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kill syscall check uid

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This commit is contained in:
Tomoki Shirasawa
2015-03-17 15:04:36 +09:00
parent ed6d94a358
commit 8934eb91a4
9 changed files with 123 additions and 2 deletions
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3
kernel/host.c
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@@ -349,6 +349,9 @@ static int process_msg_prepare_process(unsigned long rphys)
}
proc->ftn->pid = pn->pid;
proc->ftn->pgid = pn->pgid;
proc->ftn->ruid = pn->ruid;
proc->ftn->euid = pn->euid;
proc->ftn->suid = pn->suid;
proc->vm->region.user_start = pn->user_start;
proc->vm->region.user_end = pn->user_end;
proc->vm->region.map_start = (USER_END / 3) & LARGE_PAGE_MASK;

3
kernel/include/process.h
View File

@@ -279,6 +279,9 @@ struct fork_tree_node {
int pid;
int tid;
int pgid;
int ruid;
int euid;
int suid;
struct fork_tree_node *parent;
struct list_head children;

3
kernel/include/syscall.h
View File

@@ -140,6 +140,9 @@ struct program_load_desc {
int err;
int stack_prot;
int pgid;
int ruid;
int euid;
int suid;
unsigned long entry;
unsigned long user_start;
unsigned long user_end;

4
kernel/process.c
View File

@@ -106,6 +106,10 @@ void init_fork_tree_node(struct fork_tree_node *ftn,
ftn->parent = NULL;
if (parent) {
ftn->parent = parent;
ftn->pgid = parent->pgid;
ftn->ruid = parent->ruid;
ftn->euid = parent->euid;
ftn->suid = parent->suid;
}
INIT_LIST_HEAD(&ftn->children);
INIT_LIST_HEAD(&ftn->siblings_list);

88
kernel/syscall.c
View File

@@ -104,6 +104,7 @@ int copy_to_user(void *, const void *, size_t);
int patch_process_vm(struct process_vm *, void *, const void *, size_t);
void do_setpgid(int, int);
extern long alloc_debugreg(struct process *proc);
extern int num_processors;
int prepare_process_ranges_args_envs(struct process *proc,
struct program_load_desc *pn,
@@ -1871,8 +1872,6 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
return -ENOMEM;
}
new->ftn->pgid = cpu_local_var(current)->ftn->pgid;
cpu_set(cpuid, &new->vm->cpu_set, &new->vm->cpu_set_lock);
if (clone_flags & CLONE_VM) {
@@ -2034,6 +2033,91 @@ SYSCALL_DECLARE(tgkill)
return do_kill(tgid, tid, sig, &info, 0);
}
void
do_setresuid(int ruid, int euid, int suid)
{
struct process *proc = cpu_local_var(current);
int pid = proc->ftn->pid;
struct cpu_local_var *v;
struct process *p;
int i;
unsigned long irqstate;
for(i = 0; i < num_processors; i++){
v = get_cpu_local_var(i);
irqstate = ihk_mc_spinlock_lock(&(v->runq_lock));
list_for_each_entry(p, &(v->runq), sched_list){
if(p->ftn->pid == pid){
if(ruid != -1)
p->ftn->ruid = ruid;
if(euid != -1)
p->ftn->euid = euid;
if(suid != -1)
p->ftn->suid = suid;
}
}
ihk_mc_spinlock_unlock(&(v->runq_lock), irqstate);
}
}
SYSCALL_DECLARE(setresuid)
{
int ruid = ihk_mc_syscall_arg0(ctx);
int euid = ihk_mc_syscall_arg1(ctx);
int suid = ihk_mc_syscall_arg2(ctx);
int rc;
rc = syscall_generic_forwarding(__NR_setresuid, ctx);
if(rc == 0){
do_setresuid(ruid, euid, suid);
}
return rc;
}
SYSCALL_DECLARE(setreuid)
{
int ruid = ihk_mc_syscall_arg0(ctx);
int euid = ihk_mc_syscall_arg1(ctx);
int suid = -1;
int rc;
struct process *proc = cpu_local_var(current);
// int euid_bak = proc->ftn->euid;
int ruid_bak = proc->ftn->ruid;
rc = syscall_generic_forwarding(__NR_setreuid, ctx);
if(rc == 0){
if(euid != -1){
if(euid != ruid_bak){
suid = euid;
}
}
else if(ruid != -1){
}
do_setresuid(ruid, euid, suid);
}
return rc;
}
SYSCALL_DECLARE(setuid)
{
int euid = ihk_mc_syscall_arg0(ctx);
int ruid = -1;
int suid = -1;
long rc;
struct process *proc = cpu_local_var(current);
int euid_bak = proc->ftn->euid;
rc = syscall_generic_forwarding(__NR_setuid, ctx);
if(rc == 0){
if(euid_bak == 0){
ruid = euid;
suid = euid;
}
do_setresuid(ruid, euid, suid);
}
return rc;
}
SYSCALL_DECLARE(setpgid)
{
int pid = ihk_mc_syscall_arg0(ctx);