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nios2: force the string buffer NULL-terminated 

strncpy() does not ensure NULL-termination when the input string
size equals to the destination buffer size COMMAND_LINE_SIZE.
Besides, grep under arch/ with 'boot_command_line' shows
no other arch-specific code uses strncpy() when copying
boot_command_line.

Use strlcpy() instead.

This issue is identified by a Coccinelle script.

Signed-off-by: Wang Xiayang <xywang.sjtu@sjtu.edu.cn>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
This commit is contained in:
Wang Xiayang 2019-09-20 14:55:47 +08:00 committed by Ley Foon Tan
parent 4d856f72c1
commit 91d99a724e
1 changed files with 3 additions and 3 deletions
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6
arch/nios2/kernel/setup.c
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@ -123,7 +123,7 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
dtb_passed = r6;
if (r7)
strncpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
strlcpy(cmdline_passed, (char *)r7, COMMAND_LINE_SIZE);
}
#endif
@ -131,10 +131,10 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
#ifndef CONFIG_CMDLINE_FORCE
if (cmdline_passed[0])
strncpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
strlcpy(boot_command_line, cmdline_passed, COMMAND_LINE_SIZE);
#ifdef CONFIG_NIOS2_CMDLINE_IGNORE_DTB
else
strncpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
#endif
#endif