mirror of
https://github.com/X11Libre/xserver.git
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bb59d6895f
We make two glyphsets, GS1 and GS2, both with the same format depth. GS1 contains any glyph different from the others, let's call it U (unique). GS2 contains two glyphs with the same content, or at least sha1 hash. Let's call them A and B. We first register GS1 and GS2. GS1 has no problems, but before the fix, registering GS2 breaks accounting in `globalGlyphs`. Since there is no check for duplicate glyphs within a single set, we make two `GlyphNew` entries for A and B. Now in the loop at the end, we go over each entry and call `AddGlyph` and `FreeGlyph`: 1. AddGlyph(GS2, A, idA) inserts A into `globalGlyphs` 2. FreeGlyph(A) drops A's refcnt by one, but as it's being held in `globalGlyphs` it's kept alive. 3. AddGlyph(GS2, B, idB) finds A in `globalGlyphs` and reuses it instead of inserting B 4. FreeGlyph(B) drops B's refcnt by one (to zero), and B is freed. Before the fix, the lookup in `globalGlyphs` finds A's entry, and since it isn't a DeletedGlyph, it erroneously removes the `gr->glyph` pointing to `A` and decrements `tableEntries`. This results in `tableEntries` being off-by-one as `A` is still alive. Now, we free the glyphsets in a particular order. Freeing GS1 results in calling FreeGlyph(U), which will decrement U's refcnt to zero, and free U. This clears out the entry in `globalGlyphs` for U and decrements `tableEntries`, which due to the earlier error is now zero. When `FreeGlyphSet` sees this, it clears the `globalGlyphs` for that format depth. Now freeing A or GS2 (which transitively frees A) will try to check the `globalGlyphs` at that format depth, but because it was cleared out this crashes. The fix here is to change FreeGlyph to only free a glyph from `globalGlyphs` that is exactly the glyph being freed, so that FreeGlyph(B) doesn't touch `globalGlyphs` at all. This keeps a proper count in `tableEntries` and prevents `globalGlyphs[fdepth]` from being freed before A is freed. Closes: #1881 Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2264> (cherry picked from commit 81edc9caf557f7a44c5b308742814457de0eb6c0) (cherry picked from commit 716d876142280cd66bdcf000f81428dadd5d3937) Signed-off-by: Octavia Togami <octy@octyl.net>
694 lines
19 KiB
C
694 lines
19 KiB
C
/*
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*
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* Copyright © 2000 SuSE, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of SuSE not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. SuSE makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
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* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Keith Packard, SuSE, Inc.
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*/
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#include <dix-config.h>
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#include "dix/screenint_priv.h"
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#include "include/mipict.h"
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#include "include/misc.h"
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#include "os/bug_priv.h"
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#include "os/xsha1.h"
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#include "scrnintstr.h"
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#include "os.h"
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#include "regionstr.h"
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#include "validate.h"
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#include "windowstr.h"
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#include "input.h"
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#include "resource.h"
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#include "cursorstr.h"
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#include "dixstruct.h"
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#include "gcstruct.h"
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#include "servermd.h"
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#include "picturestr.h"
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#include "glyphstr_priv.h"
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/*
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* From Knuth -- a good choice for hash/rehash values is p, p-2 where
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* p and p-2 are both prime. These tables are sized to have an extra 10%
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* free to avoid exponential performance degradation as the hash table fills
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*/
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static GlyphHashSetRec glyphHashSets[] = {
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{32, 43, 41},
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{64, 73, 71},
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{128, 151, 149},
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{256, 283, 281},
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{512, 571, 569},
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{1024, 1153, 1151},
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{2048, 2269, 2267},
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{4096, 4519, 4517},
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{8192, 9013, 9011},
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{16384, 18043, 18041},
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{32768, 36109, 36107},
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{65536, 72091, 72089},
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{131072, 144409, 144407},
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{262144, 288361, 288359},
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{524288, 576883, 576881},
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{1048576, 1153459, 1153457},
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{2097152, 2307163, 2307161},
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{4194304, 4613893, 4613891},
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{8388608, 9227641, 9227639},
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{16777216, 18455029, 18455027},
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{33554432, 36911011, 36911009},
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{67108864, 73819861, 73819859},
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{134217728, 147639589, 147639587},
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{268435456, 295279081, 295279079},
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{536870912, 590559793, 590559791}
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};
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#define NGLYPHHASHSETS ARRAY_SIZE(glyphHashSets)
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static GlyphHashRec globalGlyphs[GlyphFormatNum];
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void
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GlyphUninit(ScreenPtr pScreen)
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{
