e338d263a7
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>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* linux/fs/nfsd/auth.c
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/svcauth.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/export.h>
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int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
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{
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struct exp_flavor_info *f;
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struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
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for (f = exp->ex_flavors; f < end; f++) {
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if (f->pseudoflavor == rqstp->rq_flavor)
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return f->flags;
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}
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return exp->ex_flags;
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}
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int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
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{
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struct svc_cred cred = rqstp->rq_cred;
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int i;
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int flags = nfsexp_flags(rqstp, exp);
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int ret;
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if (flags & NFSEXP_ALLSQUASH) {
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cred.cr_uid = exp->ex_anon_uid;
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cred.cr_gid = exp->ex_anon_gid;
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cred.cr_group_info = groups_alloc(0);
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} else if (flags & NFSEXP_ROOTSQUASH) {
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struct group_info *gi;
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if (!cred.cr_uid)
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cred.cr_uid = exp->ex_anon_uid;
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if (!cred.cr_gid)
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cred.cr_gid = exp->ex_anon_gid;
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gi = groups_alloc(cred.cr_group_info->ngroups);
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if (gi)
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for (i = 0; i < cred.cr_group_info->ngroups; i++) {
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if (!GROUP_AT(cred.cr_group_info, i))
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GROUP_AT(gi, i) = exp->ex_anon_gid;
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else
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GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
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}
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cred.cr_group_info = gi;
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} else
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get_group_info(cred.cr_group_info);
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if (cred.cr_uid != (uid_t) -1)
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current->fsuid = cred.cr_uid;
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else
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current->fsuid = exp->ex_anon_uid;
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if (cred.cr_gid != (gid_t) -1)
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current->fsgid = cred.cr_gid;
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else
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current->fsgid = exp->ex_anon_gid;
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if (!cred.cr_group_info)
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return -ENOMEM;
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ret = set_current_groups(cred.cr_group_info);
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put_group_info(cred.cr_group_info);
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if ((cred.cr_uid)) {
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current->cap_effective =
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cap_drop_nfsd_set(current->cap_effective);
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} else {
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current->cap_effective =
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cap_raise_nfsd_set(current->cap_effective,
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current->cap_permitted);
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}
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return ret;
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}
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