rpm: fix rpm -Kv xxx.rpm failed if signature header is larger than 64KB

Since commits [Place file signatures into the signature header where they
belong][1] applied, run `rpm -Kv **.rpm' failed if signature header
is larger than 64KB. Here are steps:

1) A unsigned rpm package, the size is 227560 bytes
$ ls -al xz-src-5.2.5-r0.corei7_64.rpm
-rw-------. 1 mockbuild 1000 227560 Jun  3 09:59

2) Sign the rpm package
$ rpmsign --addsign ... xz-src-5.2.5-r0.corei7_64.rpm

3) The size of signed rpm is 312208 bytes
$ ls -al xz-src-5.2.5-r0.corei7_64.rpm
-rw-------. 1 mockbuild 1000 312208 Jun  3 09:48

4) Run `rpm -Kv' failed with signature hdr data out of range
$ rpm -Kv xz-src-5.2.5-r0.corei7_64.rpm
xz-src-5.2.5-r0.corei7_64.rpm:
error: xz-src-5.2.5-r0.corei7_64.rpm: signature hdr data: BAD, no. of
bytes(88864) out of range

>From 1) and 3), the size of signed rpm package increased
312208 - 227560 = 84648, so the check of dl_max (64KB,65536)
is not enough.

As [1] said:

    This also means the signature header can be MUCH bigger than ever
    before,so bump up the limit (to 64MB, arbitrary something for now)

So [1] missed to multiply by 1024.

[1] https://github.com/rpm-software-management/rpm/commit/f558e886050c4e98f6cdde391df679a411b3f62c

(From OE-Core rev: 8359bdd60afafd80d354f7f40ed648643d8db292)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/rpm/files/0001-Bump-up-the-limit-of-signature-header-to-64MB.patch

@@ -0,0 +1,62 @@
+From e8bf0eba7143abb6e69db82ee747a0c6790dd00a Mon Sep 17 00:00:00 2001
+From: Hongxu Jia <hongxu.jia@windriver.com>
+Date: Wed, 3 Jun 2020 10:25:24 +0800
+Subject: [PATCH] Bump up the limit of signature header to 64MB
+
+Since commits [Place file signatures into the signature header where they
+belong][1] applied, run `rpm -Kv **.rpm' failed if signature header
+is larger than 64KB. Here are steps:
+
+1) A unsigned rpm package, the size is 227560 bytes
+$ ls -al xz-src-5.2.5-r0.corei7_64.rpm
+-rw-------. 1 mockbuild 1000 227560 Jun  3 09:59
+
+2) Sign the rpm package
+$ rpmsign --addsign ... xz-src-5.2.5-r0.corei7_64.rpm
+
+3) The size of signed rpm is 312208 bytes
+$ ls -al xz-src-5.2.5-r0.corei7_64.rpm
+-rw-------. 1 mockbuild 1000 312208 Jun  3 09:48
+
+4) Run `rpm -Kv' failed with signature hdr data out of range
+$ rpm -Kv xz-src-5.2.5-r0.corei7_64.rpm
+xz-src-5.2.5-r0.corei7_64.rpm:
+error: xz-src-5.2.5-r0.corei7_64.rpm: signature hdr data: BAD, no. of
+bytes(88864) out of range
+
+From 1) and 3), the size of signed rpm package increased
+312208 - 227560 = 84648, so the check of dl_max (64KB,65536)
+is not enough.
+
+As [1] said:
+
+    This also means the signature header can be MUCH bigger than ever
+    before,so bump up the limit (to 64MB, arbitrary something for now)
+
+So [1] missed to multiply by 1024.
+
+[1] https://github.com/rpm-software-management/rpm/commit/f558e886050c4e98f6cdde391df679a411b3f62c
+
+Upstream-Status: Backport [https://github.com/rpm-software-management/rpm/commit/486579912381ede82172dc6d0ff3941a6d0536b5]
+
+Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
+---
+ lib/header.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/header.c b/lib/header.c
+index 9ec7ed0..cbf6890 100644
+--- a/lib/header.c
++++ b/lib/header.c
+@@ -1906,7 +1906,7 @@ rpmRC hdrblobRead(FD_t fd, int magic, int exact_size, rpmTagVal regionTag, hdrbl
+ 
+     if (regionTag == RPMTAG_HEADERSIGNATURES) {
+ 	il_max = 32;
+-	dl_max = 64 * 1024;
++	dl_max = 64 * 1024 * 1024;
+     }
+ 
+     memset(block, 0, sizeof(block));
+-- 
+2.25.4
+

meta/recipes-devtools/rpm/rpm_4.15.1.bb

@@ -40,6 +40,7 @@ SRC_URI = "git://github.com/rpm-software-management/rpm;branch=rpm-4.15.x \
            file://0001-rpmplugins.c-call-dlerror-prior-to-dlsym.patch \
            file://0001-rpmfc.c-do-not-run-file-classification-in-parallel.patch \
            file://0001-lib-transaction.c-fix-file-conflicts-for-MIPS64-N32.patch \
+           file://0001-Bump-up-the-limit-of-signature-header-to-64MB.patch \
            "
 
 PE = "1"