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    Subject[PATCH 133/222] ARM: missing ->mmap_sem around find_vma() in swp_emulate.c
    Date
    3.5.7.3 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Al Viro <viro@ZenIV.linux.org.uk>

    commit 7bf9b7bef881aac820bf1f2e9951a17b09bd7e04 upstream.

    find_vma() is *not* safe when somebody else is removing vmas. Not just
    the return value might get bogus just as you are getting it (this instance
    doesn't try to dereference the resulting vma), the search itself can get
    buggered in rather spectacular ways. IOW, ->mmap_sem really, really is
    not optional here.

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
    Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    ---
    arch/arm/kernel/swp_emulate.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
    index df74518..ab1017b 100644
    --- a/arch/arm/kernel/swp_emulate.c
    +++ b/arch/arm/kernel/swp_emulate.c
    @@ -109,10 +109,12 @@ static void set_segfault(struct pt_regs *regs, unsigned long addr)
    {
    siginfo_t info;

    + down_read(&current->mm->mmap_sem);
    if (find_vma(current->mm, addr) == NULL)
    info.si_code = SEGV_MAPERR;
    else
    info.si_code = SEGV_ACCERR;
    + up_read(&current->mm->mmap_sem);

    info.si_signo = SIGSEGV;
    info.si_errno = 0;
    --
    1.7.9.5


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