diff options
author | Eric Paris <eparis@redhat.com> | 2009-07-31 12:53:58 -0400 |
---|---|---|
committer | James Morris <jmorris@namei.org> | 2009-08-06 09:02:17 +1000 |
commit | 7c73875e7dda627040b12c19b01db634fa7f0fd1 (patch) | |
tree | f8f4df20bdcafb1bd981c8a7b0797d13b2625b27 /security/commoncap.c | |
parent | 012a5299a29672039f42944a37984558393ef769 (diff) | |
download | linux-7c73875e7dda627040b12c19b01db634fa7f0fd1.tar.bz2 |
Capabilities: move cap_file_mmap to commoncap.c
Currently we duplicate the mmap_min_addr test in cap_file_mmap and in
security_file_mmap if !CONFIG_SECURITY. This patch moves cap_file_mmap
into commoncap.c and then calls that function directly from
security_file_mmap ifndef CONFIG_SECURITY like all of the other capability
checks are done.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/commoncap.c')
-rw-r--r-- | security/commoncap.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index aa97704564d4..3852e9432801 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -984,3 +984,33 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages) cap_sys_admin = 1; return __vm_enough_memory(mm, pages, cap_sys_admin); } + +/* + * cap_file_mmap - check if able to map given addr + * @file: unused + * @reqprot: unused + * @prot: unused + * @flags: unused + * @addr: address attempting to be mapped + * @addr_only: unused + * + * If the process is attempting to map memory below mmap_min_addr they need + * CAP_SYS_RAWIO. The other parameters to this function are unused by the + * capability security module. Returns 0 if this mapping should be allowed + * -EPERM if not. + */ +int cap_file_mmap(struct file *file, unsigned long reqprot, + unsigned long prot, unsigned long flags, + unsigned long addr, unsigned long addr_only) +{ + int ret = 0; + + if (addr < mmap_min_addr) { + ret = cap_capable(current, current_cred(), CAP_SYS_RAWIO, + SECURITY_CAP_AUDIT); + /* set PF_SUPERPRIV if it turns out we allow the low mmap */ + if (ret == 0) + current->flags |= PF_SUPERPRIV; + } + return ret; +} |