Date: Sun, 24 May 2020 12:42:22 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Paul FLOYD <pjfloyd@wanadoo.fr> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: SIGBUS si_code 12 Message-ID: <20200524094222.GQ64045@kib.kiev.ua> In-Reply-To: <816299859.1977.1590312280071.JavaMail.www@wwinf1c21> References: <490544208.11847.1589489181927.JavaMail.www@wwinf1n11> <20200514224347.GB46537@kib.kiev.ua> <9840EA0E-CF11-4332-A5A0-A3CDBA0F0464@wanadoo.fr> <20200521154621.GB85681@raichu> <068F2B99-24C2-4F38-ACC1-02273C198434@wanadoo.fr> <679A6BE4-E344-49D0-B76D-DB65A41E26FA@wanadoo.fr> <20200522192804.GL64045@kib.kiev.ua> <D22F2087-4FB3-4EB5-841E-61C809DF94F0@wanadoo.fr> <20200522201251.GM64045@kib.kiev.ua> <816299859.1977.1590312280071.JavaMail.www@wwinf1c21>
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On Sun, May 24, 2020 at 11:24:40AM +0200, Paul FLOYD wrote: > > > > > > And which files/functions do that? > > ELF image activator. > > > Look in kern/imgact_elf.c. It is basically in check_note, used from > > get_brandinfo. The real function names are mangled for co-existence > > of 32 and 64 bit elf activators. > > That's quite interesting. If I run procstat -b on a running Valgrind instance I see > > > aulf> procstat -b 2072 > PID COMM OSREL PATH > 2072 memcheck-amd64-free 0 /usr/home/paulf/scratch/valgrind/memcheck/memcheck-amd64-freebsd > > A quick recap of Valgrind execution > > 'valgrind' itself is just a small stub executable that looks at the guest executable to determine if it is amd64 or x86. It will then do an execve of the required tool e.g., memcheck-amd64-freebsd. > The tools themselves are entirely standalone and do not link with any libraries, not even libc. > > Is there a way to get the linker to add a .note section with osrel? Look at lib/csu/common/crtbrand.c > > If not, is there a way to set osrel after a process has started? sysctl kern.proc.KERN_PROC_OSREL.<pid>
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