mm: /proc/pid/pagemap: hide swap entries from unprivileged users

[ Upstream commit ab6ecf247a9321e3180e021a6a60164dee53ab2e ]

In commit ab676b7d6fbf ("pagemap: do not leak physical addresses to
non-privileged userspace"), the /proc/PID/pagemap is restricted to be
readable only by CAP_SYS_ADMIN to address some security issue.

In commit 1c90308e7a77 ("pagemap: hide physical addresses from
non-privileged users"), the restriction is relieved to make
/proc/PID/pagemap readable, but hide the physical addresses for
non-privileged users.

But the swap entries are readable for non-privileged users too.  This
has some security issues.  For example, for page under migrating, the
swap entry has physical address information.  So, in this patch, the
swap entries are hided for non-privileged users too.

Link: http://lkml.kernel.org/r/20180508012745.7238-1-ying.huang@intel.com
Fixes: 1c90308e7a77 ("pagemap: hide physical addresses from non-privileged users")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Andrei Vagin <avagin@openvz.org>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Daniel Colascione <dancol@google.com>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 6f337fff38c4acdc81a8f822fed8ddeecd5788ce..519522d39bdeb146198ef6700717f16dc1cb767b 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1275,8 +1275,9 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
                if (pte_swp_soft_dirty(pte))
                        flags |= PM_SOFT_DIRTY;
                entry = pte_to_swp_entry(pte);
-               frame = swp_type(entry) |
-                       (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
+               if (pm->show_pfn)
+                       frame = swp_type(entry) |
+                               (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
                flags |= PM_SWAP;
                if (is_migration_entry(entry))
                        page = migration_entry_to_page(entry);
@@ -1327,11 +1328,14 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
                else if (is_swap_pmd(pmd)) {
                        swp_entry_t entry = pmd_to_swp_entry(pmd);
-                       unsigned long offset = swp_offset(entry);
+                       unsigned long offset;
 
-                       offset += (addr & ~PMD_MASK) >> PAGE_SHIFT;
-                       frame = swp_type(entry) |
-                               (offset << MAX_SWAPFILES_SHIFT);
+                       if (pm->show_pfn) {
+                               offset = swp_offset(entry) +
+                                       ((addr & ~PMD_MASK) >> PAGE_SHIFT);
+                               frame = swp_type(entry) |
+                                       (offset << MAX_SWAPFILES_SHIFT);
+                       }
                        flags |= PM_SWAP;
                        if (pmd_swp_soft_dirty(pmd))
                                flags |= PM_SOFT_DIRTY;
@@ -1349,10 +1353,12 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
                        err = add_to_pagemap(addr, &pme, pm);
                        if (err)
                                break;
-                       if (pm->show_pfn && (flags & PM_PRESENT))
-                               frame++;
-                       else if (flags & PM_SWAP)
-                               frame += (1 << MAX_SWAPFILES_SHIFT);
+                       if (pm->show_pfn) {
+                               if (flags & PM_PRESENT)
+                                       frame++;
+                               else if (flags & PM_SWAP)
+                                       frame += (1 << MAX_SWAPFILES_SHIFT);
+                       }
                }
                spin_unlock(ptl);
                return err;