It is NOT OK to just munmap memory from malloc :/.

[apt.git] / apt-pkg / contrib / mmap.cc

diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index 9945b160679d081469d3ee3c7ccdf4d51a127b4c..f63f2eea1a9c6080d3df07c0a7e22002603e1c96 100644 (file)
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -16,29 +16,30 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/

-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
+#include <config.h>
+

 #include <apt-pkg/mmap.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/mmap.h>
 #include <apt-pkg/error.h>

+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/macros.h>

 
 

-#include <apti18n.h>
-
+#include <string>

 #include <sys/mman.h>
 #include <sys/mman.h>

-#include <sys/stat.h>

 #include <unistd.h>
 #include <unistd.h>

-#include <fcntl.h>

 #include <stdlib.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <errno.h>

-

 #include <cstring>
 #include <cstring>

-                                                                       /*}}}*/
+
+#include <apti18n.h>
+                                                                       /*}}}*/

 
 // MMap::MMap - Constructor                                            /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0),
 
 // MMap::MMap - Constructor                                            /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0),

-                     Base(0), SyncToFd(NULL)
+                     Base(nullptr), SyncToFd(nullptr)

 {
 {

-   if ((Flags & NoImmMap) != NoImmMap)

       Map(F);
 }
                                                                        /*}}}*/
       Map(F);
 }
                                                                        /*}}}*/


@@ -46,7 +47,7 @@ MMap::MMap(FileFd &F,unsigned long Flags) : Flags(Flags), iSize(0),
 // ---------------------------------------------------------------------
 /* */
 MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0),
 // ---------------------------------------------------------------------
 /* */
 MMap::MMap(unsigned long Flags) : Flags(Flags), iSize(0),

-                     Base(0), SyncToFd(NULL)
+                     Base(nullptr), SyncToFd(nullptr)

 {
 }
                                                                        /*}}}*/
 {
 }
                                                                        /*}}}*/


@@ -64,7 +65,7 @@ MMap::~MMap()
 bool MMap::Map(FileFd &Fd)
 {
    iSize = Fd.Size();
 bool MMap::Map(FileFd &Fd)
 {
    iSize = Fd.Size();

-   
+

    // Set the permissions.
    int Prot = PROT_READ;
    int Map = MAP_SHARED;
    // Set the permissions.
    int Prot = PROT_READ;
    int Map = MAP_SHARED;


@@ -75,27 +76,52 @@ bool MMap::Map(FileFd &Fd)
    
    if (iSize == 0)
       return _error->Error(_("Can't mmap an empty file"));
    
    if (iSize == 0)
       return _error->Error(_("Can't mmap an empty file"));

-   
+
+   // We can't mmap compressed fd's directly, so we need to read it completely
+   if (Fd.IsCompressed() == true)
+   {
+      if ((Flags & ReadOnly) != ReadOnly)
+        return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str());
+      Base = malloc(iSize);
+      if (unlikely(Base == nullptr))
+        return _error->Errno("MMap-compressed-malloc", _("Couldn't make mmap of %llu bytes"), iSize);
+      SyncToFd = new FileFd();
+      if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false)
+        return _error->Error("Compressed file %s can't be read into mmap", Fd.Name().c_str());
+      return true;
+   }
+

    // Map it.
    // Map it.

-   Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0);
-   if (Base == (void *)-1)
+   Base = (Flags & Fallback) ? MAP_FAILED : mmap(0,iSize,Prot,Map,Fd.Fd(),0);
+   if (Base == MAP_FAILED)

    {
    {

-      if (errno == ENODEV || errno == EINVAL)
+      if (errno == ENODEV || errno == EINVAL || (Flags & Fallback))

       {
         // The filesystem doesn't support this particular kind of mmap.
         // So we allocate a buffer and read the whole file into it.
       {
         // The filesystem doesn't support this particular kind of mmap.
         // So we allocate a buffer and read the whole file into it.

+        if ((Flags & ReadOnly) == ReadOnly)
+        {
+           // for readonly, we don't need sync, so make it simple
+           Base = malloc(iSize);
+           if (unlikely(Base == nullptr))
+              return _error->Errno("MMap-malloc", _("Couldn't make mmap of %llu bytes"), iSize);
+           SyncToFd = new FileFd();
+           return Fd.Seek(0L) && Fd.Read(Base, iSize);
+        }
+        // FIXME: Writing to compressed fd's ?

         int const dupped_fd = dup(Fd.Fd());
         if (dupped_fd == -1)
            return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd());
 
         int const dupped_fd = dup(Fd.Fd());
         if (dupped_fd == -1)
            return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd());
 

-        Base = new unsigned char[iSize];
+        Base = malloc(iSize);
+        if (unlikely(Base == nullptr))
+           return _error->Errno("MMap-calloc", _("Couldn't make mmap of %llu bytes"), iSize);

