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Commit 88dc7e9d authored by jonas@perch.ndb.mysql.com's avatar jonas@perch.ndb.mysql.com
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ndb - bug#33750 

    make sure that getField does not write after supplied buffer
    (recommit to correct clone, for easy merging)
parent 0d4bf93e
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Showing with 464 additions and 306 deletions
ndb/include/util/Bitmask.hpp
View file @ 88dc7e9d
......@@ -126,6 +126,7 @@ public:
/**
* setField - Set bitfield at given position and length (max 32 bits)
* Note : length == 0 not supported.
*/
static void setField(unsigned size, Uint32 data[],
unsigned pos, unsigned len, Uint32 val);
......@@ -133,6 +134,7 @@ public:
/**
* getField - Get bitfield at given position and length
* Note : length == 0 not supported.
*/
static void getField(unsigned size, const Uint32 data[],
unsigned pos, unsigned len, Uint32 dst[]);
......@@ -814,6 +816,9 @@ BitmaskImpl::getField(unsigned size, const Uint32 src[],
unsigned pos, unsigned len, Uint32 dst[])
{
assert(pos + len <= (size << 5));
assert (len != 0);
if (len == 0)
return;
src += (pos >> 5);
Uint32 offset = pos & 31;
......@@ -833,6 +838,9 @@ BitmaskImpl::setField(unsigned size, Uint32 dst[],
unsigned pos, unsigned len, const Uint32 src[])
{
assert(pos + len <= (size << 5));
assert(len != 0);
if (len == 0)
return;
dst += (pos >> 5);
Uint32 offset = pos & 31;
......
ndb/src/common/util/Bitmask.cpp
View file @ 88dc7e9d
......@@ -16,34 +16,42 @@
#include <Bitmask.hpp>
#include <NdbOut.hpp>
static
void print(const Uint32 src[], Uint32 len, Uint32 pos = 0)
{
printf("b'");
for(unsigned i = 0; i<len; i++)
{
if(BitmaskImpl::get((pos + len + 31) >> 5, src, i+pos))
printf("1");
else
printf("0");
if((i & 31) == 31)
printf(" ");
}
}
#ifndef __TEST_BITMASK__
void
BitmaskImpl::getFieldImpl(const Uint32 src[],
unsigned shiftL, unsigned len, Uint32 dst[])
{
/* Copy whole words of src to dst, shifting src left
* by shiftL. Undefined bits of the last written dst word
* should be zeroed.
*/
assert(shiftL < 32);
unsigned shiftR = 32 - shiftL;
unsigned undefined = shiftL ? ~0 : 0;
/* Merge first word with previously set bits if there's a shift */
* dst = shiftL ? * dst : 0;
/* Treat the zero-shift case separately to avoid
* trampling or reading past the end of src
*/
if (shiftL == 0)
{
while(len >= 32)
{
* dst++ = * src++;
len -=32;
}
if (len != 0)
{
/* Last word has some bits set */
Uint32 mask= ((1 << len) -1); // 0000111
* dst = (* src) & mask;
}
}
else // shiftL !=0, need to build each word from two words shifted
{
while(len >= 32)
{
* dst++ |= (* src) << shiftL;
......@@ -51,15 +59,21 @@ BitmaskImpl::getFieldImpl(const Uint32 src[],
len -= 32;
}
if(len < shiftR)
/* Have space for shiftR more bits in the current dst word
* is that enough?
