From 44e5471a8d8ec5f04058220f8b91513b5b5accaa Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ren=C3=A9=20Scharfe?= Date: Tue, 27 Jun 2017 19:03:47 +0200 Subject: [PATCH] apply: check git diffs for invalid file modes An empty string as mode specification is accepted silently by git apply, as Vegard Nossum found out using AFL. It's interpreted as zero. Reject such bogus file modes, and only accept ones consisting exclusively of octal digits. Reported-by: Vegard Nossum Signed-off-by: Rene Scharfe Signed-off-by: Junio C Hamano --- apply.c | 17 ++++++++++++----- t/t4129-apply-samemode.sh | 16 +++++++++++++++- 2 files changed, 27 insertions(+), 6 deletions(-) diff --git a/apply.c b/apply.c index 1c0bcd737..4b689d9bf 100644 --- a/apply.c +++ b/apply.c @@ -1011,20 +1011,27 @@ static int gitdiff_newname(struct apply_state *state, DIFF_NEW_NAME); } +static int parse_mode_line(const char *line, int linenr, unsigned int *mode) +{ + char *end; + *mode = strtoul(line, &end, 8); + if (end == line || !isspace(*end)) + return error(_("invalid mode on line %d: %s"), linenr, line); + return 0; +} + static int gitdiff_oldmode(struct apply_state *state, const char *line, struct patch *patch) { - patch->old_mode = strtoul(line, NULL, 8); - return 0; + return parse_mode_line(line, state->linenr, &patch->old_mode); } static int gitdiff_newmode(struct apply_state *state, const char *line, struct patch *patch) { - patch->new_mode = strtoul(line, NULL, 8); - return 0; + return parse_mode_line(line, state->linenr, &patch->new_mode); } static int gitdiff_delete(struct apply_state *state, @@ -1138,7 +1145,7 @@ static int gitdiff_index(struct apply_state *state, memcpy(patch->new_sha1_prefix, line, len); patch->new_sha1_prefix[len] = 0; if (*ptr == ' ') - patch->old_mode = strtoul(ptr+1, NULL, 8); + return gitdiff_oldmode(state, ptr + 1, patch); return 0; } diff --git a/t/t4129-apply-samemode.sh b/t/t4129-apply-samemode.sh index c268298ea..5cdd76dfa 100755 --- a/t/t4129-apply-samemode.sh +++ b/t/t4129-apply-samemode.sh @@ -13,7 +13,9 @@ test_expect_success setup ' echo modified >file && git diff --stat -p >patch-0.txt && chmod +x file && - git diff --stat -p >patch-1.txt + git diff --stat -p >patch-1.txt && + sed "s/^\(new mode \).*/\1/" patch-empty-mode.txt && + sed "s/^\(new mode \).*/\1garbage/" patch-bogus-mode.txt ' test_expect_success FILEMODE 'same mode (no index)' ' @@ -59,4 +61,16 @@ test_expect_success FILEMODE 'mode update (index only)' ' git ls-files -s file | grep "^100755" ' +test_expect_success FILEMODE 'empty mode is rejected' ' + git reset --hard && + test_must_fail git apply patch-empty-mode.txt 2>err && + test_i18ngrep "invalid mode" err +' + +test_expect_success FILEMODE 'bogus mode is rejected' ' + git reset --hard && + test_must_fail git apply patch-bogus-mode.txt 2>err && + test_i18ngrep "invalid mode" err +' + test_done -- 2.11.0