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PictureScreenPtr ps = GetPictureScreen(pScreen);
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GlyphPtr glyph;
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int fdepth, i;
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for (fdepth = 0; fdepth < GlyphFormatNum; fdepth++) {
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if (!globalGlyphs[fdepth].hashSet)
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continue;
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for (i = 0; i < globalGlyphs[fdepth].hashSet->size; i++) {
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glyph = globalGlyphs[fdepth].table[i].glyph;
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if (glyph && glyph != DeletedGlyph) {
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if (GetGlyphPicture(glyph, pScreen)) {
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FreePicture((void *) GetGlyphPicture(glyph, pScreen), 0);
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SetGlyphPicture(glyph, pScreen, NULL);
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}
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(*ps->UnrealizeGlyph) (pScreen, glyph);
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}
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}
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}
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}
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static GlyphHashSetPtr
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FindGlyphHashSet(CARD32 filled)
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{
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int i;
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for (i = 0; i < NGLYPHHASHSETS; i++)
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if (glyphHashSets[i].entries >= filled)
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return &glyphHashSets[i];
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return 0;
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}
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static GlyphRefPtr
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FindGlyphRef(GlyphHashPtr hash,
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CARD32 signature, Bool match, unsigned char sha1[20])
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{
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CARD32 elt, step, s;
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GlyphPtr glyph;
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GlyphRefPtr table, gr, del;
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if ((hash == NULL) || (hash->hashSet == NULL))
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return NULL;
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CARD32 tableSize = hash->hashSet->size;
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table = hash->table;
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elt = signature % tableSize;
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step = 0;
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del = 0;
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for (;;) {
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gr = &table[elt];
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s = gr->signature;
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glyph = gr->glyph;
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if (!glyph) {
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if (del)
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gr = del;
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break;
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}
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if (glyph == DeletedGlyph) {
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if (!del)
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del = gr;
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else if (gr == del)
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break;
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}
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else if (s == signature &&
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(!match || memcmp(glyph->sha1, sha1, 20) == 0)) {
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break;
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}
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if (!step) {
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step = signature % hash->hashSet->rehash;
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if (!step)
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step = 1;
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}
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elt += step;
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if (elt >= tableSize)
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elt -= tableSize;
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}
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return gr;
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}
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int
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HashGlyph(xGlyphInfo * gi,
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CARD8 *bits, unsigned long size, unsigned char sha1[20])
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{
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void *ctx = x_sha1_init();
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int success;
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if (!ctx)
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return BadAlloc;
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success = x_sha1_update(ctx, gi, sizeof(xGlyphInfo));
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if (!success)
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return BadAlloc;
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success = x_sha1_update(ctx, bits, size);
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if (!success)
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return BadAlloc;
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success = x_sha1_final(ctx, sha1);
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if (!success)
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return BadAlloc;
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return Success;
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}
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GlyphPtr
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FindGlyphByHash(unsigned char sha1[20], int format)
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{
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GlyphRefPtr gr;
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CARD32 signature = *(CARD32 *) sha1;
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if (!globalGlyphs[format].hashSet)
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return NULL;
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gr = FindGlyphRef(&globalGlyphs[format], signature, TRUE, sha1);