         SyncToFd = new FileFd (dupped_fd);
         if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize))
            return false;
       }
       else
         SyncToFd = new FileFd (dupped_fd);
         if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize))
            return false;
       }
       else

-        return _error->Errno("mmap",_("Couldn't make mmap of %lu bytes"),
-                             iSize);
+        return _error->Errno("MMap-mmap", _("Couldn't make mmap of %llu bytes"), iSize);

      }
 
    return true;
      }
 
    return true;


@@ -114,7 +140,7 @@ bool MMap::Close(bool DoSync)
 
    if (SyncToFd != NULL)
    {
 
    if (SyncToFd != NULL)
    {

-      delete[] (char *)Base;
+      free(Base);

       delete SyncToFd;
       SyncToFd = NULL;
    }
       delete SyncToFd;
       SyncToFd = NULL;
    }


@@ -134,11 +160,10 @@ bool MMap::Close(bool DoSync)
 /* This is done in syncronous mode - the docs indicate that this will 
    not return till all IO is complete */
 bool MMap::Sync()
 /* This is done in syncronous mode - the docs indicate that this will 
    not return till all IO is complete */
 bool MMap::Sync()

-{   
+{

    if ((Flags & UnMapped) == UnMapped)
       return true;
    if ((Flags & UnMapped) == UnMapped)
       return true;

-   
-#ifdef _POSIX_SYNCHRONIZED_IO   
+

    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != NULL)
    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != NULL)


@@ -148,11 +173,12 @@ bool MMap::Sync()
       }
       else
       {
       }
       else
       {

+#ifdef _POSIX_SYNCHRONIZED_IO

         if (msync((char *)Base, iSize, MS_SYNC) < 0)
            return _error->Errno("msync", _("Unable to synchronize mmap"));
         if (msync((char *)Base, iSize, MS_SYNC) < 0)
            return _error->Errno("msync", _("Unable to synchronize mmap"));

+#endif

       }
    }
       }
    }

-#endif   

    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/


@@ -163,24 +189,25 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
 {
    if ((Flags & UnMapped) == UnMapped)
       return true;
 {
    if ((Flags & UnMapped) == UnMapped)
       return true;

-   
-#ifdef _POSIX_SYNCHRONIZED_IO
-   unsigned long PSize = sysconf(_SC_PAGESIZE);
+

    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != 0)
       {
    if ((Flags & ReadOnly) != ReadOnly)
    {
       if (SyncToFd != 0)
       {

-        if (!SyncToFd->Seek(0) ||
+        if (!SyncToFd->Seek(Start) ||

             !SyncToFd->Write (((char *)Base)+Start, Stop-Start))
            return false;
       }
       else
       {
             !SyncToFd->Write (((char *)Base)+Start, Stop-Start))
            return false;
       }
       else
       {

-        if (msync((char *)Base+(int)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0)
+#ifdef _POSIX_SYNCHRONIZED_IO
+        unsigned long long const PSize = sysconf(_SC_PAGESIZE);
+         Start = (Start/PSize)*PSize;
+        if (msync((char *)Base+Start, Stop - Start, MS_SYNC) < 0)

            return _error->Errno("msync", _("Unable to synchronize mmap"));
            return _error->Errno("msync", _("Unable to synchronize mmap"));

+#endif

       }
    }
       }
    }

-#endif   

    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/


@@ -190,13 +217,20 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
 /* */
 DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Workspace,
                         unsigned long const &Grow, unsigned long const &Limit) :
 /* */
 DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Workspace,
                         unsigned long const &Grow, unsigned long const &Limit) :

-               MMap(F,Flags | NoImmMap), Fd(&F), WorkSpace(Workspace),
+               MMap(Flags), Fd(&F), WorkSpace(Workspace),

                GrowFactor(Grow), Limit(Limit)
 {
                GrowFactor(Grow), Limit(Limit)
 {

-   if (_error->PendingError() == true)
-      return;
-   
-   unsigned long EndOfFile = Fd->Size();
+   // disable Moveable if we don't grow
+   if (Grow == 0)
+      this->Flags &= ~Moveable;
+
+#ifndef __linux__
+   // kfreebsd doesn't have mremap, so we use the fallback
+   if ((this->Flags & Moveable) == Moveable)
+      this->Flags |= Fallback;
+#endif
+
+   unsigned long long EndOfFile = Fd->Size();

    if (EndOfFile > WorkSpace)
       WorkSpace = EndOfFile;
    else if(WorkSpace > 0)
    if (EndOfFile > WorkSpace)
       WorkSpace = EndOfFile;
    else if(WorkSpace > 0)


