linux-kernel - Re: [PATCH 2/2] Only print "Decompressing Linux" etc when 'noisy' is passed.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 24 May 2008 21:28:21 +0200
From:	devzero@....de
To:	krh@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Only print "Decompressing Linux" etc when 'noisy' is passed.

what about using "quiet" here instead ?

quiet is already the parameter to suppress boot messages, so introducing another one doesn`t make sense, imho.

the early boot commandline parser was extended some time ago to support boolean options, see:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=32d0b9898029b7b3c7f161d31f57c4831d9049eb

this may shrink your patch , see example in arch/x86/boot/edd.c 


be_quiet = cmdline_find_option_bool("quiet");
....
if (!be_quiet)
    printf("Probing EDD (edd=off to disable)... ");


roland



List:       linux-kernel
Subject:    [PATCH 2/2] Only print "Decompressing Linux" etc when 'noisy' is passed.
From:       Kristian HÃ&#382;gsberg <krh () redhat ! com>
Date:       2008-05-23 21:59:28
Message-ID: 1211579968-15227-2-git-send-email-krh () redhat ! com
[Download message RAW]

Signed-off-by: Kristian HÃ&#382;gsberg <krh@...hat.com>
---
 arch/x86/boot/compressed/misc.c |   30 +++++++++++++++++++++++++++---
 1 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 0d03579..b7b5c1f 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -190,6 +190,7 @@ static void gzip_release(void **);
  */
 static struct boot_params *real_mode;          /* Pointer to real-mode data */
 static struct screen_info *rm_screen_info;     /* Pointer to real-mode data */
+static int noisy;
 
 extern unsigned char input_data[];
 extern int input_len;
@@ -391,7 +392,8 @@ static void parse_elf(void *output)
                return;
        }
 
-       putstr("Parsing ELF... ");
+       if (noisy)
+               putstr("Parsing ELF... ");
 
        phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
        if (!phdrs)
@@ -419,11 +421,27 @@ static void parse_elf(void *output)
        }
 }
 
+static const char *strnstr(const char *string, int len, const char *s)
+{
+       int i, j;
+
+       for (i = 0; i < len; i++) {
+               for (j = 0; i + j < len && s[j]; j++)
+                       if (string[i + j] != s[j])
+                               break;
+               if (s[j] == '\0')
+                       return string + i;
+       }
+
+       return NULL;
+}
 asmlinkage void decompress_kernel(void *rmode, memptr heap,
                                  unsigned char *input_data,
                                  unsigned long input_len,
                                  unsigned char *output)
 {
+       char *cmdline;
+
        real_mode = rmode;
 
        if (rm_screen_info->orig_video_mode == 7) {
@@ -437,6 +455,10 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
        lines = rm_screen_info->orig_video_lines;
        cols = rm_screen_info->orig_video_cols;
 
+       cmdline = (char *) real_mode->hdr.cmd_line_ptr;
+       if (strnstr(cmdline, real_mode->hdr.cmdline_size, "noisy"))
+               noisy = 1;
+
        window = output;                /* Output buffer (Normally at 1M) */
        free_mem_ptr     = heap;        /* Heap */
        free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
@@ -461,9 +483,11 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 #endif
 
        makecrc();
-       putstr("\nDecompressing Linux... ");
+       if (noisy)
+               putstr("\nDecompressing Linux... ");
        gunzip();
        parse_elf(output);
-       putstr("done.\nBooting the kernel.\n");
+       if (noisy)
+               putstr("done.\nBooting the kernel.\n");
        return;
 }
-- 
1.5.5.1
_______________________________________________________________________
EINE FÜR ALLE: die kostenlose WEB.DE-Plattform für Freunde und Deine
Homepage mit eigenem Namen. Jetzt starten! http://unddu.de/?kid=kid@mf2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/