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efi/libstub: Handle unterminated cmdline

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Make the command line parsing more robust, by handling the case it is
not NUL-terminated.

Use strnlen instead of strlen, and make sure that the temporary copy is
NUL-terminated before parsing.

Cc: <stable@vger.kernel.org>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200813185811.554051-4-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Arvind Sankar 2020-08-13 14:58:11 -04:00 committed by Ard Biesheuvel
parent a37ca6a2af
commit 8a8a3237a7
1 changed files with 4 additions and 2 deletions
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6
drivers/firmware/efi/libstub/efi-stub-helper.c
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@ -194,12 +194,14 @@ efi_status_t efi_parse_options(char const *cmdline)
if (!cmdline)
return EFI_SUCCESS;
len = strlen(cmdline) + 1;
len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf);
if (status != EFI_SUCCESS)
return status;
str = skip_spaces(memcpy(buf, cmdline, len));
memcpy(buf, cmdline, len - 1);
buf[len - 1] = '\0';
str = skip_spaces(buf);
while (*str) {
char *param, *val;