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file map: cause SIGBUS when access to a page beyond EOF

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Change-Id: Iaf7d792413e674267fd1c05c382212c8f67d8f5b
Refs: #1291
This commit is contained in:
Ken Sato
2019-08-30 13:46:06 +09:00
committed by Masamichi Takagi
parent 1492f16d67
commit c371fbf13b
7 changed files with 341 additions and 1 deletions
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19
executer/kernel/mcctrl/syscall.c
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@ -43,6 +43,7 @@
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/mount.h>
#include <linux/kdev_t.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/io.h>
@ -1153,8 +1154,9 @@ static int pager_req_read(ihk_os_t os, uintptr_t handle, off_t off, size_t size,
uintptr_t phys = -1;
ihk_device_t dev = ihk_os_to_dev(os);
void *buf = NULL;
loff_t pos;
loff_t pos, fsize;
unsigned long flags;
unsigned int major, minor;
dprintk("pager_req_read(%lx,%lx,%lx,%lx)\n", handle, off, size, rpa);
@ -1176,6 +1178,21 @@ static int pager_req_read(ihk_os_t os, uintptr_t handle, off_t off, size_t size,
goto out;
}
major = MAJOR(file->f_mapping->host->i_rdev);
minor = MINOR(file->f_mapping->host->i_rdev);
if ((major == 1 && minor == 1) || // /dev/mem
(major == 1 && minor == 5)) { // /dev/zero
/* Nothing to check */
}
else {
/* Check if the target page fits in the file */
fsize = i_size_read(file->f_mapping->host);
if (off > fsize) {
ss = 0;
goto out;
}
}
phys = ihk_device_map_memory(dev, rpa, size);
buf = ihk_device_map_virtual(dev, phys, size, NULL, 0);
if (!buf) {