git-commit-vandalism/t/t5100-mailinfo.sh
Phillip Wood 3ef1494685 mailinfo -b: fix an out of bounds access
To remove bracketed strings containing "PATCH" from the subject line
cleanup_subject() scans the subject for the opening bracket using an
offset from the beginning of the line. It then searches for the
closing bracket with strchr(). To calculate the length of the
bracketed string it unfortunately adds rather than subtracts the
offset from the result of strchr(). This leads to an out of bounds
access in memmem() when looking to see if the brackets contain
"PATCH".

We have tests that trigger this bug that were added in ae52d57f0b
(t5100: add some more mailinfo tests, 2017-05-31). The commit message
mentions that they are marked test_expect_failure as they trigger an
assertion in strbuf_splice(). While it is reassuring that
strbuf_splice() detects the problem and dies in retrospect that should
perhaps have warranted a little more investigation. The bug was
introduced by 17635fc900 (mailinfo: -b option keeps [bracketed]
strings that is not a [PATCH] marker, 2009-07-15). I think the reason
it has survived so long is that '-b' is not a popular option and
without it the offset is always zero.

This was found by the address sanitizer while I was cleaning up the
test_todo idea in [1].

[1] https://lore.kernel.org/git/db558292-2783-3270-4824-43757822a389@gmail.com/

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-10-03 09:05:07 -07:00

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
test_description='git mailinfo and git mailsplit test'
. ./test-lib.sh
DATA="$TEST_DIRECTORY/t5100"
test_expect_success 'split sample box' \
'git mailsplit -o. "$DATA/sample.mbox" >last &&
last=$(cat last) &&
echo total is $last &&
test $(cat last) = 18'
check_mailinfo () {
mail=$1 opt=$2
mo="$mail$opt"
git mailinfo -u $opt "msg$mo" "patch$mo" <"$mail" >"info$mo" &&
test_cmp "$DATA/msg$mo" "msg$mo" &&
test_cmp "$DATA/patch$mo" "patch$mo" &&
test_cmp "$DATA/info$mo" "info$mo"
}
for mail in 00*
do
test_expect_success "mailinfo $mail" '
check_mailinfo "$mail" "" &&
if test -f "$DATA/msg$mail--scissors"
then
check_mailinfo "$mail" --scissors
fi &&
if test -f "$DATA/msg$mail--no-inbody-headers"
then
check_mailinfo "$mail" --no-inbody-headers
fi &&
if test -f "$DATA/msg$mail--message-id"
then
check_mailinfo "$mail" --message-id
fi
'
done
test_expect_success 'split box with rfc2047 samples' \
'mkdir rfc2047 &&
git mailsplit -orfc2047 "$DATA/rfc2047-samples.mbox" \
>rfc2047/last &&
last=$(cat rfc2047/last) &&
echo total is $last &&
test $(cat rfc2047/last) = 11'
for mail in rfc2047/00*
do
test_expect_success "mailinfo $mail" '
git mailinfo -u "$mail-msg" "$mail-patch" <"$mail" >"$mail-info" &&
echo msg &&
test_cmp "$DATA/empty" "$mail-msg" &&
echo patch &&
test_cmp "$DATA/empty" "$mail-patch" &&
echo info &&
test_cmp "$DATA/rfc2047-info-$(basename $mail)" "$mail-info"
'
done
test_expect_success 'respect NULs' '
git mailsplit -d3 -o. "$DATA/nul-plain" &&
test_cmp "$DATA/nul-plain" 001 &&
(cat 001 | git mailinfo msg patch) &&
test_line_count = 4 patch
'
test_expect_success 'Preserve NULs out of MIME encoded message' '
git mailsplit -d5 -o. "$DATA/nul-b64.in" &&
test_cmp "$DATA/nul-b64.in" 00001 &&
git mailinfo msg patch <00001 &&
test_cmp "$DATA/nul-b64.expect" patch
'
test_expect_success 'mailinfo on from header without name works' '
mkdir info-from &&
git mailsplit -oinfo-from "$DATA/info-from.in" &&
test_cmp "$DATA/info-from.in" info-from/0001 &&
git mailinfo info-from/msg info-from/patch \
<info-from/0001 >info-from/out &&
test_cmp "$DATA/info-from.expect" info-from/out
'
test_expect_success 'mailinfo finds headers after embedded From line' '
mkdir embed-from &&
git mailsplit -oembed-from "$DATA/embed-from.in" &&
test_cmp "$DATA/embed-from.in" embed-from/0001 &&
git mailinfo embed-from/msg embed-from/patch \
<embed-from/0001 >embed-from/out &&
test_cmp "$DATA/embed-from.expect" embed-from/out
'
test_expect_success 'mailinfo on message with quoted >From' '
mkdir quoted-from &&
git mailsplit -oquoted-from "$DATA/quoted-from.in" &&
test_cmp "$DATA/quoted-from.in" quoted-from/0001 &&
git mailinfo quoted-from/msg quoted-from/patch \
<quoted-from/0001 >quoted-from/out &&
test_cmp "$DATA/quoted-from.expect" quoted-from/msg
'
test_expect_success 'mailinfo unescapes with --mboxrd' '
mkdir mboxrd &&
git mailsplit -omboxrd --mboxrd \
"$DATA/sample.mboxrd" >last &&
test x"$(cat last)" = x2 &&
for i in 0001 0002
do
git mailinfo mboxrd/msg mboxrd/patch \
