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9caf0107a8
We don't have any tests that specifically check boundary
cases in patch_delta(). It obviously gets exercised by tests
which read from packfiles, but it's hard to create packfiles
with bogus deltas.
So let's cover some obvious boundary cases:
1. commands that overflow the result buffer
a. literal content from the delta
b. copies from a base
2. commands where the source isn't large enough
a. literal content from a truncated delta
b. copies that need more bytes than the base has
3. copy commands who parameters are truncated
And indeed, we have problems with both 2a and 3. I've marked
these both as expect_failure, though note that because they
involve reading past the end of a buffer, they will
typically only be caught when run under valgrind or ASan.
There's one more test here, too, which just applies a basic
delta. Since all of the other tests expect failure and we
don't otherwise use "test-tool delta" in the test suite,
this gives a sanity check that the tool works at all.
These are based on an earlier patch by Jann Horn
<jannh@google.com>.
Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
374 lines
13 KiB
Bash
Executable File
374 lines
13 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2008 Nicolas Pitre
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#
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test_description='resilience to pack corruptions with redundant objects'
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. ./test-lib.sh
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# Note: the test objects are created with knowledge of their pack encoding
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# to ensure good code path coverage, and to facilitate direct alteration
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# later on. The assumed characteristics are:
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#
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# 1) blob_2 is a delta with blob_1 for base and blob_3 is a delta with blob2
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# for base, such that blob_3 delta depth is 2;
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#
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# 2) the bulk of object data is uncompressible so the text part remains
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# visible;
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#
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# 3) object header is always 2 bytes.
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create_test_files() {
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test-tool genrandom "foo" 2000 > file_1 &&
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test-tool genrandom "foo" 1800 > file_2 &&
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test-tool genrandom "foo" 1800 > file_3 &&
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echo " base " >> file_1 &&
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echo " delta1 " >> file_2 &&
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echo " delta delta2 " >> file_3 &&
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test-tool genrandom "bar" 150 >> file_2 &&
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test-tool genrandom "baz" 100 >> file_3
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}
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create_new_pack() {
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rm -rf .git &&
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git init &&
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blob_1=$(git hash-object -t blob -w file_1) &&
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blob_2=$(git hash-object -t blob -w file_2) &&
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blob_3=$(git hash-object -t blob -w file_3) &&
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pack=$(printf "$blob_1\n$blob_2\n$blob_3\n" |
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git pack-objects $@ .git/objects/pack/pack) &&
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pack=".git/objects/pack/pack-${pack}" &&
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git verify-pack -v ${pack}.pack
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}
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do_repack() {
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pack=$(printf "$blob_1\n$blob_2\n$blob_3\n" |
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git pack-objects $@ .git/objects/pack/pack) &&
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pack=".git/objects/pack/pack-${pack}"
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}
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do_corrupt_object() {
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ofs=$(git show-index < ${pack}.idx | grep $1 | cut -f1 -d" ") &&
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ofs=$(($ofs + $2)) &&
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chmod +w ${pack}.pack &&
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dd of=${pack}.pack bs=1 conv=notrunc seek=$ofs &&
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test_must_fail git verify-pack ${pack}.pack
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}
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printf '\0' > zero
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test_expect_success \
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'initial setup validation' \
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'create_test_files &&
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create_new_pack &&
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git prune-packed &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in header of first object' \
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'do_corrupt_object $blob_1 0 < zero &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and loose copy of first delta allows for partial recovery' \
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'git prune-packed &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in data of first object' \
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'create_new_pack &&
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git prune-packed &&
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chmod +w ${pack}.pack &&
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perl -i.bak -pe "s/ base /abcdef/" ${pack}.pack &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and loose copy of second object allows for partial recovery' \
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'git prune-packed &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in header of first delta' \
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'create_new_pack &&
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git prune-packed &&
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do_corrupt_object $blob_2 0 < zero &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in data of first delta' \
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'create_new_pack &&
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git prune-packed &&
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chmod +w ${pack}.pack &&
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perl -i.bak -pe "s/ delta1 /abcdefgh/" ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption in delta base reference of first delta (OBJ_REF_DELTA)' \
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'create_new_pack &&
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git prune-packed &&
