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fix(kexec-fiwix): humm, not sure, harden initrd metadata checks and keep interrupts disabled before jump

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vxtls 2026-02-28 23:03:53 -05:00
parent 7f6be11622
commit 9db40954d2
1 changed files with 11 additions and 1 deletions
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12
steps/kexec-fiwix-1.0/src/kexec-fiwix.c
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@ -156,16 +156,26 @@ int main(int argc, char **argv) {
}
int filenum;
int found_image = 0;
unsigned int filename_addr;
for (filenum = 4, filename_addr = 0x201000; filenum <= 14335; filenum++, filename_addr += 1024) {
if (!strcmp((char *) filename_addr, initrd_filename)) {
printf("Found image at filenum %d\n", filenum);
found_image = 1;
break;
}
}
if (!found_image) {
printf("kexec-fiwix: initrd image not found in file table: %s\n", initrd_filename);
return EXIT_FAILURE;
}
unsigned int initrd_src = *((unsigned int *) (0x01000000 + (16 * filenum) + 4));
unsigned int initrd_len = *((unsigned int *) (0x01000000 + (16 * filenum) + 8));
if (initrd_src == 0 || initrd_len == 0) {
printf("kexec-fiwix: invalid initrd metadata src=0x%08x len=0x%08x\n", initrd_src, initrd_len);
return EXIT_FAILURE;
}
printf("initrd_src: 0x%08x\n", initrd_src);
printf("initrd_len: 0x%08x\n", initrd_len);
@ -260,7 +270,7 @@ int main(int argc, char **argv) {
0xF3, 0xA4, /* rep movsb */
0xB8, 0x00, 0x00, 0x00, 0x00, /* mov eax, 0x00000000 */
0xBB, 0x00, 0x00, 0x00, 0x00, /* mov ebx, 0x00000000 */
0xFB, /* sti */
0xFA, /* cli */
0xEA, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00 /* jmp far 0x0008:0x00000000 */
};