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[Qemu-devel] [PATCH] Fix "Argument list to long" errors


From: Stefan Brüns
Subject: [Qemu-devel] [PATCH] Fix "Argument list to long" errors
Date: Sat, 15 Aug 2015 20:26:00 +0200

Build environments often invoke commands with huge argument lists.
For native builds, the limit on current linux (>2.6.33) is 1/4th
of the stack size, typically 2MByte, so this works fine.

For chroots with qemu emulation, the limit currently is set by
MAX_ARG_PAGES, i.e. 32*4kByte.

Without the patch, the following fails:
/usr/bin/qemu-arm -L /var/tmp/build-root/ARM-armv6l/ 
/var/tmp/build-root/ARM-armv6l/usr/bin/echo `seq 1 314360` | md5sum
/usr/bin/echo: Argument list too long

With the patch, the output matches the native invocation, argument size is
only limited by host stack size.

See also:
https://bugs.launchpad.net/ubuntu/+source/qemu-linaro/+bug/1036645
https://sourceware.org/bugzilla/show_bug.cgi?id=17169
https://lists.gnu.org/archive/html/bug-binutils/2014-07/msg00096.html


Stefan Brüns (1):
  linux-user: remove MAX_ARG_PAGES, allow dynamic growth of env/argv
    space

 linux-user/elfload.c   | 29 ++++++++++++++++++-----------
 linux-user/linuxload.c |  7 ++++---
 linux-user/qemu.h      | 11 ++---------
 linux-user/syscall.c   |  4 ++++
 4 files changed, 28 insertions(+), 23 deletions(-)

-- 
2.1.4




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