add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/arch/arm/kernel/elf.c
..
..
@@ -78,13 +78,32 @@
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 EXPORT_SYMBOL(elf_set_personality);
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 /*
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- * Set READ_IMPLIES_EXEC if:
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- *  - the binary requires an executable stack
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- *  - we're running on a CPU which doesn't support NX.
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+ * An executable for which elf_read_implies_exec() returns TRUE will
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+ * have the READ_IMPLIES_EXEC personality flag set automatically.
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+ *
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+ * The decision process for determining the results are:
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+ *
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+ *                 CPU: | lacks NX*  | has NX     |
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+ * ELF:                 |            |            |
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+ * ---------------------|------------|------------|
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+ * missing PT_GNU_STACK | exec-all   | exec-all   |
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+ * PT_GNU_STACK == RWX  | exec-all   | exec-stack |
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+ * PT_GNU_STACK == RW   | exec-all   | exec-none  |
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+ *
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+ *  exec-all  : all PROT_READ user mappings are executable, except when
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+ *              backed by files on a noexec-filesystem.
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+ *  exec-none : only PROT_EXEC user mappings are executable.
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+ *  exec-stack: only the stack and PROT_EXEC user mappings are executable.
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+ *
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+ *  *this column has no architectural effect: NX markings are ignored by
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+ *   hardware, but may have behavioral effects when "wants X" collides with
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+ *   "cannot be X" constraints in memory permission flags, as in
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+ *   https://lkml.kernel.org/r/20190418055759.GA3155@mellanox.com
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+ *
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  */
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 int arm_elf_read_implies_exec(int executable_stack)
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 {
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-	if (executable_stack != EXSTACK_DISABLE_X)
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+	if (executable_stack == EXSTACK_DEFAULT)
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 		return 1;
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 	if (cpu_architecture() < CPU_ARCH_ARMv6)
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 		return 1;