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glibc/sysdeps/unix/sysv/linux/x86_64/include/asm/prctl.h

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x86/CET: Extend arch_prctl syscall for CET control CET arch_prctl bits should be defined in <asm/prctl.h> from Linux kernel header files. Add x86 <include/asm/prctl.h> for pre-CET kernel header files. Note: sysdeps/unix/sysv/linux/x86/include/asm/prctl.h should be removed if <asm/prctl.h> from the required kernel header files contains CET arch_prctl bits. /* CET features: IBT: GNU_PROPERTY_X86_FEATURE_1_IBT SHSTK: GNU_PROPERTY_X86_FEATURE_1_SHSTK */ /* Return CET features in unsigned long long *addr: features: addr[0]. shadow stack base address: addr[1]. shadow stack size: addr[2]. */ # define ARCH_CET_STATUS 0x3001 /* Disable CET features in unsigned int features. */ # define ARCH_CET_DISABLE 0x3002 /* Lock all CET features. */ # define ARCH_CET_LOCK 0x3003 /* Allocate a new shadow stack with unsigned long long *addr: IN: requested shadow stack size: *addr. OUT: allocated shadow stack address: *addr. */ # define ARCH_CET_ALLOC_SHSTK 0x3004 /* Return legacy region bitmap info in unsigned long long *addr: address: addr[0]. size: addr[1]. */ # define ARCH_CET_LEGACY_BITMAP 0x3005 Reviewed-by: Carlos O'Donell <carlos@redhat.com> * sysdeps/unix/sysv/linux/x86/include/asm/prctl.h: New file. * sysdeps/unix/sysv/linux/x86/cpu-features.c: Include <sys/prctl.h> and <asm/prctl.h>. (get_cet_status): Call arch_prctl with ARCH_CET_STATUS. * sysdeps/unix/sysv/linux/x86/dl-cet.h: Include <sys/prctl.h> and <asm/prctl.h>. (dl_cet_allocate_legacy_bitmap): Call arch_prctl with ARCH_CET_LEGACY_BITMAP. (dl_cet_disable_cet): Call arch_prctl with ARCH_CET_DISABLE. (dl_cet_lock_cet): Call arch_prctl with ARCH_CET_LOCK. * sysdeps/x86/libc-start.c: Include <startup.h>.
2018-07-24 19:23:03 +00:00
/* FIXME: CET arch_prctl bits should come from the kernel header files.
This file should be removed if <asm/prctl.h> from the required kernel
header files contains CET arch_prctl bits. */
#include_next <asm/prctl.h>
x86/cet: Sync with Linux kernel 6.6 shadow stack interface Sync with Linux kernel 6.6 shadow stack interface. Since only x86-64 is supported, i386 shadow stack codes are unchanged and CET shouldn't be enabled for i386. 1. When the shadow stack base in TCB is unset, the default shadow stack is in use. Use the current shadow stack pointer as the marker for the default shadow stack. It is used to identify if the current shadow stack is the same as the target shadow stack when switching ucontexts. If yes, INCSSP will be used to unwind shadow stack. Otherwise, shadow stack restore token will be used. 2. Allocate shadow stack with the map_shadow_stack syscall. Since there is no function to explicitly release ucontext, there is no place to release shadow stack allocated by map_shadow_stack in ucontext functions. Such shadow stacks will be leaked. 3. Rename arch_prctl CET commands to ARCH_SHSTK_XXX. 4. Rewrite the CET control functions with the current kernel shadow stack interface. Since CET is no longer enabled by kernel, a separate patch will enable shadow stack during startup.
2023-12-29 16:43:49 +00:00
#ifndef ARCH_SHSTK_ENABLE
/* Enable SHSTK features in unsigned long int features. */
# define ARCH_SHSTK_ENABLE 0x5001
/* Disable SHSTK features in unsigned long int features. */
# define ARCH_SHSTK_DISABLE 0x5002
/* Lock SHSTK features in unsigned long int features. */
# define ARCH_SHSTK_LOCK 0x5003
/* Unlock SHSTK features in unsigned long int features. */
# define ARCH_SHSTK_UNLOCK 0x5004
/* Return SHSTK features in unsigned long int features. */
# define ARCH_SHSTK_STATUS 0x5005
/* ARCH_SHSTK_ features bits */
# define ARCH_SHSTK_SHSTK 0x1
# define ARCH_SHSTK_WRSS 0x2
#endif
x86-64: Update _dl_tlsdesc_dynamic to preserve AMX registers _dl_tlsdesc_dynamic should also preserve AMX registers which are caller-saved. Add X86_XSTATE_TILECFG_ID and X86_XSTATE_TILEDATA_ID to x86-64 TLSDESC_CALL_STATE_SAVE_MASK. Compute the AMX state size and save it in xsave_state_full_size which is only used by _dl_tlsdesc_dynamic_xsave and _dl_tlsdesc_dynamic_xsavec. This fixes the AMX part of BZ #31372. Tested on AMX processor. AMX test is enabled only for compilers with the fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114098 GCC 14 and GCC 11/12/13 branches have the bug fix. Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
2024-02-28 20:08:03 +00:00
#ifndef ARCH_GET_XCOMP_PERM
# define ARCH_GET_XCOMP_PERM 0x1022
# define ARCH_REQ_XCOMP_PERM 0x1023
#endif