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From: Thomas Dickey <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: libc6: memcpy is ignoring the size-parameter
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Package: libc6
Version: 2.3.2.ds1-18
Severity: important
Checking for memory leaks (in vile) with valgrind,
I got some unexplainable errors, such as this:
==15339== Invalid write of size 1
==15339== at 0x1B904B5C: memcpy (mac_replace_strmem.c:301)
==15339== by 0x80ACDA2: doalloc (trace.c:498)
==15339== by 0x8088283: extend_mode_list (modes.c:3096)
==15339== by 0x8089377: do_a_submode (modes.c:3471)
==15339== by 0x80894A4: define_submode (modes.c:3499)
==15339== by 0x80689D3: call_cmdfunc (exec.c:815)
==15339== by 0x8068C28: execute (exec.c:914)
==15339== by 0x806895E: docmd (exec.c:797)
==15339== by 0x806B11A: perform_dobuf (exec.c:2306)
==15339== by 0x806B338: dobuf (exec.c:2386)
==15339== Address 0x1BAEC8AB is 3 bytes after a block of size 2968 alloc'd
==15339== at 0x1B905901: calloc (vg_replace_malloc.c:176)
==15339== by 0x80ACCE8: doalloc (trace.c:492)
==15339== by 0x8088283: extend_mode_list (modes.c:3096)
==15339== by 0x8089377: do_a_submode (modes.c:3471)
==15339== by 0x80894A4: define_submode (modes.c:3499)
==15339== by 0x80689D3: call_cmdfunc (exec.c:815)
==15339== by 0x8068C28: execute (exec.c:914)
==15339== by 0x806895E: docmd (exec.c:797)
==15339== by 0x806B11A: perform_dobuf (exec.c:2306)
==15339== by 0x806B338: dobuf (exec.c:2386)
The "doalloc" wrapper in this case is calling memcpy to appease valgrind's
complaints about copying uninitialized data with a realloc (replaced by a
calloc and memcpy). After checking the various limits and sizes, I finally
replaced the memcpy() call with a for-loop using the same variables:
for (k = 0; k < area[j].size; ++k)
newp[k] = oldp[k];
//memcpy(newp, oldp, area[j].size);
and the warnings went away.
My guess is that some change to memcpy modified its logic to copy words
(or larger chunks) rather than bytes has been broken.
Alternatively, valgrind is broken (it's hard to tell).
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.4.27-td2
Locale: LANG=C, LC_CTYPE=C
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
-- no debconf information
---------------------------------------
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Date: Mon, 28 Feb 2005 10:17:29 +0900
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From: GOTO Masanori <[EMAIL PROTECTED]>
To: Lars Wirzenius <[EMAIL PROTECTED]>, Thomas Dickey <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
Subject: Re: Bug#278426: libc6: memcpy problem is gone, close bug?
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At Thu, 17 Feb 2005 03:22:34 +0200,
Lars Wirzenius wrote:
> I couldn't reproduce this either, using a trivial test case, and the
> submitter says he can't either. Could this bug be closed?
I didn't notice Thomas' reply - because it sent to -submitter address.
Lars, nice follow up!
Thomas, Lars, thanks for your notification and confirmation. I close
this report now.
Regards,
-- gotom
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