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split cap_mmap_addr() out of cap_file_mmap() 

... switch callers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-05-30 13:11:37 -04:00
parent cf74d14c4f
commit d007794a18
5 changed files with 29 additions and 14 deletions
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3
include/linux/security.h
View File

@ -86,6 +86,7 @@ extern int cap_inode_setxattr(struct dentry *dentry, const char *name,
extern int cap_inode_removexattr(struct dentry *dentry, const char *name);
extern int cap_inode_need_killpriv(struct dentry *dentry);
extern int cap_inode_killpriv(struct dentry *dentry);
extern int cap_mmap_addr(unsigned long addr);
extern int cap_file_mmap(struct file *file, unsigned long reqprot,
unsigned long prot, unsigned long flags,
unsigned long addr, unsigned long addr_only);
@ -2187,7 +2188,7 @@ static inline int security_file_mmap(struct file *file, unsigned long reqprot,
unsigned long addr,
unsigned long addr_only)
{
return cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
return cap_mmap_addr(addr);
}
static inline int security_file_mprotect(struct vm_area_struct *vma,

2
security/apparmor/lsm.c
View File

@ -497,7 +497,7 @@ static int apparmor_file_mmap(struct file *file, unsigned long reqprot,
int rc = 0;
/* do DAC check */
rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
rc = cap_mmap_addr(addr);
if (rc || addr_only)
return rc;

34
security/commoncap.c
View File

@ -957,6 +957,29 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages)
return __vm_enough_memory(mm, pages, cap_sys_admin);
}
/*
* cap_mmap_addr - check if able to map given addr
* @addr: address attempting to be mapped
*
* If the process is attempting to map memory below dac_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_mmap_addr(unsigned long addr)
{
int ret = 0;
if (addr < dac_mmap_min_addr) {
ret = cap_capable(current_cred(), &init_user_ns, 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;
}
/*
* cap_file_mmap - check if able to map given addr
* @file: unused
@ -975,14 +998,5 @@ 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 < dac_mmap_min_addr) {
ret = cap_capable(current_cred(), &init_user_ns, 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;
return cap_mmap_addr(addr);
}

2
security/selinux/hooks.c
View File

@ -3104,7 +3104,7 @@ static int selinux_file_mmap(struct file *file, unsigned long reqprot,
}
/* do DAC check on address space usage */
rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
rc = cap_mmap_addr(addr);
if (rc || addr_only)
return rc;

2
security/smack/smack_lsm.c
View File

@ -1199,7 +1199,7 @@ static int smack_file_mmap(struct file *file,
int rc;
/* do DAC check on address space usage */
rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
rc = cap_mmap_addr(addr);
if (rc || addr_only)
return rc;