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mount: Prohibit second binfmt_misc superblock

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This is need to catch the moment when binfmt_misc in mainline kernel is virtualized

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Kirill Tkhai
2016-09-13 17:50:05 +03:00
committed by Pavel Emelyanov
parent 6e83f54314
commit a5875ece59
1 changed files with 7 additions and 0 deletions
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7
criu/mount.c
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@@ -1461,6 +1461,7 @@ err:
static int binfmt_misc_dump(struct mount_info *pm) static int binfmt_misc_dump(struct mount_info *pm)
{ {
static bool dumped = false;
struct cr_img *img = NULL; struct cr_img *img = NULL;
struct dirent *de; struct dirent *de;
DIR *fdir = NULL; DIR *fdir = NULL;
@@ -1470,6 +1471,12 @@ static int binfmt_misc_dump(struct mount_info *pm)
if (ret <= 0) if (ret <= 0)
return ret; return ret;
if (dumped) {
pr_err("Second binfmt_misc superblock\n");
return -1;
}
dumped = true;
fd = open_mountpoint(pm); fd = open_mountpoint(pm);
if (fd < 0) if (fd < 0)
return fd; return fd;