From cb3bc23361830872663395de112c2c76ff00be50 Mon Sep 17 00:00:00 2001 From: balrog Date: Sat, 20 Sep 2008 02:08:13 +0000 Subject: 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 git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5266 c046a42c-6fe2-441c-8c8c-71466251a162 --- linux-user/syscall.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 56b413857e..4ba8880261 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -5247,6 +5247,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 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 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, 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) { -- cgit v1.2.3