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if (gr->glyph && gr->glyph != DeletedGlyph)
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return gr->glyph;
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else
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return NULL;
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}
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#ifdef CHECK_DUPLICATES
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void
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DuplicateRef(GlyphPtr glyph, char *where)
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{
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ErrorF("Duplicate Glyph 0x%x from %s\n", glyph, where);
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}
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void
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CheckDuplicates(GlyphHashPtr hash, char *where)
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{
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GlyphPtr g;
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int i, j;
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for (i = 0; i < hash->hashSet->size; i++) {
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g = hash->table[i].glyph;
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if (!g || g == DeletedGlyph)
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continue;
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for (j = i + 1; j < hash->hashSet->size; j++)
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if (hash->table[j].glyph == g)
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DuplicateRef(g, where);
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}
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}
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#else
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#define CheckDuplicates(a,b)
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#define DuplicateRef(a,b)
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#endif
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static void
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FreeGlyphPicture(GlyphPtr glyph)
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{
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DIX_FOR_EACH_SCREEN({
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if (GetGlyphPicture(glyph, walkScreen))
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FreePicture((void *) GetGlyphPicture(glyph, walkScreen), 0);
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PictureScreenPtr ps = GetPictureScreenIfSet(walkScreen);
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if (ps)
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(*ps->UnrealizeGlyph) (walkScreen, glyph);
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});
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}
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void
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FreeGlyph(GlyphPtr glyph, int format)
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{
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CheckDuplicates(&globalGlyphs[format], "FreeGlyph");
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BUG_RETURN(glyph->refcnt == 0);
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if (--glyph->refcnt == 0) {
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GlyphRefPtr gr;
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int i;
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int first;
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CARD32 signature;
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first = -1;
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for (i = 0; i < globalGlyphs[format].hashSet->size; i++)
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if (globalGlyphs[format].table[i].glyph == glyph) {
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if (first != -1)
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DuplicateRef(glyph, "FreeGlyph check");
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first = i;
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}
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signature = *(CARD32 *) glyph->sha1;
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gr = FindGlyphRef(&globalGlyphs[format], signature, TRUE, glyph->sha1);
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if (gr - globalGlyphs[format].table != first)
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DuplicateRef(glyph, "Found wrong one");
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if (gr && gr->glyph == glyph) {
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gr->glyph = DeletedGlyph;
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gr->signature = 0;
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globalGlyphs[format].tableEntries--;
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}
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FreeGlyphPicture(glyph);
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dixFreeObjectWithPrivates(glyph, PRIVATE_GLYPH);
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}
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}
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void
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AddGlyph(GlyphSetPtr glyphSet, GlyphPtr glyph, Glyph id)
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{
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GlyphRefPtr gr;
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CARD32 signature;
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CheckDuplicates(&globalGlyphs[glyphSet->fdepth], "AddGlyph top global");
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/* Locate existing matching glyph */
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signature = *(CARD32 *) glyph->sha1;
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gr = FindGlyphRef(&globalGlyphs[glyphSet->fdepth], signature,
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TRUE, glyph->sha1);
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if (gr->glyph && gr->glyph != DeletedGlyph && gr->glyph != glyph) {
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glyph = gr->glyph;
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}
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else if (gr->glyph != glyph) {
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gr->glyph = glyph;
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gr->signature = signature;
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globalGlyphs[glyphSet->fdepth].tableEntries++;
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}
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/* Insert/replace glyphset value */
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gr = FindGlyphRef(&glyphSet->hash, id, FALSE, 0);
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++glyph->refcnt;
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if (gr->glyph && gr->glyph != DeletedGlyph)
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FreeGlyph(gr->glyph, glyphSet->fdepth);
