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| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-08-02 21:15:34 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-08-06 17:03:19 +0200 |
| commit | 76167e5c5457aee8fba3edc5b8554183696fc94d (patch) | |
| tree | 7afed64567fa6774fdf259bebff459ea592f031c /arch | |
| parent | f49236ae424d499d02ee3ce35fb9130ddf95b03f (diff) | |
| download | linux-76167e5c5457aee8fba3edc5b8554183696fc94d.tar.bz2 | |
x86/kaslr: Replace strlen() with strnlen()
strnlen is safer in case the command line is not NUL-terminated.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200803011534.730645-2-nivedita@alum.mit.edu
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/boot/compressed/kaslr.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c index 735fcb2a8b7b..6d397435ccad 100644 --- a/arch/x86/boot/compressed/kaslr.c +++ b/arch/x86/boot/compressed/kaslr.c @@ -43,6 +43,10 @@ #define STATIC #include <linux/decompress/mm.h> +#define _SETUP +#include <asm/setup.h> /* For COMMAND_LINE_SIZE */ +#undef _SETUP + #ifdef CONFIG_X86_5LEVEL unsigned int __pgtable_l5_enabled; unsigned int pgdir_shift __ro_after_init = 39; @@ -278,7 +282,7 @@ static void handle_mem_options(void) if (!args) return; - len = strlen(args); + len = strnlen(args, COMMAND_LINE_SIZE-1); tmp_cmdline = malloc(len + 1); if (!tmp_cmdline) error("Failed to allocate space for tmp_cmdline"); @@ -425,7 +429,7 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size, cmd_line = get_cmd_line_ptr(); /* Calculate size of cmd_line. */ if (cmd_line) { - cmd_line_size = strlen((char *)cmd_line) + 1; + cmd_line_size = strnlen((char *)cmd_line, COMMAND_LINE_SIZE-1) + 1; mem_avoid[MEM_AVOID_CMDLINE].start = cmd_line; mem_avoid[MEM_AVOID_CMDLINE].size = cmd_line_size; add_identity_map(mem_avoid[MEM_AVOID_CMDLINE].start, |