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| author |   Arvind Sankar <nivedita@alum.mit.edu> | 2020-08-13 14:58:11 -0400 |
|---|---|---|
| committer |   Ard Biesheuvel <ardb@kernel.org> | 2020-08-20 11:18:58 +0200 |
| commit | 8a8a3237a78cbc0557f0eb16a89f16d616323e99 (patch) | |
| tree | 8d25241503b67b0abeede247d809ee2517c2004f | |
| parent | efi/libstub: Handle NULL cmdline (diff) | |
| download | linux-dev-8a8a3237a78cbc0557f0eb16a89f16d616323e99.tar.xz linux-dev-8a8a3237a78cbc0557f0eb16a89f16d616323e99.zip | |
efi/libstub: Handle unterminated cmdline
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>
| -rw-r--r-- | drivers/firmware/efi/libstub/efi-stub-helper.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index f53652a3a106..f735db55adc0 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -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; |