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Fix most obvious intel-microcode2ucode buffer overruns.
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Index: microcode_ctl-2.1-19/intel-microcode2ucode.c
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===================================================================
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--- microcode_ctl-2.1-19.orig/intel-microcode2ucode.c 2018-08-20 04:32:26.803450076 +0200
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+++ microcode_ctl-2.1-19/intel-microcode2ucode.c 2018-08-20 04:33:49.324661025 +0200
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@@ -47,16 +47,25 @@
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char c[0];
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};
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+#define MAX_MICROCODE 4000000
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+
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int main(int argc, char *argv[])
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{
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char *filename = "/lib/firmware/microcode.dat";
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FILE *input, *f;
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char line[LINE_MAX];
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- char buf[4000000];
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+ char *buf = NULL;
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union mcbuf *mc;
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size_t bufsize, count, start;
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int rc = EXIT_SUCCESS;
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+ buf = malloc(MAX_MICROCODE);
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+ if (!buf) {
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+ printf("can't allocate buffer\n");
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+ rc = EXIT_FAILURE;
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+ goto out;
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+ }
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+
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if (argv[1] != NULL)
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filename = argv[1];
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@@ -74,6 +83,12 @@
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count = 0;
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mc = (union mcbuf *) buf;
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while (fgets(line, sizeof(line), input) != NULL) {
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+ if ((count + 3) >= (MAX_MICROCODE / sizeof(mc->i[0]))) {
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+ printf("input file is too big");
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+ rc = EXIT_FAILURE;
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+ goto out;
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+ }
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+
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if (sscanf(line, "%x, %x, %x, %x",
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&mc->i[count],
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&mc->i[count + 1],
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@@ -102,6 +117,10 @@
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unsigned int family, model, stepping;
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unsigned int year, month, day;
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+ if ((start > bufsize) ||
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+ ((bufsize - start) < sizeof(struct microcode_header_intel)))
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+ goto out;
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+
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mc = (union mcbuf *) &buf[start];
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if (mc->hdr.totalsize)
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@@ -109,8 +128,12 @@
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else
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size = 2000 + sizeof(struct microcode_header_intel);
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+ if (size > (bufsize - start))
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+ goto out;
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+
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if (mc->hdr.ldrver != 1 || mc->hdr.hdrver != 1) {
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- printf("unknown version/format:\n");
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+ printf("unknown version/format: %d/%d\n",
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+ mc->hdr.ldrver, mc->hdr.hdrver);
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rc = EXIT_FAILURE;
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break;
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}
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@@ -135,7 +158,11 @@
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month = mc->hdr.date >> 24;
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day = (mc->hdr.date >> 16) & 0xff;
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- asprintf(&filename, "intel-ucode/%02x-%02x-%02x", family, model, stepping);
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+ if (asprintf(&filename, "intel-ucode/%02x-%02x-%02x", family,
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+ model, stepping) == -1) {
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+ printf("Failed to generate ucode filename\n");
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+ goto out;
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+ }
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printf("\n");
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printf("%s\n", filename);
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printf("signature: 0x%02x\n", mc->hdr.sig);
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@@ -164,6 +191,11 @@
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}
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printf("\n");
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+ if (start != bufsize)
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+ printf("Finished parsing at byte %zu of %zu\n", start, bufsize);
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+
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out:
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+ free(buf);
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+
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return rc;
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}
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