Date: Mon, 16 Nov 2020 14:07:32 +0100 From: Paul Floyd <pjfloyd@wanadoo.fr> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: FreeBSD 12.2 extra RW program header Message-ID: <8ff8067a-3354-3587-4eda-1aa802f6c86b@wanadoo.fr>
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Hi I see that FreeBSD 12.2 has added an extra RW program header. Can anyone explain what this does? (My initial guess is things like thread mutexes and barriers). Full details: 12.1 Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align PHDR 0x0000000000000040 0x0000000000200040 0x0000000000200040 0x0000000000000230 0x0000000000000230 R 0x8 INTERP 0x0000000000000270 0x0000000000200270 0x0000000000200270 0x0000000000000015 0x0000000000000015 R 0x1 [Requesting program interpreter: /libexec/ld-elf.so.1] LOAD 0x0000000000000000 0x0000000000200000 0x0000000000200000 0x000000000000086c 0x000000000000086c R 0x1000 LOAD 0x0000000000001000 0x0000000000201000 0x0000000000201000 0x00000000000006b0 0x00000000000006b0 R E 0x1000 LOAD 0x0000000000002000 0x0000000000202000 0x0000000000202000 0x0000000000001158 0x0000000000002014 RW 0x1000 DYNAMIC 0x0000000000003028 0x0000000000203028 0x0000000000203028 0x0000000000000130 0x0000000000000130 RW 0x8 12.2: Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align PHDR 0x0000000000000040 0x0000000000200040 0x0000000000200040 0x0000000000000268 0x0000000000000268 R 0x8 INTERP 0x00000000000002a8 0x00000000002002a8 0x00000000002002a8 0x0000000000000015 0x0000000000000015 R 0x1 [Requesting program interpreter: /libexec/ld-elf.so.1] LOAD 0x0000000000000000 0x0000000000200000 0x0000000000200000 0x00000000000008bc 0x00000000000008bc R 0x1000 LOAD 0x00000000000008c0 0x00000000002018c0 0x00000000002018c0 0x00000000000006c0 0x00000000000006c0 R E 0x1000 LOAD 0x0000000000000f80 0x0000000000202f80 0x0000000000202f80 0x0000000000000158 0x0000000000000158 RW 0x1000 extra header here -> LOAD 0x00000000000010d8 0x00000000002040d8 0x00000000002040d8 0x0000000000000090 0x00000000000000a8 RW 0x1000 DYNAMIC 0x0000000000000fa8 0x0000000000202fa8 0x0000000000202fa8 0x0000000000000130 0x0000000000000130 RW 0x8 A+ Paul
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