mir/criu
2
0
Fork 0
mirror of https://github.com/checkpoint-restore/criu synced 2025-08-29 05:18:00 +00:00
Code Issues Releases Wiki Activity

vdso: Separate checks for {vdso, vvar}-alikeness

Browse Source 
No functional change expected.

Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Dmitry Safonov 2017-07-10 21:24:20 +03:00 committed by Andrei Vagin
parent 8da2d8f282
commit c7eb920fe1
1 changed files with 21 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
criu/vdso.c
View File

@ -89,6 +89,26 @@ static int check_vdso_by_pfn(int pagemap_fd, struct vma_area *vma,
return 0;
}
static bool not_vvar_or_vdso(struct vma_area *vma)
{
if (!vma_area_is(vma, VMA_AREA_REGULAR))
return true;
if (vma_area_is(vma, VMA_FILE_SHARED))
return true;
if (vma_area_is(vma, VMA_FILE_PRIVATE))
return true;
if (vma->e->start > kdat.task_size)
return true;
if (vma->e->flags & MAP_GROWSDOWN)
return true;
return false;
}
/*
* The VMAs list might have proxy vdso/vvar areas left
* from previous dump/restore cycle so we need to detect
@ -119,12 +139,9 @@ int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,
list_for_each_entry(vma, &vma_area_list->h, list) {
bool has_vdso_pfn = false;
if (!vma_area_is(vma, VMA_AREA_REGULAR))
if (not_vvar_or_vdso(vma))
continue;
if (vma_area_is(vma, VMA_FILE_SHARED) ||
vma_area_is(vma, VMA_FILE_PRIVATE))
continue;
/*
* It might be possible VVAR area from marked
* vDSO zone, we need to detect it earlier than
@ -146,12 +163,6 @@ int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,
if ((vma->e->prot & VDSO_PROT) != VDSO_PROT)
continue;
if (vma->e->start > kdat.task_size)
continue;
if (vma->e->flags & MAP_GROWSDOWN)
continue;
/*
* I need to poke every potentially marked vma,
* otherwise if task never called for vdso functions