@@ -217,12 +251,9 @@ DynamicMMap::DynamicMMap(FileFd &F,unsigned long Flags,unsigned long const &Work
    and could come in handy later than we are able to grow such an mmap */
 DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
                         unsigned long const &Grow, unsigned long const &Limit) :
    and could come in handy later than we are able to grow such an mmap */
 DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
                         unsigned long const &Grow, unsigned long const &Limit) :

-               MMap(Flags | NoImmMap | UnMapped), Fd(0), WorkSpace(WorkSpace),
+               MMap(Flags | UnMapped), Fd(0), WorkSpace(WorkSpace),

                GrowFactor(Grow), Limit(Limit)
 {
                GrowFactor(Grow), Limit(Limit)
 {

-       if (_error->PendingError() == true)
-               return;
-

        // disable Moveable if we don't grow
        if (Grow == 0)
                this->Flags &= ~Moveable;
        // disable Moveable if we don't grow
        if (Grow == 0)
                this->Flags &= ~Moveable;


@@ -237,11 +268,19 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
        if ((this->Flags & Fallback) != Fallback) {
                // Set the permissions.
                int Prot = PROT_READ;
        if ((this->Flags & Fallback) != Fallback) {
                // Set the permissions.
                int Prot = PROT_READ;

+#ifdef MAP_ANONYMOUS

                int Map = MAP_PRIVATE | MAP_ANONYMOUS;
                int Map = MAP_PRIVATE | MAP_ANONYMOUS;

+#else
+               int Map = MAP_PRIVATE | MAP_ANON;
+#endif

                if ((this->Flags & ReadOnly) != ReadOnly)
                        Prot |= PROT_WRITE;
                if ((this->Flags & Public) == Public)
                if ((this->Flags & ReadOnly) != ReadOnly)
                        Prot |= PROT_WRITE;
                if ((this->Flags & Public) == Public)

+#ifdef MAP_ANONYMOUS

                        Map = MAP_SHARED | MAP_ANONYMOUS;
                        Map = MAP_SHARED | MAP_ANONYMOUS;

+#else
+                       Map = MAP_SHARED | MAP_ANON;
+#endif

 
                // use anonymous mmap() to get the memory
                Base = (unsigned char*) mmap(0, WorkSpace, Prot, Map, -1, 0);
 
                // use anonymous mmap() to get the memory
                Base = (unsigned char*) mmap(0, WorkSpace, Prot, Map, -1, 0);


@@ -254,8 +293,7 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
        }
 #endif
        // fallback to a static allocated space
        }
 #endif
        // fallback to a static allocated space

-       Base = new unsigned char[WorkSpace];
-       memset(Base,0,WorkSpace);
+       Base = calloc(WorkSpace, 1);

        iSize = 0;
 }
                                                                        /*}}}*/
        iSize = 0;
 }
                                                                        /*}}}*/


@@ -269,14 +307,15 @@ DynamicMMap::~DynamicMMap()
       if (validData() == false)
         return;
 #ifdef _POSIX_MAPPED_FILES
       if (validData() == false)
         return;
 #ifdef _POSIX_MAPPED_FILES

-      munmap(Base, WorkSpace);
-#else
-      delete [] (unsigned char *)Base;
+      if ((Flags & Fallback) != Fallback) {
+         munmap(Base, WorkSpace);
+      } else

 #endif
 #endif

+      free(Base);

       return;
    }
    
       return;
    }
    

-   unsigned long EndOfFile = iSize;
+   unsigned long long EndOfFile = iSize;

    iSize = WorkSpace;
    Close(false);
    if(ftruncate(Fd->Fd(),EndOfFile) < 0)
    iSize = WorkSpace;
    Close(false);
    if(ftruncate(Fd->Fd(),EndOfFile) < 0)


@@ -286,9 +325,9 @@ DynamicMMap::~DynamicMMap()
 // DynamicMMap::RawAllocate - Allocate a raw chunk of unaligned space  /*{{{*/
 // ---------------------------------------------------------------------
 /* This allocates a block of memory aligned to the given size */
 // DynamicMMap::RawAllocate - Allocate a raw chunk of unaligned space  /*{{{*/
 // ---------------------------------------------------------------------
 /* This allocates a block of memory aligned to the given size */

-unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln)
+unsigned long DynamicMMap::RawAllocate(unsigned long long Size,unsigned long Aln)

 {
 {

-   unsigned long Result = iSize;
+   unsigned long long Result = iSize;

    if (Aln != 0)
       Result += Aln - (iSize%Aln);
 
    if (Aln != 0)
       Result += Aln - (iSize%Aln);
 


@@ -300,7 +339,7 @@ unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln)
       if(!Grow())
       {
         _error->Fatal(_("Dynamic MMap ran out of room. Please increase the size "
       if(!Grow())
       {
         _error->Fatal(_("Dynamic MMap ran out of room. Please increase the size "

