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Replace remaining hard-coded TASK_SIZE use

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If we want one CRIU binary to work across all AArch64 kernel
configurations, a single task size value cannot be hard coded. While
trivial applications successfully checkpoint and restore on AArch64
kernels with CONFIG_ARM64_64K_PAGES=y without this patch, replacing
the remaining use of the hard-coded value seems like the best way to
guard against failures that more complex process trees and future uses
may expose.

Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Christopher Covington
2015-07-31 10:36:27 -04:00
committed by Pavel Emelyanov
parent 1438f013a2
commit f9ae6d9dd4
6 changed files with 10 additions and 11 deletions
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7
arch/aarch64/include/asm/types.h
View File

@@ -61,15 +61,12 @@ typedef struct user_pt_regs user_regs_struct_t;
#define REG_IP(regs) ((u64)(regs).pc)
#define REG_SYSCALL_NR(regs) ((u64)(regs).regs[8])
// Copied from the Linux kernel arch/arm64/include/asm/memory.h
// FIXME: what about a 32bit task?
#define TASK_SIZE (1ULL << 39)
/*
* Range for task size calculated from the following Linux kernel files:
* arch/arm64/include/asm/memory.h
* arch/arm64/Kconfig
*
* TODO: handle 32 bit tasks
*/
#define TASK_SIZE_MIN (1UL << 39)
#define TASK_SIZE_MAX (1UL << 48)

2
arch/aarch64/vdso.c
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@@ -87,7 +87,7 @@ int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,
continue;
}
if (vma->e->start > TASK_SIZE)
if (vma->e->start > kdat.task_size)
continue;
if (vma->e->flags & MAP_GROWSDOWN)

3
arch/arm/crtools.c
View File

@@ -18,6 +18,7 @@
#include "parasite-syscall.h"
#include "restorer.h"
#include "errno.h"
#include "kerndat.h"
/*
@@ -212,7 +213,7 @@ void *mmap_seized(struct parasite_ctl *ctl,
err = syscall_seized(ctl, __NR_mmap2, &map,
(unsigned long)addr, length, prot, flags, fd, offset >> 12);
if (err < 0 || map > TASK_SIZE)
if (err < 0 || map > kdat.task_size)
map = 0;
return (void *)map;

2
cr-restore.c
View File

@@ -2009,7 +2009,7 @@ static long restorer_get_vma_hint(struct list_head *tgt_vma_list,
VmaEntry end_e;
end_vma.e = &end_e;
end_e.start = end_e.end = TASK_SIZE;
end_e.start = end_e.end = kdat.task_size;
prev_vma_end = PAGE_SIZE * 0x10; /* CONFIG_LSM_MMAP_MIN_ADDR=65536 */
s_vma = list_first_entry(self_vma_list, struct vma_area, list);

5
pagemap-cache.c
View File

@@ -7,6 +7,7 @@
#include "util.h"
#include "log.h"
#include "vma.h"
#include "kerndat.h"
#undef LOG_PREFIX
#define LOG_PREFIX "pagemap-cache: "
@@ -66,8 +67,8 @@ static int pmc_fill_cache(pmc_t *pmc, struct vma_area *vma)
size_t len = vma_area_len(vma);
size_t size_map;
if (high > TASK_SIZE)
high = TASK_SIZE;
if (high > kdat.task_size)
high = kdat.task_size;
pmc->start = vma->e->start;
pmc->end = vma->e->end;

2
parasite-syscall.c
View File

@@ -56,7 +56,7 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
struct vma_area *vma_area;
list_for_each_entry(vma_area, vma_area_list, list) {
if (vma_area->e->start >= TASK_SIZE)
if (vma_area->e->start >= kdat.task_size)
continue;
if (!(vma_area->e->prot & PROT_EXEC))
continue;