Red Hat Bugzilla – Bug 28509
gcc-2.96-75 miscompiles rpm
Last modified: 2007-04-18 12:31:36 EDT
From Bugzilla Helper:
User-Agent: Mozilla/4.75 [en] (X11; U; Linux 2.2.16-24 alpha)
gcc-2.96-75 (and most versions since Red Hat 7.0) has been miscompiling
Steps to Reproduce:
1. Apply patch to rpm-4.0.2-7x.src.rpm, build and install
2. Attempt to do "rpm --checksig signed package here"
3. Examine debugging output., the short in lead.signature_type has several
values, mostly wrong.
Created attachment 10580 [details]
Debugging patch to display miscompilation.
I get with both -O2 and -O0 build:
*** readLead: signature_type 5
*** rpmCheckSig, after readLead: lead.signature_type 5
*** rpmCheckSig, before rpmReadSignature: l->signature_type 25441
*** rpmReadSignature: sigType 25441
error: /mnt/redhat/comps/dist/7.0.x/i386/openssh-2.3.0p1-4.i386.rpm: rpmReadSignature failed
What is the expected output and why you think it is actually
I'll read it carefully tomorrow.
I had to #undef ALPHA_LOSSAGE because otherwise the fault is in rpm source -
with ALPHA_LOSSAGE defined you rpmLead into one rpmlead structure and read from
a malloced one which was never initialized.
I've managed to minimize this into small testcase, am checking CVS gcc ATM.
2000-08-11 Richard Henderson <email@example.com>
* combine.c (simplify_shift_const): Obey SHIFT_COUNT_TRUNCATED.
which will be included in gcc-2.96-76.
(and you please remove ALPHA_LOSSAGE next time you build rpm).