In %trace mode, evaluating a macro which is undefined causes an invalid
read of 1 byte when searching for the end of the string:
trillian:~$ valgrind rpmspec --eval '%trace' --eval '%{?myUndefinedMacro}'
==21534== Memcheck, a memory error detector
==21534== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==21534== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info
==21534== Command: rpmspec --trace --eval %{?myUndefinedMacro}
==21534==
1> %{?myUndefinedMacro}^==21534== Invalid read of size 1
==21534==at 0x55018D4: printMacro (macro.c:296)
==21534==by 0x5502DFC: expandMacro (macro.c:1077)
==21534==by 0x5503710: doExpandMacros (macro.c:1280)
==21534==by 0x5504AB6: rpmExpand (macro.c:1629)
==21534==by 0x508F59A: rpmcliAllArgCallback (poptALL.c:120)
==21534==by 0x6DAF71D: invokeCallbacksOPTION (popt.c:156)
==21534==by 0x6DAF75B: invokeCallbacksOPTION (popt.c:139)
==21534==by 0x6DB1428: poptGetNextOpt (popt.c:1515)
==21534==by 0x508F912: rpmcliInit (poptALL.c:302)
==21534==by 0x1095B2: main (rpmspec.c:63)
==21534== Address 0x8a010f3 is 0 bytes after a block of size 19 alloc'd
==21534==at 0x4C2DB9D: malloc (vg_replace_malloc.c:299)
==21534==by 0x5507C17: rmalloc (rpmmalloc.c:44)
==21534==by 0x5502788: expandMacro (macro.c:927)
==21534==by 0x5503710: doExpandMacros (macro.c:1280)
==21534==by 0x5504AB6: rpmExpand (macro.c:1629)
==21534==by 0x508F59A: rpmcliAllArgCallback (poptALL.c:120)
==21534==by 0x6DAF71D: invokeCallbacksOPTION (popt.c:156)
==21534==by 0x6DAF75B: invokeCallbacksOPTION (popt.c:139)
==21534==by 0x6DB1428: poptGetNextOpt (popt.c:1515)
==21534==by 0x508F912: rpmcliInit (poptALL.c:302)
==21534==by 0x1095B2: main (rpmspec.c:63)
==21534==
1> %{?_transaction_color}^
1> %{?_prefer_color}^
1> %{_netsharedpath}^
1> %{_install_langs}^
==21534==
==21534== HEAP SUMMARY:
==21534== in use at exit: 7,183 bytes in 71 blocks
==21534== total heap usage: 7,811 allocs, 7,740 frees, 3,500,361 bytes
allocated
==21534==
==21534== LEAK SUMMARY:
==21534==definitely lost: 19 bytes in 1 blocks
==21534==indirectly lost: 0 bytes in 0 blocks
==21534== possibly lost: 0 bytes in 0 blocks
==21534==still reachable: 7,164 bytes in 70 blocks
==21534== suppressed: 0 bytes in 0 blocks
==21534== Rerun with --leak-check=full to see details of leaked memory
==21534==
==21534== For counts of detected and suppressed errors, rerun with: -v
==21534== ERROR SUMMARY: 5 errors from 1 contexts (suppressed: 0 from 0)
trillian:~$
This can easily be avoided by checking the first byte as well as the
second for our sentinal value (NUL).
Signed-off-by: Peter Jones
You can view, comment on, or merge this pull request online at:
https://github.com/rpm-software-management/rpm/pull/160
-- Commit Summary --
* Bounds check strings to print correctly in %trace mode.
-- File Changes --
M rpmio/macro.c (2)
-- Patch Links --
https://github.com/rpm-software-management/rpm/pull/160.patch
https://github.com/rpm-software-management/rpm/pull/160.diff
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