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vcs-svn: allow import of > 4GiB files

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There is no reason in principle that an svn-format dump would not be
able to represent a file whose length does not fit in a 32-bit
integer.  Use off_t consistently to represent file lengths (in place
of using uint32_t in some contexts) so we can handle that.

Most svn-fe code is already ready to do that without this patch and
passes values of type off_t around.  The type mismatch from stragglers
was noticed with gcc -Wtype-limits.

While at it, tighten the parsing of the Text-content-length field to
make sure it is a number and does not overflow, and tighten other
overflow checks as that value is passed around and manipulated.

Inspired-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2012-02-02 05:03:16 -06:00 committed by Junio C Hamano
parent 173223aa62
commit 150f75467c
3 changed files with 26 additions and 14 deletions
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15
vcs-svn/fast_export.c
View file

@ -227,15 +227,18 @@ static long apply_delta(off_t len, struct line_buffer *input,
return ret;
}
void fast_export_data(uint32_t mode, uint32_t len, struct line_buffer *input)
void fast_export_data(uint32_t mode, off_t len, struct line_buffer *input)
{
assert(len >= 0);
if (mode == REPO_MODE_LNK) {
/* svn symlink blobs start with "link " */
if (len < 5)
die("invalid dump: symlink too short for \"link\" prefix");
len -= 5;
if (buffer_skip_bytes(input, 5) != 5)
die_short_read(input);
}
printf("data %"PRIu32"\n", len);
printf("data %"PRIuMAX"\n", (uintmax_t) len);
if (buffer_copy_bytes(input, len) != len)
die_short_read(input);
fputc('\n', stdout);
@ -297,12 +300,12 @@ int fast_export_ls(const char *path, uint32_t *mode, struct strbuf *dataref)
void fast_export_blob_delta(uint32_t mode,
uint32_t old_mode, const char *old_data,
uint32_t len, struct line_buffer *input)
off_t len, struct line_buffer *input)
{
long postimage_len;
if (len > maximum_signed_value_of_type(off_t))
die("enormous delta");
postimage_len = apply_delta((off_t) len, input, old_data, old_mode);
assert(len >= 0);
postimage_len = apply_delta(len, input, old_data, old_mode);
if (mode == REPO_MODE_LNK) {
buffer_skip_bytes(&postimage, strlen("link "));
postimage_len -= strlen("link ");

4
vcs-svn/fast_export.h
View file

@ -14,10 +14,10 @@ void fast_export_begin_commit(uint32_t revision, const char *author,
const struct strbuf *log, const char *uuid,
const char *url, unsigned long timestamp);
void fast_export_end_commit(uint32_t revision);
void fast_export_data(uint32_t mode, uint32_t len, struct line_buffer *input);
void fast_export_data(uint32_t mode, off_t len, struct line_buffer *input);
void fast_export_blob_delta(uint32_t mode,
uint32_t old_mode, const char *old_data,
uint32_t len, struct line_buffer *input);
off_t len, struct line_buffer *input);
/* If there is no such file at that rev, returns -1, errno == ENOENT. */
int fast_export_ls_rev(uint32_t rev, const char *path,

21
vcs-svn/svndump.c
View file

@ -40,7 +40,8 @@
static struct line_buffer input = LINE_BUFFER_INIT;
static struct {
uint32_t action, propLength, textLength, srcRev, type;
uint32_t action, propLength, srcRev, type;
off_t text_length;
struct strbuf src, dst;
uint32_t text_delta, prop_delta;
} node_ctx;
@ -61,7 +62,7 @@ static void reset_node_ctx(char *fname)
node_ctx.type = 0;
node_ctx.action = NODEACT_UNKNOWN;
node_ctx.propLength = LENGTH_UNKNOWN;
node_ctx.textLength = LENGTH_UNKNOWN;
node_ctx.text_length = -1;
strbuf_reset(&node_ctx.src);
node_ctx.srcRev = 0;
strbuf_reset(&node_ctx.dst);
@ -209,7 +210,7 @@ static void handle_node(void)
{
const uint32_t type = node_ctx.type;
const int have_props = node_ctx.propLength != LENGTH_UNKNOWN;
const int have_text = node_ctx.textLength != LENGTH_UNKNOWN;
const int have_text = node_ctx.text_length != -1;
/*
* Old text for this node:
* NULL - directory or bug
@ -291,12 +292,12 @@ static void handle_node(void)
}
if (!node_ctx.text_delta) {
fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
fast_export_data(node_ctx.type, node_ctx.textLength, &input);
fast_export_data(node_ctx.type, node_ctx.text_length, &input);
return;
}
fast_export_modify(node_ctx.dst.buf, node_ctx.type, "inline");
fast_export_blob_delta(node_ctx.type, old_mode, old_data,
node_ctx.textLength, &input);
node_ctx.text_length, &input);
}
static void begin_revision(void)
@ -409,7 +410,15 @@ void svndump_read(const char *url)
break;
case sizeof("Text-content-length"):
if (!constcmp(t, "Text-content-length")) {
node_ctx.textLength = atoi(val);
char *end;
uintmax_t textlen;
textlen = strtoumax(val, &end, 10);
if (!isdigit(*val) || *end)
die("invalid dump: non-numeric length %s", val);
if (textlen > maximum_signed_value_of_type(off_t))
die("unrepresentable length in dump: %s", val);
node_ctx.text_length = (off_t) textlen;
break;
}
if (constcmp(t, "Prop-content-length"))