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else
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glyphSet->hash.tableEntries++;
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gr->glyph = glyph;
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gr->signature = id;
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CheckDuplicates(&globalGlyphs[glyphSet->fdepth], "AddGlyph bottom");
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}
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Bool
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DeleteGlyph(GlyphSetPtr glyphSet, Glyph id)
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{
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GlyphRefPtr gr;
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GlyphPtr glyph;
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gr = FindGlyphRef(&glyphSet->hash, id, FALSE, 0);
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glyph = gr->glyph;
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if (glyph && glyph != DeletedGlyph) {
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gr->glyph = DeletedGlyph;
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glyphSet->hash.tableEntries--;
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FreeGlyph(glyph, glyphSet->fdepth);
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return TRUE;
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}
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return FALSE;
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}
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GlyphPtr
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FindGlyph(GlyphSetPtr glyphSet, Glyph id)
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{
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GlyphPtr glyph;
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glyph = FindGlyphRef(&glyphSet->hash, id, FALSE, 0)->glyph;
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if (glyph == DeletedGlyph)
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glyph = 0;
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return glyph;
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}
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GlyphPtr
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AllocateGlyph(xGlyphInfo * gi, int fdepth)
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{
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int size;
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int head_size;
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head_size = sizeof(GlyphRec) + screenInfo.numScreens * sizeof(PicturePtr);
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size = (head_size + dixPrivatesSize(PRIVATE_GLYPH));
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GlyphPtr glyph = calloc(1, size);
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if (!glyph)
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return 0;
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glyph->refcnt = 1;
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glyph->size = size + sizeof(xGlyphInfo);
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glyph->info = *gi;
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dixInitPrivates(glyph, (char *) glyph + head_size, PRIVATE_GLYPH);
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unsigned int i = 0;
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DIX_FOR_EACH_SCREEN({
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SetGlyphPicture(glyph, walkScreen, NULL);
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PictureScreenPtr ps = GetPictureScreenIfSet(walkScreen);
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if (ps) {
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if (!(ps->RealizeGlyph(walkScreen, glyph))) {
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i = walkScreenIdx;
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goto bail;
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}
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}
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});
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return glyph;
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bail:
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while (i--) {
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ScreenPtr walkScreen = dixGetScreenPtr(i);
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PictureScreenPtr ps = GetPictureScreenIfSet(walkScreen);
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if (ps)
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ps->UnrealizeGlyph(walkScreen, glyph);
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}
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dixFreeObjectWithPrivates(glyph, PRIVATE_GLYPH);
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return 0;
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}
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static Bool
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AllocateGlyphHash(GlyphHashPtr hash, GlyphHashSetPtr hashSet)
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{
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if (hashSet == NULL)
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return FALSE;
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hash->table = calloc(hashSet->size, sizeof(GlyphRefRec));
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if (!hash->table)
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return FALSE;
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hash->hashSet = hashSet;
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hash->tableEntries = 0;
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return TRUE;
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}
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static Bool
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ResizeGlyphHash(GlyphHashPtr hash, CARD32 change, Bool global)
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{
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CARD32 tableEntries;
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GlyphHashSetPtr hashSet;
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GlyphHashRec newHash;
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GlyphRefPtr gr;
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GlyphPtr glyph;
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int i;
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int oldSize;
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CARD32 s;
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tableEntries = hash->tableEntries + change;
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hashSet = FindGlyphHashSet(tableEntries);
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if (hashSet == hash->hashSet)
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return TRUE;
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if (global)
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CheckDuplicates(hash, "ResizeGlyphHash top");