*/
if(len <= shiftR)
{
/* Fit the remaining bits in the current dst word */
* dst |= ((* src) & ((1 << len) - 1)) << shiftL;
}
else
{
/* Need to write to two dst words */
* dst++ |= ((* src) << shiftL);
* dst = ((* src) >> shiftR) & ((1 << (len - shiftR)) - 1) & undefined;
}
}
}
void
......@@ -81,286 +95,23 @@ BitmaskImpl::setFieldImpl(Uint32 dst[],
len -= 32;
}
/* Copy last bits */
Uint32 mask = ((1 << len) -1);
* dst = (* dst & ~mask);
if(len < shiftR)
if(len <= shiftR)
{
/* Remaining bits fit in current word */
* dst |= ((* src++) >> shiftL) & mask;
}
else
{
/* Remaining bits update 2 words */
* dst |= ((* src++) >> shiftL);
* dst |= ((* src) & ((1 << (len - shiftR)) - 1)) << shiftR ;
}
}
#else
#define DEBUG 0
#include <Vector.hpp>
static void do_test(int bitmask_size);
int
main(int argc, char** argv)
{
int loops = argc > 1 ? atoi(argv[1]) : 1000;
int max_size = argc > 2 ? atoi(argv[2]) : 1000;
for(int i = 0; i<loops; i++)
do_test(1 + (rand() % max_size));
}
struct Alloc
{
Uint32 pos;
Uint32 size;
Vector<Uint32> data;
};
static void require(bool b)
{
if(!b) abort();
}
static
bool cmp(const Uint32 b1[], const Uint32 b2[], Uint32 len)
{
Uint32 sz32 = (len + 31) >> 5;
for(int i = 0; i<len; i++)
{
if(BitmaskImpl::get(sz32, b1, i) ^ BitmaskImpl::get(sz32, b2, i))
return false;
}
return true;
}
static int val_pos = 0;
static int val[] = { 384, 241, 32,
1,1,1,1, 0,0,0,0, 1,1,1,1, 0,0,0,0,
241 };
static int lrand()
{
#if 0
return val[val_pos++];
#else
return rand();
#endif
}
static
void rand(Uint32 dst[], Uint32 len)
{
for(int i = 0; i<len; i++)
BitmaskImpl::set((len + 31) >> 5, dst, i, (lrand() % 1000) > 500);
}
static
void simple(int pos, int size)
{
ndbout_c("simple pos: %d size: %d", pos, size);
Vector<Uint32> _mask;
Vector<Uint32> _src;
Vector<Uint32> _dst;
Uint32 sz32 = (size + pos + 32) >> 5;
const Uint32 sz = 4 * sz32;
Uint32 zero = 0;
_mask.fill(sz32+1, zero);
_src.fill(sz32+1, zero);
_dst.fill(sz32+1, zero);
Uint32 * src = _src.getBase();
Uint32 * dst = _dst.getBase();
Uint32 * mask = _mask.getBase();
memset(src, 0x0, sz);
memset(dst, 0x0, sz);
memset(mask, 0xFF, sz);
rand(src, size);
BitmaskImpl::setField(sz32, mask, pos, size, src);
BitmaskImpl::getField(sz32, mask, pos, size, dst);
printf("src: "); print(src, size+31); printf("\n");
printf("msk: "); print(mask, (sz32 << 5) + 31); printf("\n");
printf("dst: "); print(dst, size+31); printf("\n");
require(cmp(src, dst, size+31));
};
static
void simple2(int size, int loops)
{
ndbout_c("simple2 %d - ", size);
Vector<Uint32> _mask;
Vector<Uint32> _src;
Vector<Uint32> _dst;
Uint32 sz32 = (size + 32) >> 5;
Uint32 sz = sz32 << 2;
Uint32 zero = 0;
_mask.fill(sz32+1, zero);
_src.fill(sz32+1, zero);
_dst.fill(sz32+1, zero);
Uint32 * src = _src.getBase();
Uint32 * dst = _dst.getBase();
Uint32 * mask = _mask.getBase();
Vector<Uint32> save;
for(int i = 0; i<loops; i++)
{
memset(mask, 0xFF, sz);
memset(dst, 0xFF, sz);
int len;
int pos = 0;
while(pos+1 < size)
{
memset(src, 0xFF, sz);
while(!(len = rand() % (size - pos)));
BitmaskImpl::setField(sz32, mask, pos, len, src);
if(memcmp(dst, mask, sz))
{
ndbout_c("pos: %d len: %d", pos, len);
