asmlinkage long sys_getpgid(pid_t pid)
{
if (!pid)
return task_pgrp_vnr(current);
else {
int retval;
struct task_struct *p;
struct pid_namespace *ns;
ns = current->nsproxy->pid_ns;
read_lock(&tasklist_lock);
p = find_task_by_pid_ns(pid, ns);
retval = -ESRCH;
if (p) {
retval = security_task_getpgid(p);
if (!retval)
retval = task_pgrp_nr_ns(p, ns);
}
read_unlock(&tasklist_lock);
return retval;
}
}
asmlinkage long sys_setsid(void)
{
struct task_struct *group_leader = current->group_leader;
pid_t session;
int err = -EPERM;
write_lock_irq(&tasklist_lock);
/* Fail if I am already a session leader */
if (group_leader->signal->leader)
goto out;
session = group_leader->pid;
/* Fail if a process group id already exists that equals the
* proposed session id.
*
* Don't check if session id == 1 because kernel threads use this
* session id and so the check will always fail and make it so
* init cannot successfully call setsid.
*/
if (session > 1 && find_task_by_pid_type_ns(PIDTYPE_PGID,
session, &init_pid_ns))
goto out;
group_leader->signal->leader = 1;
__set_special_pids(session, session);
spin_lock(&group_leader->sighand->siglock);
group_leader->signal->tty = NULL;
spin_unlock(&group_leader->sighand->siglock);
err = task_pgrp_vnr(group_leader);
out:
write_unlock_irq(&tasklist_lock);
return err;
}
/* Actual dumper.
*
* This is a two-pass process; first we find the offsets of the bits,
* and then they are actually written out. If we run out of core limit
* we just truncate.
*/
static int irix_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
{
int has_dumped = 0;
mm_segment_t fs;
int segs;
int i;
size_t size;
struct vm_area_struct *vma;
struct elfhdr elf;
off_t offset = 0, dataoff;
int numnote = 3;
struct memelfnote notes[3];
struct elf_prstatus prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct elf_prpsinfo psinfo; /* NT_PRPSINFO */
/* Count what's needed to dump, up to the limit of coredump size. */
segs = 0;
size = 0;
for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
if (maydump(vma))
{
int sz = vma->vm_end-vma->vm_start;
if (size+sz >= limit)
break;
else
size += sz;
}
segs++;
}
pr_debug("irix_core_dump: %d segs taking %d bytes\n", segs, size);
/* Set up header. */
memcpy(elf.e_ident, ELFMAG, SELFMAG);
elf.e_ident[EI_CLASS] = ELFCLASS32;
elf.e_ident[EI_DATA] = ELFDATA2LSB;
elf.e_ident[EI_VERSION] = EV_CURRENT;
elf.e_ident[EI_OSABI] = ELF_OSABI;
memset(elf.e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
elf.e_type = ET_CORE;
elf.e_machine = ELF_ARCH;
elf.e_version = EV_CURRENT;
elf.e_entry = 0;
elf.e_phoff = sizeof(elf);
elf.e_shoff = 0;
elf.e_flags = 0;
elf.e_ehsize = sizeof(elf);
elf.e_phentsize = sizeof(struct elf_phdr);
elf.e_phnum = segs+1; /* Include notes. */
elf.e_shentsize = 0;
elf.e_shnum = 0;
elf.e_shstrndx = 0;
fs = get_fs();
set_fs(KERNEL_DS);
has_dumped = 1;
current->flags |= PF_DUMPCORE;
DUMP_WRITE(&elf, sizeof(elf));
offset += sizeof(elf); /* Elf header. */
offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers. */
/* Set up the notes in similar form to SVR4 core dumps made
* with info from their /proc.
*/
memset(&psinfo, 0, sizeof(psinfo));
memset(&prstatus, 0, sizeof(prstatus));
notes[0].name = "CORE";
notes[0].type = NT_PRSTATUS;
notes[0].datasz = sizeof(prstatus);
notes[0].data = &prstatus;
prstatus.pr_info.si_signo = prstatus.pr_cursig = signr;
prstatus.pr_sigpend = current->pending.signal.sig[0];
prstatus.pr_sighold = current->blocked.sig[0];
psinfo.pr_pid = prstatus.pr_pid = task_pid_vnr(current);
psinfo.pr_ppid = prstatus.pr_ppid = task_pid_vnr(current->parent);
psinfo.pr_pgrp = prstatus.pr_pgrp = task_pgrp_vnr(current);
psinfo.pr_sid = prstatus.pr_sid = task_session_vnr(current);
if (thread_group_leader(current)) {
/*
* This is the record for the group leader. Add in the
* cumulative times of previous dead threads. This total
* won't include the time of each live thread whose state
* is included in the core dump. The final total reported
* to our parent process when it calls wait4 will include
* those sums as well as the little bit more time it takes
* this and each other thread to finish dying after the
* core dump synchronization phase.
