CAPS_LOCKED (issecure_mask(SECURE_KEEP_CAPS_LOCKED))
+/* When set, a process cannot add new capabilities to its ambient set. */
+#define SECURE_NO_CAP_AMBIENT_RAISE 6
+#define SECURE_NO_CAP_AMBIENT_RAISE_LOCKED 7 /* make bit-6 immutable */
+
+#define SECBIT_NO_CAP_AMBIENT_RAISE (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
+#define SECBIT_NO_CAP_AMBIENT_RAISE_LOCKED \
+ (issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE_LOCKED))
+
#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
issecure_mask(SECURE_NO_SETUID_FIXUP) | \
- issecure_mask(SECURE_KEEP_CAPS))
+ issecure_mask(SECURE_KEEP_CAPS) | \
+ issecure_mask(SECURE_NO_CAP_AMBIENT_RAISE))
#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1)
#endif /* _UAPI_LINUX_SECUREBITS_H */
diff -puN security/commoncap.c~capabilities-add-a-securebit-to-disable-pr_cap_ambient_raise security/commoncap.c
--- a/security/commoncap.c~capabilities-add-a-securebit-to-disable-pr_cap_ambient_raise
+++ a/security/commoncap.c
@@ -993,7 +993,8 @@ int cap_task_prctl(int option, unsigned
if (arg2 == PR_CAP_AMBIENT_RAISE &&
(!cap_raised(current_cred()->cap_permitted, arg3) ||
!cap_raised(current_cred()->cap_inheritable,
- arg3)))
+ arg3) ||
+ issecure(SECURE_NO_CAP_AMBIENT_RAISE)))
return -EPERM;
new = prepare_creds();
_
Patches currently in -mm which might be from luto@xxxxxxxxxx are
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