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syscall: add prlimit64

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Change-Id: Iad882813d54b439c236c0df74dc81508190e6707
This commit is contained in:
Masamichi Takagi
2020-07-17 13:49:36 +09:00
parent b3d7bbda56
commit a20e1acf01
5 changed files with 149 additions and 48 deletions
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183
kernel/syscall.c
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@ -6596,71 +6596,162 @@ static int rlimits[] = {
#endif
};
SYSCALL_DECLARE(setrlimit)
static int do_prlimit64(int pid, int resource, struct rlimit *_new_limit,
struct rlimit *old_limit)
{
int rc;
int resource = ihk_mc_syscall_arg0(ctx);
struct rlimit *rlm = (struct rlimit *)ihk_mc_syscall_arg1(ctx);
struct thread *thread = cpu_local_var(current);
int i;
struct rlimit new_rlim;
int mcresource;
struct rlimit new_limit;
int resource_found;
int i;
int mcresource;
struct process *proc;
struct resource_set *rset = cpu_local_var(resource_set);
int hash;
struct process_hash *phash = rset->process_hash;
struct mcs_rwlock_node exist_lock;
struct mcs_rwlock_node update_lock;
unsigned long irqstate;
int found;
int ret;
ihk_mc_user_context_t ctx;
if (copy_from_user(&new_rlim, rlm, sizeof(*rlm))) {
return -EFAULT;
}
if (new_rlim.rlim_cur > new_rlim.rlim_max) {
if (resource < 0 || resource >= RLIMIT_NLIMITS) {
return -EINVAL;
}
switch(resource){
case RLIMIT_FSIZE:
case RLIMIT_NOFILE:
case RLIMIT_LOCKS:
case RLIMIT_MSGQUEUE:
rc = syscall_generic_forwarding(__NR_setrlimit, ctx);
if(rc < 0)
return rc;
break;
}
if (_new_limit) {
if (copy_from_user(&new_limit, _new_limit,
sizeof(struct rlimit))) {
return -EFAULT;
}
for(i = 0; i < sizeof(rlimits) / sizeof(int); i += 2)
if(rlimits[i] == resource){
mcresource = rlimits[i + 1];
if (new_limit.rlim_cur > new_limit.rlim_max) {
return -EINVAL;
}
/* update Linux side value as well */
switch (resource) {
case RLIMIT_FSIZE:
case RLIMIT_NOFILE:
case RLIMIT_LOCKS:
case RLIMIT_MSGQUEUE:
ihk_mc_syscall_arg0(&ctx) = pid;
ihk_mc_syscall_arg1(&ctx) = resource;
ihk_mc_syscall_arg2(&ctx) =
(unsigned long)_new_limit;
ihk_mc_syscall_arg3(&ctx) =
(unsigned long)old_limit;
ret = syscall_generic_forwarding(__NR_prlimit64, &ctx);
if (ret < 0)
return ret;
break;
}
if(i >= sizeof(rlimits) / sizeof(int)){
return syscall_generic_forwarding(__NR_setrlimit, ctx);
}
memcpy(thread->proc->rlimit + mcresource, &new_rlim,
sizeof(new_rlim));
/* translate resource */
resource_found = 0;
for (i = 0; i < sizeof(rlimits) / sizeof(int); i += 2) {
if (rlimits[i] == resource) {
mcresource = rlimits[i + 1];
resource_found = 1;
break;
}
}
return 0;
if (!resource_found) {
ihk_mc_syscall_arg0(&ctx) = pid;
ihk_mc_syscall_arg1(&ctx) = resource;
ihk_mc_syscall_arg2(&ctx) =
(unsigned long)_new_limit;
ihk_mc_syscall_arg3(&ctx) =
(unsigned long)old_limit;
return syscall_generic_forwarding(__NR_prlimit64, &ctx);
}
/* find process */
found = 0;
if (pid == 0) {
struct thread *thread = cpu_local_var(current);
pid = thread->proc->pid;
}
irqstate = cpu_disable_interrupt_save();
hash = process_hash(pid);
mcs_rwlock_reader_lock_noirq(&phash->lock[hash], &exist_lock);
list_for_each_entry(proc, &phash->list[hash], hash_list) {
if (proc->pid == pid) {
found = 1;
break;
}
}
if (!found) {
mcs_rwlock_reader_unlock_noirq(&phash->lock[hash], &exist_lock);
cpu_restore_interrupt(irqstate);
return -ESRCH;
}
if (_new_limit) {
mcs_rwlock_writer_lock_noirq(&proc->update_lock, &update_lock);
} else {
mcs_rwlock_reader_lock_noirq(&proc->update_lock, &update_lock);
}
if (old_limit) {
if (copy_to_user(old_limit, proc->rlimit + mcresource,
sizeof(struct rlimit))) {
ret = -EFAULT;
goto out;
}
}
if (_new_limit) {
memcpy(proc->rlimit + mcresource, &new_limit,
sizeof(struct rlimit));
}
ret = 0;
out:
if (_new_limit) {
mcs_rwlock_writer_unlock_noirq(&proc->update_lock,
&update_lock);
} else {
mcs_rwlock_reader_unlock_noirq(&proc->update_lock,
&update_lock);
}
mcs_rwlock_reader_unlock_noirq(&phash->lock[hash], &exist_lock);
cpu_restore_interrupt(irqstate);
return ret;
}
SYSCALL_DECLARE(setrlimit)
{
int resource = ihk_mc_syscall_arg0(ctx);
struct rlimit *new_limit = (struct rlimit *)ihk_mc_syscall_arg1(ctx);
return do_prlimit64(0, resource, new_limit, NULL);
}
SYSCALL_DECLARE(getrlimit)
{
int resource = ihk_mc_syscall_arg0(ctx);
struct rlimit *rlm = (struct rlimit *)ihk_mc_syscall_arg1(ctx);
struct thread *thread = cpu_local_var(current);
int i;
int mcresource;
struct rlimit *old_limit = (struct rlimit *)ihk_mc_syscall_arg1(ctx);
for(i = 0; i < sizeof(rlimits) / sizeof(int); i += 2)
if(rlimits[i] == resource){
mcresource = rlimits[i + 1];
break;
}
if(i >= sizeof(rlimits) / sizeof(int)){
return syscall_generic_forwarding(__NR_getrlimit, ctx);
}
return do_prlimit64(0, resource, NULL, old_limit);
}
// TODO: check limit
if(copy_to_user(rlm, thread->proc->rlimit + mcresource, sizeof(struct rlimit)))
return -EFAULT;
SYSCALL_DECLARE(prlimit64)
{
int pid = ihk_mc_syscall_arg0(ctx);
int resource = ihk_mc_syscall_arg1(ctx);
struct rlimit *new_limit = (struct rlimit *)ihk_mc_syscall_arg2(ctx);
struct rlimit *old_limit = (struct rlimit *)ihk_mc_syscall_arg3(ctx);
return 0;
return do_prlimit64(pid, resource, new_limit, old_limit);
}
SYSCALL_DECLARE(getrusage)