Date: Mon, 14 May 2007 22:40:04 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/amd64/linux32 linux32_sysvec.c src/sys/compat/ia32 ia32_sysvec.c src/sys/kern imgact_elf.c kern_exec.c kern_resource.c src/sys/sys sysent.h Message-ID: <200705142240.l4EMe5aP047194@repoman.freebsd.org>
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jhb 2007-05-14 22:40:04 UTC
FreeBSD src repository
Modified files:
sys/amd64/linux32 linux32_sysvec.c
sys/compat/ia32 ia32_sysvec.c
sys/kern imgact_elf.c kern_exec.c kern_resource.c
sys/sys sysent.h
Log:
Rework the support for ABIs to override resource limits (used by 32-bit
processes under 64-bit kernels). Previously, each 32-bit process overwrote
its resource limits at exec() time. The problem with this approach is that
the new limits affect all child processes of the 32-bit process, including
if the child process forks and execs a 64-bit process. To fix this, don't
ovewrite the resource limits during exec(). Instead, sv_fixlimits() is
now replaced with a different function sv_fixlimit() which asks the ABI to
sanitize a single resource limit. We then use this when querying and
setting resource limits. Thus, if a 32-bit process sets a limit, then
that new limit will be inherited by future children. However, if the
32-bit process doesn't change a limit, then a future 64-bit child will
see the "full" 64-bit limit rather than the 32-bit limit.
MFC is tentative since it will break the ABI of old linux.ko modules (no
other modules are affected).
MFC after: 1 week
Revision Changes Path
1.29 +28 -34 src/sys/amd64/linux32/linux32_sysvec.c
1.24 +28 -30 src/sys/compat/ia32/ia32_sysvec.c
1.178 +1 -1 src/sys/kern/imgact_elf.c
1.303 +0 -9 src/sys/kern/kern_exec.c
1.170 +4 -6 src/sys/kern/kern_resource.c
1.54 +2 -2 src/sys/sys/sysent.h
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