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The MemPage.aDataEnd field should point to the end of the data buffer for

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the page, not just the end of the usable portion of that buffer.  The purpose
aDataEnd is to detect cells that overflow the page, and that won't work on a
page with reserved bytes and a cell that starts in the reserved region, unless
the boundary is at the very end of the page. Chromium issue 1276294.

FossilOrigin-Name: f839c0bc8388a31f6db5081906b66b9e129855ba27a13cf13bd995b083f7386e
This commit is contained in:
drh 2022-03-01 20:15:04 +00:00
parent 3b4cb719c0
commit a055abb8c4
4 changed files with 13 additions and 11 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\sminor\stypo\sin\sa\scomment.
D 2022-03-01T19:19:20.084
C The\sMemPage.aDataEnd\sfield\sshould\spoint\sto\sthe\send\sof\sthe\sdata\sbuffer\sfor\nthe\spage,\snot\sjust\sthe\send\sof\sthe\susable\sportion\sof\sthat\sbuffer.\s\sThe\spurpose\naDataEnd\sis\sto\sdetect\scells\sthat\soverflow\sthe\spage,\sand\sthat\swon't\swork\son\sa\npage\swith\sreserved\sbytes\sand\sa\scell\sthat\sstarts\sin\sthe\sreserved\sregion,\sunless\nthe\sboundary\sis\sat\sthe\svery\send\sof\sthe\spage.\sChromium\sissue\s1276294.
D 2022-03-01T20:15:04.332
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -492,9 +492,9 @@ F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
F src/backup.c a2891172438e385fdbe97c11c9745676bec54f518d4447090af97189fd8e52d7
F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
F src/btree.c 7e9400d1582136ca86af9bbb07f8f3e933b284e969cda516bdc755285d137eb2
F src/btree.c 752fc154c07e03fd77a5426f6d625aa5aeeacd0054e0d5be9a89dd217d8b7f02
F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
F src/btreeInt.h 7282a6e77775f93a6eb78d3a41dab372a01a4ec1d93d3b4728d191d15fda42e2
F src/btreeInt.h 1ca477727c5f420a8321208dc5b14d93cb46cec8f941bc49318feb0e00bc961f
F src/build.c 9891c2160886cf7e344d7e8f1f7177f9612916c7c67ffeacd64cb34a92d387a8
F src/callback.c 4c19af69835787bfe790ac560f3071a824eb629f34e41f97b52ce5235c77de1c
F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
@ -1944,8 +1944,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 3b36ed79d82fae47a08a7d27f4fcefb7978fdf0e7f8c0f4a82f59501f201b32b
R 672415af5b93cf666a13cbb4e5190cf0
P 86ba06aa4c55d3aefe030b19b2b5c08baf46bbb2218b04ac1228ab76682a929b
R 759bdd2426153bccb0e084e1cc68e2b8
U drh
Z f44c78af05c98bc038cc5e60cffa1d77
Z c62f0605f7573e50ae4553081294f184
# Remove this line to create a well-formed Fossil manifest.

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@ -1 +1 @@
86ba06aa4c55d3aefe030b19b2b5c08baf46bbb2218b04ac1228ab76682a929b
f839c0bc8388a31f6db5081906b66b9e129855ba27a13cf13bd995b083f7386e

4
src/btree.c
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@ -2107,7 +2107,7 @@ static int btreeInitPage(MemPage *pPage){
pPage->nOverflow = 0;
pPage->cellOffset = pPage->hdrOffset + 8 + pPage->childPtrSize;
pPage->aCellIdx = data + pPage->childPtrSize + 8;
pPage->aDataEnd = pPage->aData + pBt->usableSize;
pPage->aDataEnd = pPage->aData + pBt->pageSize;
pPage->aDataOfst = pPage->aData + pPage->childPtrSize;
/* EVIDENCE-OF: R-37002-32774 The two-byte integer at offset 3 gives the
** number of cells on the page. */
@ -2158,7 +2158,7 @@ static void zeroPage(MemPage *pPage, int flags){
pPage->nFree = (u16)(pBt->usableSize - first);
decodeFlags(pPage, flags);
pPage->cellOffset = first;
pPage->aDataEnd = &data[pBt->usableSize];
pPage->aDataEnd = &data[pBt->pageSize];
pPage->aCellIdx = &data[first];
pPage->aDataOfst = &data[pPage->childPtrSize];
pPage->nOverflow = 0;

4
src/btreeInt.h
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@ -293,7 +293,9 @@ struct MemPage {
u8 *apOvfl[4]; /* Pointers to the body of overflow cells */
BtShared *pBt; /* Pointer to BtShared that this page is part of */
u8 *aData; /* Pointer to disk image of the page data */
u8 *aDataEnd; /* One byte past the end of usable data */
u8 *aDataEnd; /* One byte past the end of the entire page - not just
** the usable space, the entire page. Used to prevent
** corruption-induced of buffer overflow. */
u8 *aCellIdx; /* The cell index area */
u8 *aDataOfst; /* Same as aData for leaves. aData+4 for interior */
DbPage *pDbPage; /* Pager page handle */