Commit 1209726c authored by Andrew G. Morgan's avatar Andrew G. Morgan Committed by Linus Torvalds

security: filesystem capabilities: fix CAP_SETPCAP handling

The filesystem capability support meaning for CAP_SETPCAP is less powerful
than the non-filesystem capability support.  As such, when filesystem
capabilities are configured, we should not permit CAP_SETPCAP to 'enhance'
the current process through strace manipulation of a child process.
Signed-off-by: default avatarAndrew G. Morgan <morgan@kernel.org>
Acked-by: default avatarSerge Hallyn <serue@us.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 086f7316
......@@ -103,10 +103,16 @@ static inline int cap_inh_is_capped(void)
return (cap_capable(current, CAP_SETPCAP) != 0);
}
static inline int cap_limit_ptraced_target(void) { return 1; }
#else /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
static inline int cap_block_setpcap(struct task_struct *t) { return 0; }
static inline int cap_inh_is_capped(void) { return 1; }
static inline int cap_limit_ptraced_target(void)
{
return !capable(CAP_SETPCAP);
}
#endif /* def CONFIG_SECURITY_FILE_CAPABILITIES */
......@@ -342,9 +348,10 @@ void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
bprm->e_uid = current->uid;
bprm->e_gid = current->gid;
}
if (!capable (CAP_SETPCAP)) {
new_permitted = cap_intersect (new_permitted,
current->cap_permitted);
if (cap_limit_ptraced_target()) {
new_permitted =
cap_intersect(new_permitted,
current->cap_permitted);
}
}
}
......
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