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mm: mark a vma as stack, if a value of sp is in it

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/proc/PID/maps can contains not up to date information about a stack vma.
A kernel marks a VMA as stack, if thread_struct->usersp is in it,
but usersp is updated, when a process calls a syscall.

This problem is occured, when we try to dump/restore a process in a loop.
When a restorer resumes a process, a restorer vma will be marked as stack.

A thread stack should not be marked as stack, because its vma is mapped
w/o MAP_GROWSDOWN.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-09-07 18:21:04 +04:00
committed by Pavel Emelyanov
parent 0e0da2de9e
commit 0ae2bad0c6
5 changed files with 26 additions and 6 deletions
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5
proc_parse.c
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@@ -144,10 +144,7 @@ int parse_smaps(pid_t pid, struct list_head *vma_area_list, bool use_map_files)
goto err;
}
if (strstr(buf, "[stack")) {
vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_STACK;
vma_area->vma.flags |= MAP_GROWSDOWN;
} else if (strstr(buf, "[vsyscall]")) {
if (strstr(buf, "[vsyscall]")) {
vma_area->vma.status |= VMA_AREA_VSYSCALL;
} else if (strstr(buf, "[vdso]")) {
vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_VDSO;