Date: Sat, 26 Oct 2019 10:27:36 -0700 From: Cy Schubert <Cy.Schubert@cschubert.com> To: Cy Schubert <Cy.Schubert@cschubert.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Message-ID: <201910261727.x9QHRaKE001070@slippy.cwsent.com> In-Reply-To: <201910261722.x9QHMuK1000981@slippy.cwsent.com> References: <201910261722.x9QHMuK1000981@slippy.cwsent.com>
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I'll repost, this time with a subject line. Don't reply to this. Sorry for the SPAM. -- Cheers, Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org The need of the many outweighs the greed of the few. In message <201910261722.x9QHMuK1000981@slippy.cwsent.com>, Cy Schubert writes: > Hi, > > The following little test case segfaults when aslr is enabled: > > #include <stdio.h> > #include <sys/types.h> > #include <sys/time.h> > #include <sys/resource.h> > > int > main(int argc, char *argv[]) > { > struct rlimit rl; > int rc; > > rl.rlim_cur = 50 * 4096; > rl.rlim_max = 50 * 4096; > rc = setrlimit(RLIMIT_STACK, &rl); > > return(rc); > } > > > slippy# sysctl kern.elf64.aslr.enable=1 > kern.elf64.aslr.enable: 0 -> 1 > slippy# ./test > Segmentation fault (core dumped) > slippy# gdb test > GNU gdb (GDB) 8.3.1 [GDB v8.3.1 for FreeBSD] > Copyright (C) 2019 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html > > > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. > Type "show copying" and "show warranty" for details. > This GDB was configured as "x86_64-portbld-freebsd13.0". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > <http://www.gnu.org/software/gdb/bugs/>. > Find the GDB manual and other documentation resources online at: > <http://www.gnu.org/software/gdb/documentation/>. > > For help, type "help". > Type "apropos word" to search for commands related to "word"... > Reading symbols from test... > (gdb) run > Starting program: /export/home/cy/freebsd/tests/setrlimit/test > > Program received signal SIGSEGV, Segmentation fault. > setrlimit () at setrlimit.S:4 > 4 setrlimit.S: No such file or directory. > (gdb) bt > #0 setrlimit () at setrlimit.S:4 > Backtrace stopped: Cannot access memory at address 0x7fffffe372e8 > (gdb) > > > It only occurs with aslr enabled and stack gap != 0. This isn't right. > > > -- > Cheers, > Cy Schubert <Cy.Schubert@cschubert.com> > FreeBSD UNIX: <cy@FreeBSD.org> Web: http://www.FreeBSD.org > > The need of the many outweighs the greed of the few. > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
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