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[Qemu-devel] [RFC PATCH 0/1] linux-user: Issue running applications thro
From: |
Meador Inge |
Subject: |
[Qemu-devel] [RFC PATCH 0/1] linux-user: Issue running applications through ld.so |
Date: |
Thu, 7 Jun 2012 15:59:01 -0500 |
Hi All,
I am running into an issue where QEMU fails to map a target executable
due to hitting the lower limit on /proc/sys/vm/mmap_min_addr. This normally
just works because of all the nice guest base probing we have in place:
$ cat /proc/sys/vm/mmap_min_addr
4096
$ qemu-arm ./hello.out
Hello, World!
In cases where the executable is run through the glibc loader we are not so
lucky:
$ qemu-arm /path/to/lib/ld-2.15.so --library-path /path/to/lib/ ./hello.out
./hello.out: error while loading shared libraries: ./hello.out: failed to map
segment from shared object: Permission denied
The reason is that we successfully load the loader (since it can be put
anywhere), but later ld.so goes to map in hello.out at a fixed address
and fails because that fixed address is bellow mmap_min_addr and it is
too late to fixup the guest base.
I am able to fix the issue by probing for the guest base when needed for
shared objects. This worked for all the test cases I threw at it
(including running the gcc and glibc test suites through QEMU). However,
I am not all that familiar with the Linux usermode pieces and would like
some feedback.
Thoughts?
Meador Inge (1):
linux-user: Probe the guest base for shared objects when needed
linux-user/elfload.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
--
1.7.7.6
- [Qemu-devel] [RFC PATCH 0/1] linux-user: Issue running applications through ld.so,
Meador Inge <=
- [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Meador Inge, 2012/06/08
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Richard Henderson, 2012/06/12
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Meador Inge, 2012/06/12
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Meador Inge, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Richard Henderson, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Peter Maydell, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Andreas Färber, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Richard Henderson, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Andreas Färber, 2012/06/27
- Re: [Qemu-devel] [RFC PATCH 1/1] linux-user: Probe the guest base for shared objects when needed, Paul Brook, 2012/06/27