62368bda90
proc: update or inserted cmdline-flags required for proper SafetyNet-support proc: cmdline: set warranty bit-flags to 0 proc: cmdline: fix invalid handling of value-changing Change-Id: Idec862bcf9125a79ac9505a938495f114636b4fc
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/setup.h>
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static char updated_command_line[COMMAND_LINE_SIZE];
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static int cmdline_proc_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "%s\n", updated_command_line);
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return 0;
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}
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static int cmdline_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, cmdline_proc_show, NULL);
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}
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static const struct file_operations cmdline_proc_fops = {
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.open = cmdline_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void proc_cmdline_set(char *name, char *value)
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{
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char flag_str[COMMAND_LINE_SIZE];
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char *flag_substr;
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char *flag_space_substr;
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scnprintf(flag_str, COMMAND_LINE_SIZE, "%s=", name);
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flag_substr = strstr(updated_command_line, flag_str);
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if (flag_substr) {
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flag_space_substr = strchr(flag_substr, ' ');
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scnprintf(updated_command_line, COMMAND_LINE_SIZE, "%.*s%s", (int)(flag_substr - updated_command_line), updated_command_line, flag_space_substr + 1);
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}
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// flag was not found, insert it
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scnprintf(updated_command_line, COMMAND_LINE_SIZE, "%s %s=%s", updated_command_line, name, value);
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}
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static int __init proc_cmdline_init(void)
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{
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// copy it only once
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strcpy(updated_command_line, saved_command_line);
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proc_cmdline_set("androidboot.verifiedbootstate", "green");
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proc_cmdline_set("androidboot.warranty_bit", "0");
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proc_create("cmdline", 0, NULL, &cmdline_proc_fops);
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return 0;
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}
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fs_initcall(proc_cmdline_init);
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