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693c819fed
- Separate out the vdso sources into common, vdso32, and vdso64 directories. - Build the 32- and 64-bit vdsos in their respective subdirectories; this greatly simplifies the build flags handling. - Unify the mangling of Makefile flags between the 32- and 64-bit vdso code as much as possible; all common rules are put in arch/x86/entry/vdso/common/Makefile.include. The remaining is very simple for 32 bits; the 64-bit one is only slightly more complicated because it contains the x32 generation rule. - Define __DISABLE_EXPORTS when building the vdso. This need seems to have been masked by different ordering compile flags before. - Change CONFIG_X86_64 to BUILD_VDSO32_64 in vdso32/system_call.S, to make it compatible with including fake_32bit_build.h. - The -fcf-protection= option was "leaking" from the kernel build, for reasons that was not clear to me. Furthermore, several distributions ship with it set to a default value other than "-fcf-protection=none". Make it match the configuration options for *user space*. Note that this patch may seem large, but the vast majority of it is simply code movement. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://patch.msgid.link/20251216212606.1325678-4-hpa@zytor.com
16 lines
496 B
C
16 lines
496 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022-2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <linux/types.h>
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#include "lib/vdso/getrandom.c"
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ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
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{
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return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
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}
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ssize_t getrandom(void *, size_t, unsigned int, void *, size_t)
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__attribute__((weak, alias("__vdso_getrandom")));
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