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authorAndrew Morgan <morgan@kernel.org>2008-02-04 22:29:42 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:20 -0800
commite338d263a76af78fe8f38a72131188b58fceb591 (patch)
treef3f046fc6fd66de43de7191830f0daf3bc4ec8eb /security/dummy.c
parent8f6936f4d29aa14e54a2470b954a2e1f96322988 (diff)
Add 64-bit capability support to the kernel
The patch supports legacy (32-bit) capability userspace, and where possible translates 32-bit capabilities to/from userspace and the VFS to 64-bit kernel space capabilities. If a capability set cannot be compressed into 32-bits for consumption by user space, the system call fails, with -ERANGE. FWIW libcap-2.00 supports this change (and earlier capability formats) http://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/ [akpm@linux-foundation.org: coding-syle fixes] [akpm@linux-foundation.org: use get_task_comm()] [ezk@cs.sunysb.edu: build fix] [akpm@linux-foundation.org: do not initialise statics to 0 or NULL] [akpm@linux-foundation.org: unused var] [serue@us.ibm.com: export __cap_ symbols] Signed-off-by: Andrew G. Morgan <morgan@kernel.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: James Morris <jmorris@namei.org> Cc: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/dummy.c')
-rw-r--r--security/dummy.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/security/dummy.c b/security/dummy.c
index c505122e22d..649326bf64e 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -36,14 +36,19 @@ static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
kernel_cap_t * inheritable, kernel_cap_t * permitted)
{
- *effective = *inheritable = *permitted = 0;
if (target->euid == 0) {
- *permitted |= (~0 & ~CAP_FS_MASK);
- *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
+ cap_set_full(*permitted);
+ cap_set_init_eff(*effective);
+ } else {
+ cap_clear(*permitted);
+ cap_clear(*effective);
}
- if (target->fsuid == 0) {
- *permitted |= CAP_FS_MASK;
- *effective |= CAP_FS_MASK;
+
+ cap_clear(*inheritable);
+
+ if (target->fsuid != 0) {
+ *permitted = cap_drop_fs_set(*permitted);
+ *effective = cap_drop_fs_set(*effective);
}
return 0;
}