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Bug 9313 - valloc() is broken in glibc-2.1.3: returns are not aligned
Summary: valloc() is broken in glibc-2.1.3: returns are not aligned
Status: CLOSED RAWHIDE
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: glibc (Show other bugs)
(Show other bugs)
Version: 6.2
Hardware: i386 Linux
medium
high
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Assignee: Cristian Gafton
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TreeView+ depends on / blocked
 
Reported: 2000-02-10 17:51 UTC by Stephen Tweedie
Modified: 2008-05-01 15:37 UTC (History)
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Doc Type: Bug Fix
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regression test for valloc() in glibc. (299 bytes, text/plain)
2000-02-10 17:52 UTC, Stephen Tweedie 		no flags Details
Add an attachment (proposed patch, testcase, etc.)

Description Stephen Tweedie 2000-02-10 17:51:08 UTC 
valloc() is a variant of malloc() intended to return page-aligned
memory areas.  It is relied on by certain programs for mmap() alignment
or for raw IO, in which cases the kernel enforces page alignment on the
user's buffers.

RH6.1 valloc() correctly aligns its return addresses.  This is no longer
true in RH6.2 beta, and code may break because of this.  In particular,
lmdd running on raw devices is now broken in 6.2 due to this problem.

I'll attach a trivial test program demonstrating the bug.
Comment 1 Stephen Tweedie 2000-02-10 17:52:59 UTC 
Created attachment 110 [details]
regression test for valloc() in glibc.
Comment 2 Stephen Tweedie 2000-02-23 17:11:59 UTC 
Confirmed fixed in glibc-2.1.3-10.
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