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Blame SOURCES/rpm-4.14.3-more-careful-sig-hdr-copy.patch

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commit d6a86b5e69e46cc283b1e06c92343319beb42e21
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Author: Panu Matilainen <pmatilai@redhat.com>
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Date:   Thu Mar 4 13:21:19 2021 +0200
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    Be much more careful about copying data from the signature header
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    Only look for known tags, and ensure correct type and size where known
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    before copying over. Bump the old arbitrary 16k count limit to 16M limit
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    though, it's not inconceivable that a package could have that many files.
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    While at it, ensure none of these tags exist in the main header,
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    which would confuse us greatly.
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    This is optimized for backporting ease, upstream can remove redundancies
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    and further improve checking later.
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    Reported and initial patches by Demi Marie Obenour.
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    Fixes: RhBug:1935049, RhBug:1933867, RhBug:1935035, RhBug:1934125, ...
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    Fixes: CVE-2021-3421, CVE-2021-20271
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    Combined with e2f1f1931c5ccf3ecbe4e1e12cacb1e17a277776 and backported into
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    4.14.3
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diff -up rpm-4.14.3/lib/package.c.orig rpm-4.14.3/lib/package.c
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--- rpm-4.14.3/lib/package.c.orig	2021-05-31 12:32:49.970393976 +0200
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+++ rpm-4.14.3/lib/package.c	2021-05-31 13:53:58.250673275 +0200
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@@ -31,76 +31,72 @@ struct pkgdata_s {
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     rpmRC rc;
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 };
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+struct taglate_s {
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+    rpmTagVal stag;
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+    rpmTagVal xtag;
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+    rpm_count_t count;
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+    int quirk;
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+} const xlateTags[] = {
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+    { RPMSIGTAG_SIZE, RPMTAG_SIGSIZE, 1, 0 },
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+    { RPMSIGTAG_PGP, RPMTAG_SIGPGP, 0, 0 },
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+    { RPMSIGTAG_MD5, RPMTAG_SIGMD5, 16, 0 },
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+    { RPMSIGTAG_GPG, RPMTAG_SIGGPG, 0, 0 },
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+    /* { RPMSIGTAG_PGP5, RPMTAG_SIGPGP5, 0, 0 }, */ /* long obsolete, dont use */
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+    { RPMSIGTAG_PAYLOADSIZE, RPMTAG_ARCHIVESIZE, 1, 1 },
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+    { RPMSIGTAG_SHA1, RPMTAG_SHA1HEADER, 1, 0 },
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+    { RPMSIGTAG_SHA256, RPMTAG_SHA256HEADER, 1, 0 },
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+    { RPMSIGTAG_DSA, RPMTAG_DSAHEADER, 0, 0 },
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+    { RPMSIGTAG_RSA, RPMTAG_RSAHEADER, 0, 0 },
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+    { RPMSIGTAG_LONGSIZE, RPMTAG_LONGSIGSIZE, 1, 0 },
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+    { RPMSIGTAG_LONGARCHIVESIZE, RPMTAG_LONGARCHIVESIZE, 1, 0 },
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+    { 0 }
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+};
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+
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 /** \ingroup header
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  * Translate and merge legacy signature tags into header.
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  * @param h		header (dest)
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  * @param sigh		signature header (src)
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+ * @return		failing tag number, 0 on success
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  */
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 static
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-void headerMergeLegacySigs(Header h, Header sigh)
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+rpmTagVal headerMergeLegacySigs(Header h, Header sigh, char **msg)
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 {
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-    HeaderIterator hi;
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+    const struct taglate_s *xl;
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     struct rpmtd_s td;
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-    hi = headerInitIterator(sigh);
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-    for (; headerNext(hi, &td); rpmtdFreeData(&td))
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-    {
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-	switch (td.tag) {
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-	/* XXX Translate legacy signature tag values. */
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-	case RPMSIGTAG_SIZE:
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-	    td.tag = RPMTAG_SIGSIZE;
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-	    break;
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-	case RPMSIGTAG_PGP:
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-	    td.tag = RPMTAG_SIGPGP;
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-	    break;
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-	case RPMSIGTAG_MD5:
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-	    td.tag = RPMTAG_SIGMD5;
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-	    break;
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-	case RPMSIGTAG_GPG:
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-	    td.tag = RPMTAG_SIGGPG;
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-	    break;
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-	case RPMSIGTAG_PGP5:
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-	    td.tag = RPMTAG_SIGPGP5;
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-	    break;
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-	case RPMSIGTAG_PAYLOADSIZE:
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-	    td.tag = RPMTAG_ARCHIVESIZE;
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-	    break;
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-	case RPMSIGTAG_SHA1:
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-	case RPMSIGTAG_SHA256:
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-	case RPMSIGTAG_DSA:
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-	case RPMSIGTAG_RSA:
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-	default:
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-	    if (!(td.tag >= HEADER_SIGBASE && td.tag < HEADER_TAGBASE))
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+    rpmtdReset(&td);
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+    for (xl = xlateTags; xl->stag; xl++) {
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+	/* There mustn't be one in the main header */
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+	if (headerIsEntry(h, xl->xtag)) {
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+	    /* Some tags may exist in either header, but never both */
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+	    if (xl->quirk && !headerIsEntry(sigh, xl->stag))
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 		continue;
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 	    break;
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 	}
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-	if (!headerIsEntry(h, td.tag)) {
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-	    switch (td.type) {
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-	    case RPM_NULL_TYPE:
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-		continue;
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+	if (headerGet(sigh, xl->stag, &td, HEADERGET_RAW|HEADERGET_MINMEM)) {
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+	    /* Translate legacy tags */
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+	    if (xl->stag != xl->xtag)
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+		td.tag = xl->xtag;
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+	    /* Ensure type and tag size match expectations */
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+	    if (td.type != rpmTagGetTagType(td.tag))
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 		break;
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-	    case RPM_CHAR_TYPE:
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-	    case RPM_INT8_TYPE:
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-	    case RPM_INT16_TYPE:
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-	    case RPM_INT32_TYPE:
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-	    case RPM_INT64_TYPE:
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-		if (td.count != 1)
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-		    continue;
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+	    if (td.count < 1 || td.count > 16*1024*1024)
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 		break;
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-	    case RPM_STRING_TYPE:
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-	    case RPM_BIN_TYPE:
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-		if (td.count >= 16*1024)
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-		    continue;
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+	    if (xl->count && td.count != xl->count)
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 		break;
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-	    case RPM_STRING_ARRAY_TYPE:
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-	    case RPM_I18NSTRING_TYPE:
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-		continue;
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+	    if (!headerPut(h, &td, HEADERPUT_DEFAULT))
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 		break;
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-	    }
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-	    (void) headerPut(h, &td, HEADERPUT_DEFAULT);
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+	    rpmtdFreeData(&td);
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 	}
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     }
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-    headerFreeIterator(hi);
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+    rpmtdFreeData(&td);
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+
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+    if (xl->stag) {
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+	rasprintf(msg, "invalid signature tag %s (%d)",
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+			rpmTagGetName(xl->xtag), xl->xtag);
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+    }
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+
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+    return xl->stag;
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 }
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 /**
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@@ -363,7 +359,8 @@ rpmRC rpmReadPackageFile(rpmts ts, FD_t
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 		goto exit;
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 	    /* Append (and remap) signature tags to the metadata. */
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-	    headerMergeLegacySigs(h, sigh);
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+	    if (headerMergeLegacySigs(h, sigh, &msg))
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+		goto exit;
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 	    applyRetrofits(h);
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 	    /* Bump reference count for return. */