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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-01-11 13:47:49 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2016-02-24 17:57:28 +0300
commit48fcb2d0216103d15306caa4814e2381104df6d8 (patch)
tree05ca61f680ebe569281598487964deba302b555a /drivers/firmware
parent2ddbfc81eac84a299cb4747a8764bc43f23e9008 (diff)
downloadlinux-48fcb2d0216103d15306caa4814e2381104df6d8.tar.xz
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')
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c7
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;