*/
jiffies_to_timeval(current->utime + current->signal->utime,
&prstatus.pr_utime);
jiffies_to_timeval(current->stime + current->signal->stime,
&prstatus.pr_stime);
} else {
jiffies_to_timeval(current->utime, &prstatus.pr_utime);
jiffies_to_timeval(current->stime, &prstatus.pr_stime);
}
jiffies_to_timeval(current->signal->cutime, &prstatus.pr_cutime);
jiffies_to_timeval(current->signal->cstime, &prstatus.pr_cstime);
if (sizeof(elf_gregset_t) != sizeof(struct pt_regs)) {
printk("sizeof(elf_gregset_t) (%d) != sizeof(struct pt_regs) "
"(%d)\n", sizeof(elf_gregset_t), sizeof(struct pt_regs));
} else {
*(struct pt_regs *)&prstatus.pr_reg = *regs;
}
notes[1].name = "CORE";
notes[1].type = NT_PRPSINFO;
notes[1].datasz = sizeof(psinfo);
notes[1].data = &psinfo;
i = current->state ? ffz(~current->state) + 1 : 0;
psinfo.pr_state = i;
psinfo.pr_sname = (i < 0 || i > 5) ? '.' : "RSDZTD"[i];
psinfo.pr_zomb = psinfo.pr_sname == 'Z';
psinfo.pr_nice = task_nice(current);
psinfo.pr_flag = current->flags;
psinfo.pr_uid = current->uid;
psinfo.pr_gid = current->gid;
{
int i, len;
set_fs(fs);
len = current->mm->arg_end - current->mm->arg_start;
len = len >= ELF_PRARGSZ ? ELF_PRARGSZ : len;
(void *) copy_from_user(&psinfo.pr_psargs,
(const char __user *)current->mm->arg_start, len);
for (i = 0; i < len; i++)
if (psinfo.pr_psargs[i] == 0)
psinfo.pr_psargs[i] = ' ';
psinfo.pr_psargs[len] = 0;
set_fs(KERNEL_DS);
}
strlcpy(psinfo.pr_fname, current->comm, sizeof(psinfo.pr_fname));
/* Try to dump the FPU. */
prstatus.pr_fpvalid = dump_fpu(regs, &fpu);
if (!prstatus.pr_fpvalid) {
numnote--;
} else {
notes[2].name = "CORE";
notes[2].type = NT_PRFPREG;
notes[2].datasz = sizeof(fpu);
notes[2].data = &fpu;
}
/* Write notes phdr entry. */
{
struct elf_phdr phdr;
int sz = 0;
for (i = 0; i < numnote; i++)
sz += notesize(¬es[i]);
phdr.p_type = PT_NOTE;
phdr.p_offset = offset;
phdr.p_vaddr = 0;
phdr.p_paddr = 0;
phdr.p_filesz = sz;
phdr.p_memsz = 0;
phdr.p_flags = 0;
phdr.p_align = 0;
offset += phdr.p_filesz;
DUMP_WRITE(&phdr, sizeof(phdr));
}
/* Page-align dumped data. */
dataoff = offset = roundup(offset, PAGE_SIZE);
/* Write program headers for segments dump. */
for (vma = current->mm->mmap, i = 0;
i < segs && vma != NULL; vma = vma->vm_next) {
struct elf_phdr phdr;
size_t sz;
i++;
sz = vma->vm_end - vma->vm_start;
phdr.p_type = PT_LOAD;
phdr.p_offset = offset;
phdr.p_vaddr = vma->vm_start;
phdr.p_paddr = 0;
phdr.p_filesz = maydump(vma) ? sz : 0;
phdr.p_memsz = sz;
offset += phdr.p_filesz;
phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
if (vma->vm_flags & VM_WRITE)
phdr.p_flags |= PF_W;
if (vma->vm_flags & VM_EXEC)
phdr.p_flags |= PF_X;
phdr.p_align = PAGE_SIZE;
DUMP_WRITE(&phdr, sizeof(phdr));
}
for (i = 0; i < numnote; i++)
if (!writenote(¬es[i], file))
goto end_coredump;
set_fs(fs);
DUMP_SEEK(dataoff);
for (i = 0, vma = current->mm->mmap;
i < segs && vma != NULL;
vma = vma->vm_next) {
unsigned long addr = vma->vm_start;
unsigned long len = vma->vm_end - vma->vm_start;
if (!maydump(vma))
continue;
i++;
pr_debug("elf_core_dump: writing %08lx %lx\n", addr, len);
DUMP_WRITE((void __user *)addr, len);
}
if ((off_t) file->f_pos != offset) {
/* Sanity check. */
printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
(off_t) file->f_pos, offset);
}
end_coredump:
set_fs(fs);
return has_dumped;
}
asmlinkage long sys_getpgrp(void)
{
/* SMP - assuming writes are word atomic this is fine */
return task_pgrp_vnr(current);
}
