Commit d2f58168 authored by Al Viro's avatar Al Viro

[elf-fdpic] use elf_dump_thread_status() for the dumper thread as well

the only reason to have it open-coded for the first (dumper) thread is
that coredump has a couple of process-wide notes stuck right after the
first (NT_PRSTATUS) note of the first thread.  But we don't need to
make the data collection side irregular for the first thread to handle
that - it's only the logics ordering the calls of writenote() that
needs to take care of that.
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 38a62779
...@@ -1482,7 +1482,8 @@ static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_ ...@@ -1482,7 +1482,8 @@ static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_
t->num_notes++; t->num_notes++;
*sz += notesize(&t->notes[0]); *sz += notesize(&t->notes[0]);
t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, task_pt_regs(p),
&t->fpu);
if (t->prstatus.pr_fpvalid) { if (t->prstatus.pr_fpvalid) {
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
&t->fpu); &t->fpu);
...@@ -1568,19 +1569,15 @@ static size_t elf_core_vma_data_size(unsigned long mm_flags) ...@@ -1568,19 +1569,15 @@ static size_t elf_core_vma_data_size(unsigned long mm_flags)
*/ */
static int elf_fdpic_core_dump(struct coredump_params *cprm) static int elf_fdpic_core_dump(struct coredump_params *cprm)
{ {
#define NUM_NOTES 6
int has_dumped = 0; int has_dumped = 0;
int segs; int segs;
int i; int i;
struct vm_area_struct *vma; struct vm_area_struct *vma;
struct elfhdr *elf = NULL; struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff; loff_t offset = 0, dataoff;
int numnote; struct memelfnote psinfo_note, auxv_note;
struct memelfnote *notes = NULL;
struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
struct elf_thread_status *thread_list = NULL; struct elf_thread_status *thread_list = NULL;
elf_fpregset_t *fpu = NULL;
int thread_status_size = 0; int thread_status_size = 0;
elf_addr_t *auxv; elf_addr_t *auxv;
struct elf_phdr *phdr4note = NULL; struct elf_phdr *phdr4note = NULL;
...@@ -1606,19 +1603,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) ...@@ -1606,19 +1603,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
elf = kmalloc(sizeof(*elf), GFP_KERNEL); elf = kmalloc(sizeof(*elf), GFP_KERNEL);
if (!elf) if (!elf)
goto end_coredump; goto end_coredump;
prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
if (!prstatus)
goto end_coredump;
psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
if (!psinfo) if (!psinfo)
goto end_coredump; goto end_coredump;
notes = kmalloc_array(NUM_NOTES, sizeof(struct memelfnote),
GFP_KERNEL);
if (!notes)
goto end_coredump;
fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
if (!fpu)
goto end_coredump;
for (ct = current->mm->core_state->dumper.next; for (ct = current->mm->core_state->dumper.next;
ct; ct = ct->next) { ct; ct = ct->next) {
...@@ -1632,8 +1619,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) ...@@ -1632,8 +1619,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
} }
/* now collect the dump for the current */ /* now collect the dump for the current */
fill_prstatus(prstatus, current, cprm->siginfo->si_signo); tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); current, &thread_status_size);
if (!tmp)
goto end_coredump;
tmp->next = thread_list;
thread_list = tmp;
segs = current->mm->map_count; segs = current->mm->map_count;
segs += elf_core_extra_phdrs(); segs += elf_core_extra_phdrs();
...@@ -1655,46 +1646,28 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) ...@@ -1655,46 +1646,28 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
* with info from their /proc. * with info from their /proc.
*/ */
fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
fill_psinfo(psinfo, current->group_leader, current->mm); fill_psinfo(psinfo, current->group_leader, current->mm);
fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
thread_status_size += notesize(&psinfo_note);
numnote = 2;
auxv = (elf_addr_t *) current->mm->saved_auxv; auxv = (elf_addr_t *) current->mm->saved_auxv;
i = 0; i = 0;
do do
i += 2; i += 2;
while (auxv[i - 2] != AT_NULL); while (auxv[i - 2] != AT_NULL);
fill_note(&notes[numnote++], "CORE", NT_AUXV, fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
i * sizeof(elf_addr_t), auxv); thread_status_size += notesize(&auxv_note);
/* Try to dump the FPU. */
if ((prstatus->pr_fpvalid =
elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
fill_note(notes + numnote++,
"CORE", NT_PRFPREG, sizeof(*fpu), fpu);
offset += sizeof(*elf); /* Elf header */ offset = sizeof(*elf); /* Elf header */
offset += segs * sizeof(struct elf_phdr); /* Program headers */ offset += segs * sizeof(struct elf_phdr); /* Program headers */
/* Write notes phdr entry */ /* Write notes phdr entry */
{
int sz = 0;
for (i = 0; i < numnote; i++)
sz += notesize(notes + i);
sz += thread_status_size;
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
if (!phdr4note) if (!phdr4note)
goto end_coredump; goto end_coredump;
fill_elf_note_phdr(phdr4note, sz, offset); fill_elf_note_phdr(phdr4note, thread_status_size, offset);
offset += sz; offset += thread_status_size;
}
/* Page-align dumped data */ /* Page-align dumped data */
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
...@@ -1747,12 +1720,18 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) ...@@ -1747,12 +1720,18 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump; goto end_coredump;
/* write out the notes section */ /* write out the notes section */
for (i = 0; i < numnote; i++) if (!writenote(thread_list->notes, cprm))
if (!writenote(notes + i, cprm)) goto end_coredump;
if (!writenote(&psinfo_note, cprm))
goto end_coredump;
if (!writenote(&auxv_note, cprm))
goto end_coredump;
for (i = 1; i < thread_list->num_notes; i++)
if (!writenote(thread_list->notes + i, cprm))
goto end_coredump; goto end_coredump;
/* write out the thread status notes section */ /* write out the thread status notes section */
for (tmp = thread_list; tmp; tmp = tmp->next) { for (tmp = thread_list->next; tmp; tmp = tmp->next) {
for (i = 0; i < tmp->num_notes; i++) for (i = 0; i < tmp->num_notes; i++)
if (!writenote(&tmp->notes[i], cprm)) if (!writenote(&tmp->notes[i], cprm))
goto end_coredump; goto end_coredump;
...@@ -1787,13 +1766,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm) ...@@ -1787,13 +1766,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
} }
kfree(phdr4note); kfree(phdr4note);
kfree(elf); kfree(elf);
kfree(prstatus);
kfree(psinfo); kfree(psinfo);
kfree(notes);
kfree(fpu);
kfree(shdr4extnum); kfree(shdr4extnum);
return has_dumped; return has_dumped;
#undef NUM_NOTES
} }
#endif /* CONFIG_ELF_CORE */ #endif /* CONFIG_ELF_CORE */
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