On 11/7/2017 6:20 PM, Jonathan Tan wrote:
On Tue, 7 Nov 2017 19:35:44 +0000
Jeff Hostetler <g...@jeffhostetler.com> wrote:
+/*
+ * Reject the arg if it contains any characters that might
+ * require quoting or escaping when handing to a sub-command.
+ */
+static int reject_injection_chars(const char *arg)
+{
[snip]
+}
Someone pointed me to quote.{c,h}, which is probably sufficient to
ensure shell safety if we do invoke subcommands through the shell. If
that is so, we probably don't need a blacklist.
Having said that, though, it might be safer to still introduce one, and
relax it later if necessary - it is much easier to relax a constraint
than to increase one.
I couldn't use quote.[ch] because it is more concerned with
quoting pathnames because of LF and CR characters within
them -- rather than semicolons and quotes and the like which
I was concerned about.
Anyway, in my next patch series I've replaced all of the
injection code from my last series with something a little
stronger and not restricting.
+ } else if (skip_prefix(arg, "sparse:", &v0)) {
+
+ if (skip_prefix(v0, "oid=", &v1)) {
+ struct object_context oc;
+ struct object_id sparse_oid;
+ filter_options->choice = LOFC_SPARSE_OID;
+ if (!get_oid_with_context(v1, GET_OID_BLOB,
+ &sparse_oid, &oc))
+ filter_options->sparse_oid_value =
+ oiddup(&sparse_oid);
+ return 0;
+ }
In your recent e-mail [1], you said that you will change it to always pass
the original expression - is that still the plan?
[1]
https://public-inbox.org/git/f698d5a8-bf31-cea1-a8da-88b755b0b...@jeffhostetler.com/
yes. I always pass filter_options.raw_value over the wire.
The code above tries to parse it and put it in an OID for
private use by the current process -- just like the size limit
value in the blob:limit filter.
+/* Remember to update object flag allocation in object.h */
You probably can delete this line.
Every other place that defined flag bits included this comment,
so I did too. (It really made it easier to find the other
random places that define bits, actually.)
+/*
+ * FILTER_SHOWN_BUT_REVISIT -- we set this bit on tree objects
+ * that have been shown, but should be revisited if they appear
+ * in the traversal (until we mark it SEEN). This is a way to
+ * let us silently de-dup calls to show() in the caller.
This is unclear to me at first reading. Maybe something like:
FILTER_SHOWN_BUT_REVISIT -- we set this bit on tree objects that have
been shown, but should not be skipped over if they reappear in the
traversal. This ensures that the tree's descendants are re-processed
if the tree reappears subsequently, and that the tree is not shown
twice.
+ * This
+ * is subtly different from the "revision.h:SHOWN" and the
+ * "sha1_name.c:ONELINE_SEEN" bits. And also different from
+ * the non-de-dup usage in pack-bitmap.c
+ */
Optional: I'm not sure if this comparison is useful. (Maybe it is useful
to others, though.)
I was thinking the first comment about my FILTER_SHOWN field
would be to ask why I wasn't just using the existing SHOWN bit.
There are subtle differences between the bits and I wanted to
point out that I was not just duplicating the usage of an existing
bit.
+/*
+ * A filter driven by a sparse-checkout specification to only
+ * include blobs that a sparse checkout would populate.
+ *
+ * The sparse-checkout spec can be loaded from a blob with the
+ * given OID or from a local pathname. We allow an OID because
+ * the repo may be bare or we may be doing the filtering on the
+ * server.
+ */
+struct frame {
+ /*
+ * defval is the usual default include/exclude value that
+ * should be inherited as we recurse into directories based
+ * upon pattern matching of the directory itself or of a
+ * containing directory.
+ */
+ int defval;
Can this be an "unsigned defval : 1" as well? In the function below, I
see that you assign to an "int val" first (which can take -1, 0, and 1)
before assigning to this, so that is fine.
Also, maybe a better name would be "exclude", with the documentation:
1 if the directory is excluded, 0 otherwise. Excluded directories will
still be recursed through, because an "include" rule for an object
might override an "exclude" rule for one of its ancestors.
The name "defval" is used unpack-trees.c during the clear_ce_flags()
recursion while looking at the exclusion list. I was just trying to
match that behavior.
Thanks
Jeff
