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70d75e8996
Backport fixes for: * CVE-2020-27749 - Upstream-Status: Backport from https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=c6c426e5ab6ea715153b72584de6bd8c82f698ec && https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=b1c9e9e889e4273fb15712051c887e6078511448 && https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=3d157bbd06506b170fde5ec23980c4bf9f7660e2 && https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=8bc817014ce3d7a498db44eae33c8b90e2430926 && https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=030fb6c4fa354cdbd6a8d6903dfed5d36eaf3cb2 && https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=4ea7bae51f97e49c84dc67ea30b466ca8633b9f6 * CVE-2021-20225 - Upstream-Status: Backport from https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=2a330dba93ff11bc00eda76e9419bc52b0c7ead6 * CVE-2021-20233 - Upstream-Status: Backport from https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=2f533a89a8dfcacbf2c9dbc77d910f111f24bf33 (From OE-Core rev: 636aab87bc7e10b4ce0bdaa00dd01416a590a801) Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com> Signed-off-by: Steve Sakoman <steve@sakoman.com>
59 lines
1.8 KiB
Diff
59 lines
1.8 KiB
Diff
From 2a330dba93ff11bc00eda76e9419bc52b0c7ead6 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Fri, 22 Jan 2021 16:07:29 +1100
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Subject: lib/arg: Block repeated short options that require an argument
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Fuzzing found the following crash:
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search -hhhhhhhhhhhhhf
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We didn't allocate enough option space for 13 hints because the
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allocation code counts the number of discrete arguments (i.e. argc).
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However, the shortopt parsing code will happily keep processing
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a combination of short options without checking if those short
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options require an argument. This means you can easily end writing
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past the allocated option space.
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This fixes a OOB write which can cause heap corruption.
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Fixes: CVE-2021-20225
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Reported-by: Daniel Axtens <dja@axtens.net>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?h=grub-2.06&id=2a330dba93ff11bc00eda76e9419bc52b0c7ead6]
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CVE: CVE-2021-20225
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Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
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---
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grub-core/lib/arg.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/grub-core/lib/arg.c b/grub-core/lib/arg.c
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index 3288609..537c5e9 100644
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--- a/grub-core/lib/arg.c
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+++ b/grub-core/lib/arg.c
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@@ -299,6 +299,19 @@ grub_arg_parse (grub_extcmd_t cmd, int argc, char **argv,
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it can have an argument value. */
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if (*curshort)
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{
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+ /*
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+ * Only permit further short opts if this one doesn't
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+ * require a value.
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+ */
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+ if (opt->type != ARG_TYPE_NONE &&
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+ !(opt->flags & GRUB_ARG_OPTION_OPTIONAL))
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+ {
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+ grub_error (GRUB_ERR_BAD_ARGUMENT,
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+ N_("missing mandatory option for `%s'"),
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+ opt->longarg);
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+ goto fail;
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+ }
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+
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if (parse_option (cmd, opt, 0, usr) || grub_errno)
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goto fail;
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}
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--
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2.25.1
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