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kernel: ramdisks may not be multiples of page sizes

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This commit is contained in:
K. Lange 2018-12-13 10:49:07 +09:00
parent 164fa6447b
commit 495d4b31de
1 changed files with 8 additions and 2 deletions
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8
kernel/fs/ramdisk.c
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@ -65,9 +65,15 @@ static int ioctl_ramdisk(fs_node_t * node, int request, void * argp) {
return -EPERM;
} else {
/* Clear all of the memory used by this ramdisk */
for (uintptr_t i = node->inode; i < node->inode + node->length; i += 0x1000) {
if (node->length >= 0x1000) {
if (node->length % 0x1000) {
/* It would be a very bad idea to wipe the wrong page here. */
node->length -= node->length % 0x1000;
}
for (uintptr_t i = node->inode; i < (node->inode + node->length); i += 0x1000) {
clear_frame(i);
}
}
/* Mark the file length as 0 */
node->length = 0;
return 0;