[Trusty,7/7] UBUNTU: SAUCE: mm: Respect FOLL_FORCE/FOLL_COW for thp

From: Keno Fischer <keno@juliacomputing.com>

BugLink: http://bugs.launchpad.net/bugs/1658270

In 19be0eaff ("mm: remove gup_flags FOLL_WRITE games from __get_user_pages()"),
the mm code was changed from unsetting FOLL_WRITE after a COW was resolved to
setting the (newly introduced) FOLL_COW instead. Simultaneously, the check in
gup.c was updated to still allow writes with FOLL_FORCE set if FOLL_COW had
also been set. However, a similar check in huge_memory.c was forgotten. As a
result, remote memory writes to ro regions of memory backed by transparent huge
pages cause an infinite loop in the kernel (handle_mm_fault sets FOLL_COW and
returns 0 causing a retry, but follow_trans_huge_pmd bails out immidiately
because `(flags & FOLL_WRITE) && !pmd_write(*pmd)` is true. While in this
state the process is stil SIGKILLable, but little else works (e.g. no ptrace
attach, no other signals). This is easily reproduced with the following
code (assuming thp are set to always):

    #include <assert.h>
    #include <fcntl.h>
    #include <stdint.h>
    #include <stdio.h>
    #include <string.h>
    #include <sys/mman.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    #include <sys/wait.h>
    #include <unistd.h>

    #define TEST_SIZE 5 * 1024 * 1024

    int main(void) {
      int status;
      pid_t child;
      int fd = open("/proc/self/mem", O_RDWR);
      void *addr = mmap(NULL, TEST_SIZE, PROT_READ,
                        MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
      assert(addr != MAP_FAILED);
      pid_t parent_pid = getpid();
      if ((child = fork()) == 0) {
        void *addr2 = mmap(NULL, TEST_SIZE, PROT_READ | PROT_WRITE,
                           MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
        assert(addr2 != MAP_FAILED);
        memset(addr2, 'a', TEST_SIZE);
        pwrite(fd, addr2, TEST_SIZE, (uintptr_t)addr);
        return 0;
      }
      assert(child == waitpid(child, &status, 0));
      assert(WIFEXITED(status) && WEXITSTATUS(status) == 0);
      return 0;
    }

Fix this by updating follow_trans_huge_pmd in huge_memory.c analogously to
the update in gup.c in the original commit. The same pattern exists in
follow_devmap_pmd. However, we should not be able to reach that check
with FOLL_COW set, so add WARN_ONCE to make sure we notice if we ever
do.

Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Tested-by: David Rientjes <rientjes@google.com>
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Benjamin M Romer <benjamin.romer@canonical.com>
---
 mm/huge_memory.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)