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if (!AllocateGlyphHash(&newHash, hashSet))
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return FALSE;
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if (hash->table) {
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oldSize = hash->hashSet->size;
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for (i = 0; i < oldSize; i++) {
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glyph = hash->table[i].glyph;
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if (glyph && glyph != DeletedGlyph) {
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s = hash->table[i].signature;
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if ((gr = FindGlyphRef(&newHash, s, global, glyph->sha1))) {
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gr->signature = s;
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gr->glyph = glyph;
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}
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++newHash.tableEntries;
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}
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}
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free(hash->table);
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}
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*hash = newHash;
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if (global)
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CheckDuplicates(hash, "ResizeGlyphHash bottom");
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return TRUE;
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}
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Bool
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ResizeGlyphSet(GlyphSetPtr glyphSet, CARD32 change)
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{
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return (ResizeGlyphHash(&glyphSet->hash, change, FALSE) &&
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ResizeGlyphHash(&globalGlyphs[glyphSet->fdepth], change, TRUE));
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}
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GlyphSetPtr
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AllocateGlyphSet(int fdepth, PictFormatPtr format)
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{
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GlyphSetPtr glyphSet;
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if (!globalGlyphs[fdepth].hashSet) {
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if (!AllocateGlyphHash(&globalGlyphs[fdepth], &glyphHashSets[0]))
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return FALSE;
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}
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glyphSet = dixAllocateObjectWithPrivates(GlyphSetRec, PRIVATE_GLYPHSET);
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if (!glyphSet)
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return FALSE;
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if (!AllocateGlyphHash(&glyphSet->hash, &glyphHashSets[0])) {
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free(glyphSet);
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return FALSE;
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}
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glyphSet->refcnt = 1;
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glyphSet->fdepth = fdepth;
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glyphSet->format = format;
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return glyphSet;
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}
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int
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FreeGlyphSet(void *value, XID gid)
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{
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GlyphSetPtr glyphSet = (GlyphSetPtr) value;
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if (--glyphSet->refcnt == 0) {
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CARD32 i, tableSize = glyphSet->hash.hashSet->size;
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GlyphRefPtr table = glyphSet->hash.table;
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GlyphPtr glyph;
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for (i = 0; i < tableSize; i++) {
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glyph = table[i].glyph;
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if (glyph && glyph != DeletedGlyph)
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FreeGlyph(glyph, glyphSet->fdepth);
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}
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if (!globalGlyphs[glyphSet->fdepth].tableEntries) {
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free(globalGlyphs[glyphSet->fdepth].table);
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globalGlyphs[glyphSet->fdepth].table = 0;
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globalGlyphs[glyphSet->fdepth].hashSet = 0;
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}
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else
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ResizeGlyphHash(&globalGlyphs[glyphSet->fdepth], 0, TRUE);
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free(table);
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dixFreeObjectWithPrivates(glyphSet, PRIVATE_GLYPHSET);
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}
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return Success;
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}
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static void
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GlyphExtents(int nlist, GlyphListPtr list, GlyphPtr * glyphs, BoxPtr extents)
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{
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int x1, x2, y1, y2;
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int n;
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GlyphPtr glyph;
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int x, y;
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x = 0;
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y = 0;
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extents->x1 = MAXSHORT;
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extents->x2 = MINSHORT;
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extents->y1 = MAXSHORT;
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extents->y2 = MINSHORT;
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while (nlist--) {
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x += list->xOff;
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y += list->yOff;
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n = list->len;
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list++;
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while (n--) {
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glyph = *glyphs++;
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x1 = x - glyph->info.x;
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if (x1 < MINSHORT)
