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elf.5: add definitions of FreeBSD notes

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I hope to extend this with some more detail in the future but it gives
a good starting point.

Thanks to 0mp for assistance with markup.

Reviewed by:	jkoshy
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D23982
This commit is contained in:
Ed Maste 2020-04-01 15:34:10 +00:00
parent 0bf56da32d
commit 51ae128421
1 changed files with 26 additions and 0 deletions
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26
share/man/man5/elf.5
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@ -1296,6 +1296,32 @@ fields are padded to ensure 4-byte alignemnt.
and
.Va descsz
specify the unpadded length.
.Pp
.Fx
defines the following ELF note types
.Po with corresponding interpretation of
.Va desc Pc :
.Bl -tag -width 4n
.It Dv NT_FREEBSD_ABI_TAG Pq Value: 1
Indicates the OS ABI version in a form of a 32-bit integer containing expected
ABI version
.Po i.e.,
.Dv __FreeBSD_version Pc .
.It Dv NT_FREEBSD_NOINIT_TAG Pq Value: 2
Indicates that crt does not call init.
.Va desc
is ignored.
.It Dv NT_FREEBSD_ARCH_TAG Pq Value: 3
.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
.El
.El
.Sh SEE ALSO
.Xr as 1 ,
.Xr gdb 1 ,