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elf.5: expand on NT_FREEBSD_FEATURE_CTL bit definitions

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Based on suggestions from kib in review D23982.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
emaste 2020-04-03 17:17:17 +00:00
parent be2f3ab689
commit 023440513b
1 changed files with 18 additions and 6 deletions
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24
share/man/man5/elf.5
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@ -1317,12 +1317,24 @@ is ignored.
Contains the MACHINE_ARCH that the executable was built for.
.It Dv NT_FREEBSD_FEATURE_CTL Pq Value: 4
Contains a bitmask of mitigations and features to enable:
.Bl -column "NT_FREEBSD_FCTL_PROTMAX_DISABLE" "0x00" "Disable implicit PROT_MAX"
.Sy Name Ta Sy Value Ta Sy Description
.It NT_FREEBSD_FCTL_ASLR_DISABLE Ta 0x01 Ta Disable ASLR
.It NT_FREEBSD_FCTL_PROTMAX_DISABLE Ta 0x02 Ta Disable implicit PROT_MAX
.It NT_FREEBSD_FCTL_STKGAP_DISABLE Ta 0x04 Ta Disable stack gap
.It NT_FREEBSD_FCTL_WXNEEDED Ta 0x08 Ta Binary makes W+X mappings
.Bl -tag -width 4n
.\" .Bl -column "NT_FREEBSD_FCTL_PROTMAX_DISABLE" "0x00" "Disable implicit PROT_MAX"
.\" .Sy Name Ta Sy Value Ta Sy Description
.It NT_FREEBSD_FCTL_ASLR_DISABLE Pq Value: 0x01
Request that address randomization (ASLR) not be performed.
See
.Xr security 7 .
.It NT_FREEBSD_FCTL_PROTMAX_DISABLE Pq Value: 0x02
Request that
.Xr mmap 2
calls not set PROT_MAX to the initial value of the
.Fa prot
argument.
.It NT_FREEBSD_FCTL_STKGAP_DISABLE Pq Value: 0x04
Disable stack gap.
.It NT_FREEBSD_FCTL_WXNEEDED Pq Value: 0x08
Indicate that the binary requires mappings that are simultaneously
writeable and executable.
.El
.El
.Sh SEE ALSO