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bootstrap-initrd

Linux initrd to bootstrap from a small binary seed git clone https://anongit.hacktivis.me/git/bootstrap-initrd.git/

0001-Use-static-buffer-for-default-sigfile-path.patch (1327B)

    

  1. From 2ae5ef7e311782bffb5c68b7aaceb98086352ece Mon Sep 17 00:00:00 2001
  2. From: "Haelwenn (lanodan) Monnier" <contact@hacktivis.me>
  3. Date: Sun, 5 Oct 2025 21:29:44 +0200
  4. Subject: [PATCH] Use static buffer for default sigfile path
  6. ---
  7.  main.c | 16 +++++++++++++---
  8.  1 file changed, 13 insertions(+), 3 deletions(-)
  10. diff --git a/main.c b/main.c
  11. index ebfdfb0..addbfb8 100644
  12. --- a/main.c
  13. +++ b/main.c
  14. @@ -26,11 +26,16 @@
  15.  #include <fcntl.h>
  16.  #include <unistd.h>
  17.  #include <inttypes.h>
  18. +#include <limits.h>
  19.  
  20.  #include "base64.h"
  21.  #include "edsign.h"
  22.  #include "ed25519.h"
  23.  
  24. +#ifndef PATH_MAX
  25. +#define PATH_MAX 4096
  26. +#endif
  27. +
  28.  struct pubkey {
  29.  	char pkalg[2];
  30.  	uint8_t fingerprint[8];
  31. @@ -409,14 +414,19 @@ int main(int argc, char **argv)
  32.  	}
  33.  
  34.  	if (!sigfile && msgfile) {
  35. -		char *buf = alloca(strlen(msgfile) + 5);
  36. -
  37.  		if (!strcmp(msgfile, "-")) {
  38.  			fprintf(stderr, "Need signature file when reading message from stdin\n");
  39.  			return 1;
  40.  		}
  41.  
  42. -		sprintf(buf, "%s.sig", msgfile);
  43. +		if ((strlen(msgfile) - 4) > PATH_MAX)
  44. +		{
  45. +			fprintf(stderr, "Need signature file when msgfile path is over %zd (PATH_MAX - 4)\n", (size_t)PATH_MAX);
  46. +			return 1;
  47. +		}
  48. +
  49. +		static char buf[PATH_MAX];
  50. +		snprintf(buf, PATH_MAX, "%s.sig", msgfile);
  51.  		sigfile = buf;
  52.  	}
  53.  
  55. base-commit: f1f65026a94137c91b5466b149ef3ea3f20091e9
  56. -- 
  57. 2.49.1