ash: [VAR] Sanitise environment variable names on entry

Upstream commit:

    Date: Sat, 25 Feb 2012 15:35:18 +0800
    [VAR] Sanitise environment variable names on entry

    On Tue, Feb 14, 2012 at 10:48:48AM +0000, harald@redhat.com wrote:
    > "export -p" prints all environment variables, without checking if the
    > environment variable is a valid dash variable name.
    >
    > IMHO, the only valid usecase for "export -p" is to eval the output.
    >
    > $ eval $(export -p); echo OK
    > OK
    >
    > Without this patch the following test does error out with:
    >
    > test.py:
    > import os
    > os.environ["test-test"]="test"
    > os.environ["test_test"]="test"
    > os.execv("./dash", [ './dash', '-c', 'eval $(export -p); echo OK' ])
    >
    > $ python test.py
    > ./dash: 1: export: test-test: bad variable name
    >
    > Of course the results can be more evil, if the environment variable
    > name is crafted, that it injects valid shell code.

    This patch fixes the issue by sanitising all environment variable names
    upon entry into the shell.

    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

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