From: Jeff King <peff@xxxxxxxx>
Receive-pack feeds its input to either index-pack or
unpack-objects, which will happily accept as many bytes as
a sender is willing to provide. Let's allow an arbitrary
cutoff point where we will stop writing bytes to disk.
Cleaning up what has already been written to disk is a
related problem that is not addressed by this patch.
Signed-off-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
Documentation/config.txt | 6 +++++
Documentation/git-receive-pack.txt | 3 +++
builtin/receive-pack.c | 12 +++++++++
t/t5546-receive-limits.sh | 55 ++++++++++++++++++++++++++++++++++++++
4 files changed, 76 insertions(+)
create mode 100755 t/t5546-receive-limits.sh
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 0bcb679..8a115b3 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2517,6 +2517,12 @@ receive.unpackLimit::
especially on slow filesystems. If not set, the value of
`transfer.unpackLimit` is used instead.
+receive.maxInputSize::
+ If the size of the incoming pack stream is larger than this
+ limit, then git-receive-pack will error out, instead of
+ accepting the pack file. If not set or set to 0, then the size
+ is unlimited.
+
receive.denyDeletes::
If set to true, git-receive-pack will deny a ref update that deletes
the ref. Use this to prevent such a ref deletion via a push.
diff --git a/Documentation/git-receive-pack.txt b/Documentation/git-receive-pack.txt
index 000ee8d..0ccd5fb 100644
--- a/Documentation/git-receive-pack.txt
+++ b/Documentation/git-receive-pack.txt
@@ -33,6 +33,9 @@ post-update hooks found in the Documentation/howto directory.
option, which tells it if updates to a ref should be denied if they
are not fast-forwards.
+A number of other receive.* config options are available to tweak
+its behavior, see linkgit:git-config[1].
+
OPTIONS
-------
<directory>::
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 011db00..f1ce05c 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -46,6 +46,7 @@ static int transfer_unpack_limit = -1;
static int advertise_atomic_push = 1;
static int advertise_push_options;
static int unpack_limit = 100;
+static off_t max_input_size;
static int report_status;
static int use_sideband;
static int use_atomic;
@@ -212,6 +213,11 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
return 0;
}
+ if (strcmp(var, "receive.maxinputsize") == 0) {
+ max_input_size = git_config_int64(var, value);
+ return 0;
+ }
+
return git_default_config(var, value, cb);
}
@@ -1648,6 +1654,9 @@ static const char *unpack(int err_fd, struct shallow_info *si)
if (fsck_objects)
argv_array_pushf(&child.args, "--strict%s",
fsck_msg_types.buf);
+ if (max_input_size)
+ argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
+ (uintmax_t)max_input_size);
child.no_stdout = 1;
child.err = err_fd;
child.git_cmd = 1;
@@ -1676,6 +1685,9 @@ static const char *unpack(int err_fd, struct shallow_info *si)
fsck_msg_types.buf);
if (!reject_thin)
argv_array_push(&child.args, "--fix-thin");
+ if (max_input_size)
+ argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
+ (uintmax_t)max_input_size);
child.out = -1;
child.err = err_fd;
child.git_cmd = 1;
diff --git a/t/t5546-receive-limits.sh b/t/t5546-receive-limits.sh
new file mode 100755
index 0000000..10cb0be
--- /dev/null
+++ b/t/t5546-receive-limits.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+
+test_description='check receive input limits'
+. ./test-lib.sh
+
+# Let's run tests with different unpack limits: 1 and 10000
+# When the limit is 1, `git receive-pack` will call `git index-pack`.
+# When the limit is 10000, `git receive-pack` will call `git unpack-objects`.
+
+test_pack_input_limit () {
+ case "$1" in
+ index) unpack_limit=1 ;;
+ unpack) unpack_limit=10000 ;;
+ esac
+
+ test_expect_success 'prepare destination repository' '
+ rm -fr dest &&
+ git --bare init dest
+ '
+
+ test_expect_success "set unpacklimit to $unpack_limit" '
+ git --git-dir=dest config receive.unpacklimit "$unpack_limit"
+ '
+
+ test_expect_success 'setting receive.maxInputSize to 512 rejects push' '
+ git --git-dir=dest config receive.maxInputSize 512 &&
+ test_must_fail git push dest HEAD
+ '
+
+ test_expect_success 'bumping limit to 4k allows push' '
+ git --git-dir=dest config receive.maxInputSize 4k &&
+ git push dest HEAD
+ '
+
+ test_expect_success 'prepare destination repository (again)' '
+ rm -fr dest &&
+ git --bare init dest
+ '
+
+ test_expect_success 'lifting the limit allows push' '
+ git --git-dir=dest config receive.maxInputSize 0 &&
+ git push dest HEAD
+ '
+}
+
+test_expect_success "create known-size (1024 bytes) commit" '
+ test-genrandom foo 1024 >one-k &&
+ git add one-k &&
+ test_commit one-k
+'
+
+test_pack_input_limit index
+test_pack_input_limit unpack
+
+test_done
--
2.10.0.rc1.3.g93be2b9
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