diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-boot-Add-early-cmdline-parsing-for-options-with-.patch')
-rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-boot-Add-early-cmdline-parsing-for-options-with-.patch | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-boot-Add-early-cmdline-parsing-for-options-with-.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-boot-Add-early-cmdline-parsing-for-options-with-.patch new file mode 100644 index 00000000..cca9a97c --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0001-x86-boot-Add-early-cmdline-parsing-for-options-with-.patch @@ -0,0 +1,183 @@ +From c1a85d38da405ddd17f7f5255a36405bf3414e60 Mon Sep 17 00:00:00 2001 +From: Tom Lendacky <thomas.lendacky@amd.com> +Date: Mon, 17 Jul 2017 16:10:33 -0500 +Subject: [PATCH 001/102] x86/boot: Add early cmdline parsing for options with + arguments +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +commit e505371dd83963caae1a37ead9524e8d997341be upstream. + +Add a cmdline_find_option() function to look for cmdline options that +take arguments. The argument is returned in a supplied buffer and the +argument length (regardless of whether it fits in the supplied buffer) +is returned, with -1 indicating not found. + +Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> +Reviewed-by: Thomas Gleixner <tglx@linutronix.de> +Cc: Alexander Potapenko <glider@google.com> +Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> +Cc: Andy Lutomirski <luto@kernel.org> +Cc: Arnd Bergmann <arnd@arndb.de> +Cc: Borislav Petkov <bp@alien8.de> +Cc: Brijesh Singh <brijesh.singh@amd.com> +Cc: Dave Young <dyoung@redhat.com> +Cc: Dmitry Vyukov <dvyukov@google.com> +Cc: Jonathan Corbet <corbet@lwn.net> +Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> +Cc: Larry Woodman <lwoodman@redhat.com> +Cc: Linus Torvalds <torvalds@linux-foundation.org> +Cc: Matt Fleming <matt@codeblueprint.co.uk> +Cc: Michael S. Tsirkin <mst@redhat.com> +Cc: Paolo Bonzini <pbonzini@redhat.com> +Cc: Peter Zijlstra <peterz@infradead.org> +Cc: Radim Krčmář <rkrcmar@redhat.com> +Cc: Rik van Riel <riel@redhat.com> +Cc: Toshimitsu Kani <toshi.kani@hpe.com> +Cc: kasan-dev@googlegroups.com +Cc: kvm@vger.kernel.org +Cc: linux-arch@vger.kernel.org +Cc: linux-doc@vger.kernel.org +Cc: linux-efi@vger.kernel.org +Cc: linux-mm@kvack.org +Link: http://lkml.kernel.org/r/36b5f97492a9745dce27682305f990fc20e5cf8a.1500319216.git.thomas.lendacky@amd.com +Signed-off-by: Ingo Molnar <mingo@kernel.org> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/include/asm/cmdline.h | 2 + + arch/x86/lib/cmdline.c | 105 +++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 107 insertions(+) + +diff --git a/arch/x86/include/asm/cmdline.h b/arch/x86/include/asm/cmdline.h +index e01f7f7..84ae170 100644 +--- a/arch/x86/include/asm/cmdline.h ++++ b/arch/x86/include/asm/cmdline.h +@@ -2,5 +2,7 @@ + #define _ASM_X86_CMDLINE_H + + int cmdline_find_option_bool(const char *cmdline_ptr, const char *option); ++int cmdline_find_option(const char *cmdline_ptr, const char *option, ++ char *buffer, int bufsize); + + #endif /* _ASM_X86_CMDLINE_H */ +diff --git a/arch/x86/lib/cmdline.c b/arch/x86/lib/cmdline.c +index 5cc78bf..3261abb 100644 +--- a/arch/x86/lib/cmdline.c ++++ b/arch/x86/lib/cmdline.c +@@ -104,7 +104,112 @@ __cmdline_find_option_bool(const char *cmdline, int max_cmdline_size, + return 0; /* Buffer overrun */ + } + ++/* ++ * Find a non-boolean option (i.e. option=argument). In accordance with ++ * standard Linux practice, if this option is repeated, this returns the ++ * last instance on the command line. ++ * ++ * @cmdline: the cmdline string ++ * @max_cmdline_size: the maximum size of cmdline ++ * @option: option string to look for ++ * @buffer: memory buffer to return the option argument ++ * @bufsize: size of the supplied memory buffer ++ * ++ * Returns the length of the argument (regardless of if it was ++ * truncated to fit in the buffer), or -1 on not found. ++ */ ++static int ++__cmdline_find_option(const char *cmdline, int max_cmdline_size, ++ const char *option, char *buffer, int bufsize) ++{ ++ char c; ++ int pos = 0, len = -1; ++ const char *opptr = NULL; ++ char *bufptr = buffer; ++ enum { ++ st_wordstart = 0, /* Start of word/after whitespace */ ++ st_wordcmp, /* Comparing this word */ ++ st_wordskip, /* Miscompare, skip */ ++ st_bufcpy, /* Copying this to buffer */ ++ } state = st_wordstart; ++ ++ if (!cmdline) ++ return -1; /* No command line */ ++ ++ /* ++ * This 'pos' check ensures we do not overrun ++ * a non-NULL-terminated 'cmdline' ++ */ ++ while (pos++ < max_cmdline_size) { ++ c = *(char *)cmdline++; ++ if (!c) ++ break; ++ ++ switch (state) { ++ case st_wordstart: ++ if (myisspace(c)) ++ break; ++ ++ state = st_wordcmp; ++ opptr = option; ++ /* fall through */ ++ ++ case st_wordcmp: ++ if ((c == '=') && !*opptr) { ++ /* ++ * We matched all the way to the end of the ++ * option we were looking for, prepare to ++ * copy the argument. ++ */ ++ len = 0; ++ bufptr = buffer; ++ state = st_bufcpy; ++ break; ++ } else if (c == *opptr++) { ++ /* ++ * We are currently matching, so continue ++ * to the next character on the cmdline. ++ */ ++ break; ++ } ++ state = st_wordskip; ++ /* fall through */ ++ ++ case st_wordskip: ++ if (myisspace(c)) ++ state = st_wordstart; ++ break; ++ ++ case st_bufcpy: ++ if (myisspace(c)) { ++ state = st_wordstart; ++ } else { ++ /* ++ * Increment len, but don't overrun the ++ * supplied buffer and leave room for the ++ * NULL terminator. ++ */ ++ if (++len < bufsize) ++ *bufptr++ = c; ++ } ++ break; ++ } ++ } ++ ++ if (bufsize) ++ *bufptr = '\0'; ++ ++ return len; ++} ++ + int cmdline_find_option_bool(const char *cmdline, const char *option) + { + return __cmdline_find_option_bool(cmdline, COMMAND_LINE_SIZE, option); + } ++ ++int cmdline_find_option(const char *cmdline, const char *option, char *buffer, ++ int bufsize) ++{ ++ return __cmdline_find_option(cmdline, COMMAND_LINE_SIZE, option, ++ buffer, bufsize); ++} +-- +2.7.4 + |