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[Qemu-devel] [5266] Fix getgroups() with zero size parameter (Kirill Shu
From: |
Andrzej Zaborowski |
Subject: |
[Qemu-devel] [5266] Fix getgroups() with zero size parameter (Kirill Shutemov). |
Date: |
Sat, 20 Sep 2008 02:08:14 +0000 |
Revision: 5266
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5266
Author: balrog
Date: 2008-09-20 02:08:13 +0000 (Sat, 20 Sep 2008)
Log Message:
-----------
Fix getgroups() with zero size parameter (Kirill Shutemov).
According to man page getgroups(2):
If size is zero, list is not modified, but the total number of
supplementary group IDs for the process is returned.
Signed-off-by: Kirill A. Shutemov <address@hidden>
Modified Paths:
--------------
trunk/linux-user/syscall.c
Modified: trunk/linux-user/syscall.c
===================================================================
--- trunk/linux-user/syscall.c 2008-09-20 01:32:07 UTC (rev 5265)
+++ trunk/linux-user/syscall.c 2008-09-20 02:08:13 UTC (rev 5266)
@@ -5247,6 +5247,8 @@
grouplist = alloca(gidsetsize * sizeof(gid_t));
ret = get_errno(getgroups(gidsetsize, grouplist));
+ if (gidsetsize == 0)
+ break;
if (!is_error(ret)) {
target_grouplist = lock_user(VERIFY_WRITE, arg2, gidsetsize *
2, 0);
if (!target_grouplist)
@@ -5397,6 +5399,8 @@
grouplist = alloca(gidsetsize * sizeof(gid_t));
ret = get_errno(getgroups(gidsetsize, grouplist));
+ if (gidsetsize == 0)
+ break;
if (!is_error(ret)) {
target_grouplist = lock_user(VERIFY_WRITE, arg2, gidsetsize *
4, 0);
if (!target_grouplist) {
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