diff options
| author | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-09-20 02:08:13 +0000 |
|---|---|---|
| committer | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-09-20 02:08:13 +0000 |
| commit | cb3bc23361830872663395de112c2c76ff00be50 (patch) | |
| tree | e2bc1362b82807cd7ae10939bd6c51e4366d99f9 | |
| parent | e856f2ad014e6cb1bd3eca126be23b8f919f3dd1 (diff) | |
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 <kirill@shutemov.name>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5266 c046a42c-6fe2-441c-8c8c-71466251a162
| -rw-r--r-- | linux-user/syscall.c | 4 |
1 files changed, 4 insertions, 0 deletions
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) { |