print(mask, size);
abort();
}
printf("[ %d %d ]", pos, len);
save.push_back(pos);
save.push_back(len);
pos += len;
}
for(int j = 0; j<save.size(); )
{
pos = save[j++];
len = save[j++];
memset(src, 0xFF, sz);
BitmaskImpl::getField(sz32, mask, pos, len, src);
if(memcmp(dst, src, sz))
{
ndbout_c("pos: %d len: %d", pos, len);
printf("src: "); print(src, size); printf("\n");
printf("dst: "); print(dst, size); printf("\n");
printf("msk: "); print(mask, size); printf("\n");
abort();
}
}
ndbout_c("");
}
}
static void
do_test(int bitmask_size)
{
#if 1
simple(rand() % 33, (rand() % 63)+1);
//#else
Vector<Alloc> alloc_list;
bitmask_size = (bitmask_size + 31) & ~31;
Uint32 sz32 = (bitmask_size >> 5);
Vector<Uint32> alloc_mask;
Vector<Uint32> test_mask;
ndbout_c("Testing bitmask of size %d", bitmask_size);
Uint32 zero = 0;
alloc_mask.fill(sz32, zero);
test_mask.fill(sz32, zero);
for(int i = 0; i<5000; i++)
{
Vector<Uint32> tmp;
tmp.fill(sz32, zero);
int pos = lrand() % (bitmask_size - 1);
int free = 0;
if(BitmaskImpl::get(sz32, alloc_mask.getBase(), pos))
{
// Bit was allocated
// 1) Look up allocation
// 2) Check data
// 3) free it
size_t j;
int min, max;
for(j = 0; j<alloc_list.size(); j++)
{
min = alloc_list[j].pos;
max = min + alloc_list[j].size;
if(pos >= min && pos < max)
{
break;
}
}
require(pos >= min && pos < max);
BitmaskImpl::getField(sz32, test_mask.getBase(), min, max-min,
tmp.getBase());
if(DEBUG)
{
printf("freeing [ %d %d ]", min, max);
printf("- mask: ");
print(tmp.getBase(), max - min);
printf(" save: ");
size_t k;
Alloc& a = alloc_list[j];
for(k = 0; k<a.data.size(); k++)
printf("%.8x ", a.data[k]);
printf("\n");
}
int bytes = (max - min + 7) >> 3;
if(!cmp(tmp.getBase(), alloc_list[j].data.getBase(), max - min))
{
abort();
}
while(min < max)
BitmaskImpl::clear(sz32, alloc_mask.getBase(), min++);
alloc_list.erase(j);
}
else
{
Vector<Uint32> tmp;
tmp.fill(sz32, zero);
// Bit was free
// 1) Check how much space is avaiable
// 2) Create new allocation of lrandom size
// 3) Fill data with lrandom data
// 4) Update alloc mask
while(pos+free < bitmask_size &&
!BitmaskImpl::get(sz32, alloc_mask.getBase(), pos+free))
free++;
Uint32 sz =
(free <= 64 && ((lrand() % 100) > 80)) ? free : (lrand() % free);
sz = sz ? sz : 1;
sz = pos + sz == bitmask_size ? sz - 1 : sz;
Alloc a;
a.pos = pos;
a.size = sz;
a.data.fill(((sz+31)>> 5)-1, zero);
if(DEBUG)
printf("pos %d -> alloc [ %d %d ]", pos, pos, pos+sz);
for(size_t j = 0; j<sz; j++)
{
BitmaskImpl::set(sz32, alloc_mask.getBase(), pos+j);
if((lrand() % 1000) > 500)
BitmaskImpl::set((sz + 31) >> 5, a.data.getBase(), j);
}
if(DEBUG)
{
printf("- mask: ");
print(a.data.getBase(), sz);
printf("\n");
}
BitmaskImpl::setField(sz32, test_mask.getBase(), pos, sz,
a.data.getBase());
alloc_list.push_back(a);
}
}
#endif
}
template class Vector<Alloc>;
template class Vector<Uint32>;
#endif
/* Bitmask testcase code moved from here to
* storage/ndb/test/ndbapi/testBitfield.cpp
* to get coverage from automated testing
*/
ndb/test/ndbapi/testBitfield.cpp
View file @ 88dc7e9d
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