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1c33bb0507
linux/arch/x86/include/uapi/asm
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Chang S. Bae 1c33bb0507 x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ 
Historically, signal.h defines MINSIGSTKSZ (2KB) and SIGSTKSZ (8KB), for
use by all architectures with sigaltstack(2). Over time, the hardware state
size grew, but these constants did not evolve. Today, literal use of these
constants on several architectures may result in signal stack overflow, and
thus user data corruption.

A few years ago, the ARM team addressed this issue by establishing
getauxval(AT_MINSIGSTKSZ). This enables the kernel to supply a value
at runtime that is an appropriate replacement on current and future
hardware.

Add getauxval(AT_MINSIGSTKSZ) support to x86, analogous to the support
added for ARM in

  94b07c1f8c ("arm64: signal: Report signal frame size to userspace via auxv").

Also, include a documentation to describe x86-specific auxiliary vectors.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Len Brown <len.brown@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20210518200320.17239-4-chang.seok.bae@intel.com
2021-05-19 12:18:45 +02:00
..
a.out.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
auxvec.h x86/elf: Support a new ELF aux vector AT_MINSIGSTKSZ 2021-05-19 12:18:45 +02:00
bitsperlong.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
boot.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
bootparam.h x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
byteorder.h treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
debugreg.h x86/traps: Handle #DB for bus lock 2021-03-28 22:52:15 +02:00
e820.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
hw_breakpoint.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
hwcap2.h x86/elf: Enumerate kernel FSGSBASE capability in AT_HWCAP2 2020-06-18 15:47:05 +02:00
ist.h License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
Kbuild treewide: Add SPDX license identifier - Kbuild 2019-05-30 11:32:33 -07:00
kvm_para.h x86/kvm: Reserve KVM_FEATURE_MSI_EXT_DEST_ID 2020-10-28 13:52:05 -04:00
kvm_perf.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
kvm.h KVM: nVMX: Properly pad 'struct kvm_vmx_nested_state_hdr' 2021-05-07 06:06:13 -04:00
ldt.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
mce.h x86/mce: Drop bogus comment about mce.kflags 2020-04-17 11:12:21 +02:00
mman.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
msgbuf.h x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
msr.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
mtrr.h License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
perf_regs.h perf/x86: Disable extended registers for non-supported PMUs 2019-06-24 19:19:23 +02:00
posix_types_32.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
posix_types_64.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
posix_types_x32.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
posix_types.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
prctl.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
processor-flags.h Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-29 17:02:49 -08:00
ptrace-abi.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
ptrace.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
sembuf.h arch: sembuf.h: make uapi asm/sembuf.h self-contained 2019-12-04 19:44:14 -08:00
setup.h
sgx.h x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
shmbuf.h x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
sigcontext32.h treewide: add "WITH Linux-syscall-note" to SPDX tag of uapi headers 2019-07-25 11:05:10 +02:00
sigcontext.h x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
siginfo.h signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE 2018-10-03 16:46:43 +02:00
signal.h arch: move SA_* definitions to generic headers 2020-11-23 10:31:05 -06:00
stat.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
statfs.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
svm.h KVM: SVM: Add support for CR8 write traps for an SEV-ES guest 2020-12-15 05:20:54 -05:00
swab.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
ucontext.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
unistd.h x86/syscalls: Revert "x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long" 2020-05-26 16:42:43 +02:00
vm86.h x86/vm86/32: Remove VM86_SCREEN_BITMAP support 2021-01-21 20:08:53 +01:00
vmx.h KVM: VMX: Add basic handling of VM-Exit from SGX enclave 2021-04-20 04:18:54 -04:00
vsyscall.h License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00