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    Subject[PATCH v3 03/12] binfmt_flat: prevent kernel dammage from corrupted executable headers
    Date
    Signed-off-by: Nicolas Pitre <nico@linaro.org>
    ---
    fs/binfmt_flat.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
    index 36f5bb6b2c..9c76d9a222 100644
    --- a/fs/binfmt_flat.c
    +++ b/fs/binfmt_flat.c
    @@ -470,6 +470,17 @@ static int load_flat_file(struct linux_binprm * bprm,
    }

    /*
    + * Make sure the header params are sane.
    + * 28 bits (256 MB) is way more than reasonable in this case.
    + * If some top bits are set we have probable binary corruption.
    + */
    + if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) {
    + pr_err("bad header\n");
    + ret = -ENOEXEC;
    + goto err;
    + }
    +
    + /*
    * fix up the flags for the older format, there were all kinds
    * of endian hacks, this only works for the simple cases
    */
    --
    2.7.4
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