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Prevent escaping the root filesystem.

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This commit is contained in:
Jonas 'Sortie' Termansen 2013-05-29 23:01:46 +02:00
parent 871469d443
commit 6a62446bab
1 changed files with 11 additions and 1 deletions
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12
sortix/vnode.cpp
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@ -25,6 +25,7 @@
#include <sortix/kernel/platform.h> #include <sortix/kernel/platform.h>
#include <sortix/kernel/refcount.h> #include <sortix/kernel/refcount.h>
#include <sortix/kernel/ioctx.h> #include <sortix/kernel/ioctx.h>
#include <sortix/kernel/descriptor.h>
#include <sortix/kernel/inode.h> #include <sortix/kernel/inode.h>
#include <sortix/kernel/vnode.h> #include <sortix/kernel/vnode.h>
#include <sortix/kernel/mtable.h> #include <sortix/kernel/mtable.h>
@ -68,9 +69,18 @@ Vnode::~Vnode()
Ref<Vnode> Vnode::open(ioctx_t* ctx, const char* filename, int flags, mode_t mode) Ref<Vnode> Vnode::open(ioctx_t* ctx, const char* filename, int flags, mode_t mode)
{ {
bool dotdot = strcmp(filename, "..") == 0;
// Prevent escaping the root filesystem.
if ( dotdot )
{
Ref<Descriptor> root = CurrentProcess()->GetRoot();
if ( root->ino == ino && root->dev == dev )
return Ref<Vnode>(this);
}
// Handle transition across filesystem mount points. // Handle transition across filesystem mount points.
bool isroot = inode->ino == rootino && inode->dev == rootdev; bool isroot = inode->ino == rootino && inode->dev == rootdev;
bool dotdot = strcmp(filename, "..") == 0;
if ( isroot && dotdot && mountedat ) if ( isroot && dotdot && mountedat )
return mountedat; return mountedat;