-                        "of APT::Cache-Limit. Current value: %lu. (man 5 apt.conf)"), WorkSpace);
+                        "of APT::Cache-Start. Current value: %lu. (man 5 apt.conf)"), WorkSpace);

         return 0;
       }
    }
         return 0;
       }
    }


@@ -313,6 +352,12 @@ unsigned long DynamicMMap::RawAllocate(unsigned long Size,unsigned long Aln)
    size in the file. */
 unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
 {
    size in the file. */
 unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
 {

+   if (unlikely(ItemSize == 0))
+   {
+      _error->Fatal("Can't allocate an item of size zero");
+      return 0;
+   }
+

    // Look for a matching pool entry
    Pool *I;
    Pool *Empty = 0;
    // Look for a matching pool entry
    Pool *I;
    Pool *Empty = 0;


@@ -345,12 +390,15 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
       const unsigned long size = 20*1024;
       I->Count = size/ItemSize;
       Pool* oldPools = Pools;
       const unsigned long size = 20*1024;
       I->Count = size/ItemSize;
       Pool* oldPools = Pools;

+      _error->PushToStack();

       Result = RawAllocate(size,ItemSize);
       Result = RawAllocate(size,ItemSize);

+      bool const newError = _error->PendingError();
+      _error->MergeWithStack();

       if (Pools != oldPools)
         I += Pools - oldPools;
 
       // Does the allocation failed ?
       if (Pools != oldPools)
         I += Pools - oldPools;
 
       // Does the allocation failed ?

-      if (Result == 0 && _error->PendingError())
+      if (Result == 0 && newError)

         return 0;
       I->Start = Result;
    }
         return 0;
       I->Start = Result;
    }


@@ -364,18 +412,28 @@ unsigned long DynamicMMap::Allocate(unsigned long ItemSize)
                                                                        /*}}}*/
 // DynamicMMap::WriteString - Write a string to the file               /*{{{*/
 // ---------------------------------------------------------------------
                                                                        /*}}}*/
 // DynamicMMap::WriteString - Write a string to the file               /*{{{*/
 // ---------------------------------------------------------------------

-/* Strings are not aligned to anything */
+/* Strings are aligned to 16 bytes */

 unsigned long DynamicMMap::WriteString(const char *String,
                                       unsigned long Len)
 {
    if (Len == (unsigned long)-1)
       Len = strlen(String);
 
 unsigned long DynamicMMap::WriteString(const char *String,
                                       unsigned long Len)
 {
    if (Len == (unsigned long)-1)
       Len = strlen(String);
 

-   unsigned long const Result = RawAllocate(Len+1,0);
+   _error->PushToStack();
+   unsigned long Result = RawAllocate(Len+1+sizeof(uint16_t),sizeof(uint16_t));
+   bool const newError = _error->PendingError();
+   _error->MergeWithStack();

 
 

-   if (Result == 0 && _error->PendingError())
+   if (Base == NULL || (Result == 0 && newError))

       return 0;
 
       return 0;
 

+   if (Len >= std::numeric_limits<uint16_t>::max())
+      abort();
+
+   uint16_t LenToWrite = Len;
+   memcpy((char *)Base + Result, &LenToWrite, sizeof(LenToWrite));
+   Result += + sizeof(LenToWrite);
+

    memcpy((char *)Base + Result,String,Len);
    ((char *)Base)[Result + Len] = 0;
    return Result;
    memcpy((char *)Base + Result,String,Len);
    ((char *)Base)[Result + Len] = 0;
    return Result;


@@ -403,7 +461,7 @@ bool DynamicMMap::Grow() {
        if (GrowFactor <= 0)
                return _error->Error(_("Unable to increase size of the MMap as automatic growing is disabled by user."));
 
        if (GrowFactor <= 0)
                return _error->Error(_("Unable to increase size of the MMap as automatic growing is disabled by user."));
 

-       unsigned long const newSize = WorkSpace + GrowFactor;
+       unsigned long long const newSize = WorkSpace + GrowFactor;

 
        if(Fd != 0) {
                Fd->Seek(newSize - 1);
 
        if(Fd != 0) {
                Fd->Seek(newSize - 1);


@@ -432,9 +490,14 @@ bool DynamicMMap::Grow() {
                if ((Flags & Moveable) != Moveable)
                        return false;
 
                if ((Flags & Moveable) != Moveable)
                        return false;
 

-               Base = realloc(Base, newSize);
-               if (Base == NULL)
+               auto Temp = realloc(Base, newSize);
+               if (Temp == NULL)

                        return false;
                        return false;

+               else {
+                       Base = Temp;
+                       /* Set new memory to 0 */
+                       memset((char*)Base + WorkSpace, 0, newSize - WorkSpace);
+               }

        }
 
        Pools =(Pool*) Base + poolOffset;
        }
 
        Pools =(Pool*) Base + poolOffset;