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x1 = MINSHORT;
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y1 = y - glyph->info.y;
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if (y1 < MINSHORT)
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y1 = MINSHORT;
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x2 = x1 + glyph->info.width;
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if (x2 > MAXSHORT)
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x2 = MAXSHORT;
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y2 = y1 + glyph->info.height;
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if (y2 > MAXSHORT)
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y2 = MAXSHORT;
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if (x1 < extents->x1)
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extents->x1 = x1;
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if (x2 > extents->x2)
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extents->x2 = x2;
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if (y1 < extents->y1)
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extents->y1 = y1;
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if (y2 > extents->y2)
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extents->y2 = y2;
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x += glyph->info.xOff;
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y += glyph->info.yOff;
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}
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}
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}
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#define NeedsComponent(f) (PIXMAN_FORMAT_A((f)) != 0 && PIXMAN_FORMAT_RGB((f)) != 0)
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void
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CompositeGlyphs(CARD8 op,
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PicturePtr pSrc,
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PicturePtr pDst,
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PictFormatPtr maskFormat,
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INT16 xSrc,
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INT16 ySrc, int nlist, GlyphListPtr lists, GlyphPtr * glyphs)
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{
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PictureScreenPtr ps = GetPictureScreen(pDst->pDrawable->pScreen);
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ValidatePicture(pSrc);
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ValidatePicture(pDst);
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(*ps->Glyphs) (op, pSrc, pDst, maskFormat, xSrc, ySrc, nlist, lists,
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glyphs);
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}
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Bool
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miRealizeGlyph(ScreenPtr pScreen, GlyphPtr glyph)
|
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{
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return TRUE;
|
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}
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|
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void
|
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miUnrealizeGlyph(ScreenPtr pScreen, GlyphPtr glyph)
|
|
{
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}
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|
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void
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miGlyphs(CARD8 op,
|
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PicturePtr pSrc,
|
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PicturePtr pDst,
|
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PictFormatPtr maskFormat,
|
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INT16 xSrc,
|
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INT16 ySrc, int nlist, GlyphListPtr list, GlyphPtr * glyphs)
|
|
{
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PicturePtr pPicture;
|
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PixmapPtr pMaskPixmap = 0;
|
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PicturePtr pMask;
|
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ScreenPtr pScreen = pDst->pDrawable->pScreen;
|
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int width = 0, height = 0;
|
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int x, y;
|
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int xDst = list->xOff, yDst = list->yOff;
|
|
int n;
|
|
GlyphPtr glyph;
|
|
int error;
|
|
BoxRec extents = { 0, 0, 0, 0 };
|
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CARD32 component_alpha;
|
|
|
|
if (maskFormat) {
|
|
GCPtr pGC;
|
|
xRectangle rect;
|
|
|
|
GlyphExtents(nlist, list, glyphs, &extents);
|
|
|
|
if (extents.x2 <= extents.x1 || extents.y2 <= extents.y1)
|
|
return;
|
|
width = extents.x2 - extents.x1;
|
|
height = extents.y2 - extents.y1;
|
|
pMaskPixmap = (*pScreen->CreatePixmap) (pScreen, width, height,
|
|
maskFormat->depth,
|
|
CREATE_PIXMAP_USAGE_SCRATCH);
|
|
if (!pMaskPixmap)
|
|
return;
|
|
component_alpha = NeedsComponent(maskFormat->format);
|
|
pMask = CreatePicture(0, &pMaskPixmap->drawable,
|
|
maskFormat, CPComponentAlpha, &component_alpha,
|
|
serverClient, &error);
|
|
if (!pMask) {
|
|
dixDestroyPixmap(pMaskPixmap, 0);
|
|
return;
|
|
}
|
|
pGC = GetScratchGC(pMaskPixmap->drawable.depth, pScreen);
|
|
ValidateGC(&pMaskPixmap->drawable, pGC);
|
|
rect.x = 0;
|
|
rect.y = 0;
|
|
rect.width = width;
|
|
rect.height = height;
|
|
(*pGC->ops->PolyFillRect) (&pMaskPixmap->drawable, pGC, 1, &rect);
|
|
FreeScratchGC(pGC);
|
|
x = -extents.x1;
|
|
y = -extents.y1;
|
|
}
|
|
else {
|
|
pMask = pDst;
|
|
x = 0;
|
|
y = 0;
|
|
}
|
|
while (nlist--) {
|
|
x += list->xOff;
|
|
y += list->yOff;
|
|
n = list->len;
|
|
while (n--) {
|
|
glyph = *glyphs++;
|
|
pPicture = GetGlyphPicture(glyph, pScreen);
|
|
|
|
if (pPicture) {
|
|
if (maskFormat) {
|
|
CompositePicture(PictOpAdd,
|
|
pPicture,
|
|
None,
|
|
pMask,
|
|
0, 0,
|
|
0, 0,
|
|
x - glyph->info.x,
|
|
y - glyph->info.y,
|
|
glyph->info.width, glyph->info.height);
|
|
}
|
|
else {
|
|
CompositePicture(op,
|
|
pSrc,
|
|
pPicture,
|
|
pDst,
|
|
xSrc + (x - glyph->info.x) - xDst,
|
|
ySrc + (y - glyph->info.y) - yDst,
|
|
0, 0,
|
|
x - glyph->info.x,
|
|
y - glyph->info.y,
|
|
glyph->info.width, glyph->info.height);
|
|
}
|
|
}
|
|
|
|
x += glyph->info.xOff;
|
|
y += glyph->info.yOff;
|
|
}
|
|
list++;
|
|
}
|
|
if (maskFormat) {
|
|
x = extents.x1;
|
|
y = extents.y1;
|
|
CompositePicture(op,
|
|
pSrc,
|
|
pMask,
|
|
pDst,
|
|
xSrc + x - xDst,
|
|
ySrc + y - yDst, 0, 0, x, y, width, height);
|
|
FreePicture((void *) pMask, (XID) 0);
|
|
dixDestroyPixmap(pMaskPixmap, 0);
|
|
}
|
|
}
|
|
|
|
PicturePtr GetGlyphPicture(GlyphPtr glyph, ScreenPtr pScreen)
|
|
{
|
|
if (pScreen->isGPU)
|
|
return NULL;
|
|
return GlyphPicture(glyph)[pScreen->myNum];
|
|
}
|
|
|
|
void SetGlyphPicture(GlyphPtr glyph, ScreenPtr pScreen, PicturePtr picture)
|
|
{
|
|
GlyphPicture(glyph)[pScreen->myNum] = picture;
|
|
}
|