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| author |   Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-01-11 11:47:49 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2016-02-24 14:57:28 +0000 |
| commit | 48fcb2d0216103d15306caa4814e2381104df6d8 (patch) | |
| tree | 05ca61f680ebe569281598487964deba302b555a /drivers/firmware/efi/libstub/efi-stub-helper.c | |
| parent | efi: stub: add implementation of efi_random_alloc() (diff) | |
| download | linux-dev-48fcb2d0216103d15306caa4814e2381104df6d8.tar.xz linux-dev-48fcb2d0216103d15306caa4814e2381104df6d8.zip | |
efi: stub: use high allocation for converted command line
Before we can move the command line processing before the allocation
of the kernel, which is required for detecting the 'nokaslr' option
which controls that allocation, move the converted command line higher
up in memory, to prevent it from interfering with the kernel itself.
Since x86 needs the address to fit in 32 bits, use UINT_MAX as the upper
bound there. Otherwise, use ULONG_MAX (i.e., no limit)
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/firmware/efi/libstub/efi-stub-helper.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/efi-stub-helper.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index f07d4a67fa76..29ed2f9b218c 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -649,6 +649,10 @@ static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) return dst; } +#ifndef MAX_CMDLINE_ADDRESS +#define MAX_CMDLINE_ADDRESS ULONG_MAX +#endif + /* * Convert the unicode UEFI command line to ASCII to pass to kernel. * Size of memory allocated return in *cmd_line_len. @@ -684,7 +688,8 @@ char *efi_convert_cmdline(efi_system_table_t *sys_table_arg, options_bytes++; /* NUL termination */ - status = efi_low_alloc(sys_table_arg, options_bytes, 0, &cmdline_addr); + status = efi_high_alloc(sys_table_arg, options_bytes, 0, + &cmdline_addr, MAX_CMDLINE_ADDRESS); if (status != EFI_SUCCESS) return NULL; |