asmlinkage long sys_getsid(pid_t pid) { if (!pid) return task_session_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_getsid(p); if (!retval) retval = task_session_nr_ns(p, ns); } read_unlock(&tasklist_lock); return retval; } }
/* 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; }