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Date:      Fri, 23 Feb 2001 17:31:27 -0700
From:      Warner Losh <imp@harmony.village.org>
To:        arch@FreeBSD.ORG
Subject:   Re: sysctl kern.fallback_elf_brand 
Message-ID:  <200102240031.f1O0VRW84469@harmony.village.org>
In-Reply-To: Your message of "Fri, 23 Feb 2001 16:23:42 PST." <20010223162342.E72750@dragon.nuxi.com> 
References:  <20010223162342.E72750@dragon.nuxi.com>  <20010223121449.B68586@dragon.nuxi.com> <20010223043149.C2539@dragon.nuxi.com> <20010222233800.A1394@mollari.cthul.hu> <3A960EF8.75C3FC53@cup.hp.com> <20010222233800.A1394@mollari.cthul.hu> <200102230812.f1N8CVW79145@harmony.village.org> <20010223043149.C2539@dragon.nuxi.com> <200102231720.f1NHKXN00386@billy-club.village.org> <20010223121449.B68586@dragon.nuxi.com> <200102232026.f1NKQaW82988@harmony.village.org> 

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In message <20010223162342.E72750@dragon.nuxi.com> "David O'Brien" writes:
: > Translated into a useful answer:
: > 	The old brand byte of 0 won't cause problems because the old
: > 	branding is different than the linux binaries causing
: > 	problems.
: 
: I can't even understand that translation.

OK, the following is better:
	"The old way of branding the binaries write FreeBSD into an
	unused part of the header and set e_ident to 0.  4.0 did this.
	However, that won't cause problems because the problementic
	Linux binaries have e_ident set to 0, but no FreeBSD in
	that unused part of the header.  This menas that it is safe to
	MFC."

: The difference you noted was that old 4.0 binaries did not set the
: e_ident ELF header field to anything.  If I removed (1) above as I
: should, you would also have seen that difference of course.

Right.  I was confused.  It happens sometimes.  I litterally had found
the difference earlier in the day and jumped to the wrong conclusion.

Warner

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