chantra / rpms / rpm

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From 362c4401979f896de1e69a3e18d33954953912cc Mon Sep 17 00:00:00 2001
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Message-Id: <362c4401979f896de1e69a3e18d33954953912cc.1554983588.git.pmatilai@redhat.com>
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From: Panu Matilainen <pmatilai@redhat.com>
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Date: Tue, 11 Dec 2018 13:21:47 +0200
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Subject: [PATCH] Only read through payload on verify if actually needed
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If none of our verify items ranges over the payload, then why bother?
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To do this, add an internal rpmvs API to get it's range, and use
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that to decide whether trip over the payload is needed or not.
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In addition, the payload digest tag needs to be grabbed outside of the
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condition to avoid depending on other values. The details including
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RPMVSF_NEEDPAYLOAD will be handled internally to rpmvs which makes it
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actually nicer code-wise too.
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---
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 lib/rpmchecksig.c |  8 ++++----
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 lib/rpmvs.c       | 12 ++++++++++++
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 lib/rpmvs.h       |  3 +++
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 3 files changed, 19 insertions(+), 4 deletions(-)
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diff --git a/lib/rpmchecksig.c b/lib/rpmchecksig.c
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index 1ba72a45e..810f7153d 100644
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--- a/lib/rpmchecksig.c
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+++ b/lib/rpmchecksig.c
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@@ -187,11 +187,11 @@ rpmRC rpmpkgRead(struct rpmvs_s *vs, FD_t fd,
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     /* Finalize header range */
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     rpmvsFiniRange(vs, RPMSIG_HEADER);
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-    /* Unless disabled, read the payload, generating digest(s) on the fly. */
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-    if (!(rpmvsFlags(vs) & RPMVSF_NEEDPAYLOAD)) {
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-	/* Fish interesting tags from the main header. This is a bit hacky... */
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-	rpmvsAppendTag(vs, blob, RPMTAG_PAYLOADDIGEST);
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+    /* Fish interesting tags from the main header. This is a bit hacky... */
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+    rpmvsAppendTag(vs, blob, RPMTAG_PAYLOADDIGEST);
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+    /* If needed and not explicitly disabled, read the payload as well. */
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+    if (rpmvsRange(vs) & RPMSIG_PAYLOAD) {
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 	/* Initialize digests ranging over the payload only */
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 	rpmvsInitRange(vs, RPMSIG_PAYLOAD);
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diff --git a/lib/rpmvs.c b/lib/rpmvs.c
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index 622e48011..0d475af86 100644
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--- a/lib/rpmvs.c
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+++ b/lib/rpmvs.c
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@@ -396,6 +396,18 @@ void rpmvsFiniRange(struct rpmvs_s *sis, int range)
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     }
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 }
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+int rpmvsRange(struct rpmvs_s *vs)
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+{
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+    int range = 0;
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+    for (int i = 0; i < vs->nsigs; i++) {
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+	if (rpmsinfoDisabled(&vs->sigs[i], vs->vsflags))
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+	    continue;
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+	range |= vs->sigs[i].range;
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+    }
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+
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+    return range;
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+}
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+
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 static int sinfoCmp(const void *a, const void *b)
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 {
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     const struct rpmsinfo_s *sa = a;
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--- rpm-4.14.3/lib/rpmvs.h.orig	2020-04-28 10:57:19.727347211 +0200
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+++ rpm-4.14.3/lib/rpmvs.h	2020-04-28 10:57:43.622612015 +0200
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@@ -66,6 +66,8 @@
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 void rpmvsFiniRange(struct rpmvs_s *sis, int range);
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+int rpmvsRange(struct rpmvs_s *vs); 
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+
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 int rpmvsVerify(struct rpmvs_s *sis, int type,
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                        rpmsinfoCb cb, void *cbdata);
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-- 
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2.20.1