elf: add remaining SHF_ flag macros

Add the remaining SHF_ flags, as listed in the "Executable and
Linkable Format" Wikipedia page and the System V Application Binary
Interface[1]. This allows drivers to load and parse ELF images that use
some of those flags.

In particular, an upcoming change to the Nouveau GPU driver will
use some of the flags.

Link: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.sheader.html#sh_flags [1]
Signed-off-by: Timur Tabi <ttabi@nvidia.com>
Link: https://lore.kernel.org/r/20250307171417.267488-1-ttabi@nvidia.com
Signed-off-by: Kees Cook <kees@kernel.org>

Author: ttabi

include/uapi/linux/elf.h

@@ -291,8 +291,18 @@ typedef struct elf64_phdr {
 #define SHF_WRITE		0x1
 #define SHF_ALLOC		0x2
 #define SHF_EXECINSTR		0x4
+#define SHF_MERGE		0x10
+#define SHF_STRINGS		0x20
+#define SHF_INFO_LINK		0x40
+#define SHF_LINK_ORDER		0x80
+#define SHF_OS_NONCONFORMING	0x100
+#define SHF_GROUP		0x200
+#define SHF_TLS			0x400
 #define SHF_RELA_LIVEPATCH	0x00100000
 #define SHF_RO_AFTER_INIT	0x00200000
+#define SHF_ORDERED		0x04000000
+#define SHF_EXCLUDE		0x08000000
+#define SHF_MASKOS		0x0ff00000
 #define SHF_MASKPROC		0xf0000000
 
 /* special section indexes */