<mboxrd/$i >mboxrd/out &&
test_cmp "$DATA/${i}mboxrd" mboxrd/msg || return 1
done &&
sp=" " &&
echo "From " >expect &&
echo "From " >>expect &&
echo >> expect &&
cat >sp <<-INPUT_END &&
From mboxrd Mon Sep 17 00:00:00 2001
From: trailing spacer <sp@example.com>
Subject: [PATCH] a commit with trailing space
From$sp
>From$sp
INPUT_END
git mailsplit -f2 -omboxrd --mboxrd <sp >last &&
test x"$(cat last)" = x1 &&
git mailinfo mboxrd/msg mboxrd/patch <mboxrd/0003 &&
test_cmp expect mboxrd/msg
'
test_expect_success 'mailinfo handles rfc2822 quoted-string' '
mkdir quoted-string &&
git mailinfo /dev/null /dev/null <"$DATA/quoted-string.in" \
>quoted-string/info &&
test_cmp "$DATA/quoted-string.expect" quoted-string/info
'
test_expect_success 'mailinfo handles rfc2822 comment' '
mkdir comment &&
git mailinfo /dev/null /dev/null <"$DATA/comment.in" \
>comment/info &&
test_cmp "$DATA/comment.expect" comment/info
'
test_expect_success 'mailinfo with mailinfo.scissors config' '
test_config mailinfo.scissors true &&
(
mkdir sub &&
cd sub &&
git mailinfo ../msg0014.sc ../patch0014.sc <../0014 >../info0014.sc
) &&
test_cmp "$DATA/msg0014--scissors" msg0014.sc &&
test_cmp "$DATA/patch0014--scissors" patch0014.sc &&
test_cmp "$DATA/info0014--scissors" info0014.sc
'
test_expect_success 'mailinfo no options' '
subj="$(echo "Subject: [PATCH] [other] [PATCH] message" |
git mailinfo /dev/null /dev/null)" &&
test z"$subj" = z"Subject: message"
'
test_expect_success 'mailinfo -k' '
subj="$(echo "Subject: [PATCH] [other] [PATCH] message" |
git mailinfo -k /dev/null /dev/null)" &&
test z"$subj" = z"Subject: [PATCH] [other] [PATCH] message"
'
test_expect_success 'mailinfo -b no [PATCH]' '
subj="$(echo "Subject: [other] message" |
git mailinfo -b /dev/null /dev/null)" &&
test z"$subj" = z"Subject: [other] message"
'
test_expect_success 'mailinfo -b leading [PATCH]' '
subj="$(echo "Subject: [PATCH] [other] message" |
git mailinfo -b /dev/null /dev/null)" &&
test z"$subj" = z"Subject: [other] message"
'
test_expect_success 'mailinfo -b double [PATCH]' '
subj="$(echo "Subject: [PATCH] [PATCH] message" |
git mailinfo -b /dev/null /dev/null)" &&
test z"$subj" = z"Subject: message"
'
test_expect_success 'mailinfo -b trailing [PATCH]' '
subj="$(echo "Subject: [other] [PATCH] message" |
git mailinfo -b /dev/null /dev/null)" &&
test z"$subj" = z"Subject: [other] message"
'
test_expect_success 'mailinfo -b separated double [PATCH]' '
subj="$(echo "Subject: [PATCH] [other] [PATCH] message" |
git mailinfo -b /dev/null /dev/null)" &&
test z"$subj" = z"Subject: [other] message"
'
test_expect_success 'mailinfo handles unusual header whitespace' '
git mailinfo /dev/null /dev/null >actual <<-\EOF &&
From:Real Name <user@example.com>
Subject: extra spaces
EOF
cat >expect <<-\EOF &&
Author: Real Name
Email: user@example.com
Subject: extra spaces
EOF
test_cmp expect actual
'
check_quoted_cr_mail () {
mail="$1" && shift &&
git mailinfo -u "$@" "$mail.msg" "$mail.patch" \
<"$mail" >"$mail.info" 2>"$mail.err" &&
test_cmp "$mail-expected.msg" "$mail.msg" &&
test_cmp "$mail-expected.patch" "$mail.patch" &&
test_cmp "$DATA/quoted-cr-info" "$mail.info"
}
test_expect_success 'split base64 email with quoted-cr' '
mkdir quoted-cr &&
git mailsplit -oquoted-cr "$DATA/quoted-cr.mbox" >quoted-cr/last &&
test $(cat quoted-cr/last) = 2
'
test_expect_success 'mailinfo warn CR in base64 encoded email' '
sed -e "s/%%$//" -e "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-msg" \
>quoted-cr/0001-expected.msg &&
sed "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-msg" \
>quoted-cr/0002-expected.msg &&
sed -e "s/%%$//" -e "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-patch" \
>quoted-cr/0001-expected.patch &&
sed "s/%%/$(printf \\015)/g" "$DATA/quoted-cr-patch" \
>quoted-cr/0002-expected.patch &&
check_quoted_cr_mail quoted-cr/0001 &&
test_must_be_empty quoted-cr/0001.err &&
check_quoted_cr_mail quoted-cr/0002 &&
grep "quoted CRLF detected" quoted-cr/0002.err &&
check_quoted_cr_mail quoted-cr/0001 --quoted-cr=nowarn &&
test_must_be_empty quoted-cr/0001.err &&
check_quoted_cr_mail quoted-cr/0002 --quoted-cr=nowarn &&
test_must_be_empty quoted-cr/0002.err &&
cp quoted-cr/0001-expected.msg quoted-cr/0002-expected.msg &&
cp quoted-cr/0001-expected.patch quoted-cr/0002-expected.patch &&
check_quoted_cr_mail quoted-cr/0001 --quoted-cr=strip &&
test_must_be_empty quoted-cr/0001.err &&
check_quoted_cr_mail quoted-cr/0002 --quoted-cr=strip &&
test_must_be_empty quoted-cr/0002.err
'
test_done