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Date: Sun, 5 Dec 2010 20:52:46 +0000 (UTC)
From: Bhadrinath <bitstrat@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Interesting behavior with struct initiailization
There was a specific concern in the previous posts.
"Even if the memset is not removed, a compiler could implement 'x.b = 2' by
-setting the low byte of a 32-bit register to 2, leaving the high bytes unchanged
-storing all 32 bits of the register into memory which would store
nonzero data in the high bytes, possibly containing sensitive information. "
In this case,even after doing a memset the compiler could copy some sensitive
information from the 32 bit register into the padding bytes.
So, I feel it is necessary to implement it by copying it to a new equivalent
struct.
Regards
Bhadrinath
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