Subject: [nacked] kernel-sysc-reduce-required-permission-for-prctl_set_mm.patch removed from -mm tree
To: avagin@xxxxxxxxxx,adityakali@xxxxxxxxxx,ebiederm@xxxxxxxxxxxx,gang.chen@xxxxxxxxxxx,holt@xxxxxxx,keescook@xxxxxxxxxxxx,mtk.manpages@xxxxxxxxx,oleg@xxxxxxxxxx,sfr@xxxxxxxxxxxxxxxx,viro@xxxxxxxxxxxxxxxxxx,xemul@xxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 12 Feb 2014 15:24:35 -0800
The patch titled
Subject: kernel/sys.c: reduce required permission for prctl_set_mm
has been removed from the -mm tree. Its filename was
kernel-sysc-reduce-required-permission-for-prctl_set_mm.patch
This patch was dropped because it was nacked
------------------------------------------------------
From: Andrey Vagin <avagin@xxxxxxxxxx>
Subject: kernel/sys.c: reduce required permission for prctl_set_mm
Currently prctl_set_mm requires the global CAP_SYS_RESOURCE, this patch
reduce requiremence to CAP_SYS_RESOURCE in the current namespace.
When we restore a task we need to set up text, data and data heap sizes
from userspace to the values a task had at checkpoint time.
Currently we can not restore these parameters, if a task lives in a
non-root user name space, because it has no capabilities in the parent
namespace.
prctl_set_mm() changes parameters of the current task and doesn't affect
other tasks.
This patch affects the RLIMIT_DATA limit, because a consumtiuon is
calculated relatively to mm->end_data, mm->start_data, mm->start_brk.
rlim = rlimit(RLIMIT_DATA);
if (rlim < RLIM_INFINITY && (brk - mm->start_brk) +
(mm->end_data - mm->start_data) > rlim)
goto out;
This limit affects calls to brk() and sbrk(), but it doesn't affect
mmap. So I think requirement of CAP_SYS_RESOURCE in the current
namespace is enough for this limit.
Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Robin Holt <holt@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Chen Gang <gang.chen@xxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Aditya Kali <adityakali@xxxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/sys.c~kernel-sysc-reduce-required-permission-for-prctl_set_mm kernel/sys.c
--- a/kernel/sys.c~kernel-sysc-reduce-required-permission-for-prctl_set_mm
+++ a/kernel/sys.c
@@ -1701,7 +1701,7 @@ static int prctl_set_mm(int opt, unsigne
if (arg5 || (arg4 && opt != PR_SET_MM_AUXV))
return -EINVAL;
- if (!capable(CAP_SYS_RESOURCE))
+ if (!ns_capable(current_user_ns(), CAP_SYS_RESOURCE))
return -EPERM;
if (opt == PR_SET_MM_EXE_FILE)
_
Patches currently in -mm which might be from avagin@xxxxxxxxxx are
origin.patch
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