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do_corrupt_object $blob_2 2 < zero &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption #0 in delta base reference of first delta (OBJ_OFS_DELTA)' \
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'create_new_pack --delta-base-offset &&
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git prune-packed &&
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do_corrupt_object $blob_2 2 < zero &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack --delta-base-offset &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption #1 in delta base reference of first delta (OBJ_OFS_DELTA)' \
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'create_new_pack --delta-base-offset &&
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git prune-packed &&
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printf "\001" | do_corrupt_object $blob_2 2 &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack --delta-base-offset &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and a redundant pack allows for full recovery too' \
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'do_corrupt_object $blob_2 2 < zero &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null &&
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mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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git hash-object -t blob -w file_2 &&
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printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack &&
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git prune-packed &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption of delta base reference pointing to wrong object' \
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'create_new_pack --delta-base-offset &&
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git prune-packed &&
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printf "\220\033" | do_corrupt_object $blob_3 2 &&
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git cat-file blob $blob_1 >/dev/null &&
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git cat-file blob $blob_2 >/dev/null &&
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test_must_fail git cat-file blob $blob_3 >/dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_3 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and then a repack "clears" the corruption' \
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'do_repack --delta-base-offset --no-reuse-delta &&
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git prune-packed &&
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git verify-pack ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corrupting header to have too small output buffer fails unpack' \
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'create_new_pack &&
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git prune-packed &&
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printf "\262\001" | do_corrupt_object $blob_1 0 &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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# \0 - empty base
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# \1 - one byte in result
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# \1 - one literal byte (X)
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test_expect_success \
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'apply good minimal delta' \
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'printf "\0\1\1X" > minimal_delta &&
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test-tool delta -p /dev/null minimal_delta /dev/null'
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# \0 - empty base
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# \1 - 1 byte in result
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# \2 - two literal bytes (one too many)
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test_expect_success \
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'apply delta with too many literal bytes' \
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'printf "\0\1\2XX" > too_big_literal &&
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test_must_fail test-tool delta -p /dev/null too_big_literal /dev/null'
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# \5 - five bytes in base
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# \1 - one byte in result
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# \221 - copy, one byte offset, one byte size
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# \0 - copy from offset 0
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# \2 - copy two bytes (one too many)
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test_expect_success \
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'apply delta with too many copied bytes' \
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'printf "\5\1\221\0\2" > too_big_copy &&
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echo base >base &&
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test_must_fail test-tool delta -p base too_big_copy /dev/null'
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# \0 - empty base
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# \2 - two bytes in result
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# \2 - two literal bytes (we are short one)
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test_expect_failure \
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'apply delta with too few literal bytes' \
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'printf "\0\2\2X" > truncated_delta &&
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test_must_fail test-tool delta -p /dev/null truncated_delta /dev/null'
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# \0 - empty base
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# \1 - one byte in result
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# \221 - copy, one byte offset, one byte size
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# \0 - copy from offset 0
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# \1 - copy one byte (we are short one)
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test_expect_success \
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'apply delta with too few bytes in base' \
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'printf "\0\1\221\0\1" > truncated_base &&
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test_must_fail test-tool delta -p /dev/null truncated_base /dev/null'
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# \5 - five bytes in base
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# \5 - five bytes in result
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# \1 - one literal byte (X)
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# \221 - copy, one byte offset, one byte size
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# (offset/size missing)
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#
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# Note that the literal byte is necessary to get past the uninteresting minimum
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# delta size check.
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test_expect_failure \
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'apply delta with truncated copy parameters' \
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'printf "\5\5\1X\221" > truncated_copy_delta &&
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echo base >base &&
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test_must_fail test-tool delta -p base truncated_copy_delta /dev/null'
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test_done
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