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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 /fs
parent8f6936f4d29aa14e54a2470b954a2e1f96322988 (diff)
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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 'fs')
-rw-r--r--fs/nfsd/auth.c10
-rw-r--r--fs/proc/array.c21
2 files changed, 20 insertions, 11 deletions
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 21928056e35..d13403e3362 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -11,8 +11,6 @@
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/export.h>
-#define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
-
int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
{
struct exp_flavor_info *f;
@@ -69,10 +67,12 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
ret = set_current_groups(cred.cr_group_info);
put_group_info(cred.cr_group_info);
if ((cred.cr_uid)) {
- cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
+ current->cap_effective =
+ cap_drop_nfsd_set(current->cap_effective);
} else {
- cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
- current->cap_permitted);
+ current->cap_effective =
+ cap_raise_nfsd_set(current->cap_effective,
+ current->cap_permitted);
}
return ret;
}
diff --git a/fs/proc/array.c b/fs/proc/array.c
index b380313092b..6ba2746e451 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -281,14 +281,23 @@ static inline char *task_sig(struct task_struct *p, char *buffer)
return buffer;
}
+static char *render_cap_t(const char *header, kernel_cap_t *a, char *buffer)
+{
+ unsigned __capi;
+
+ buffer += sprintf(buffer, "%s", header);
+ CAP_FOR_EACH_U32(__capi) {
+ buffer += sprintf(buffer, "%08x",
+ a->cap[(_LINUX_CAPABILITY_U32S-1) - __capi]);
+ }
+ return buffer + sprintf(buffer, "\n");
+}
+
static inline char *task_cap(struct task_struct *p, char *buffer)
{
- return buffer + sprintf(buffer, "CapInh:\t%016x\n"
- "CapPrm:\t%016x\n"
- "CapEff:\t%016x\n",
- cap_t(p->cap_inheritable),
- cap_t(p->cap_permitted),
- cap_t(p->cap_effective));
+ buffer = render_cap_t("CapInh:\t", &p->cap_inheritable, buffer);
+ buffer = render_cap_t("CapPrm:\t", &p->cap_permitted, buffer);
+ return render_cap_t("CapEff:\t", &p->cap_effective, buffer);
}
static inline char *task_context_switch_counts(struct task_struct *p,