Author: emaste Date: Wed Apr 1 15:34:10 2020 New Revision: 359513 URL: https://svnweb.freebsd.org/changeset/base/359513
Log: elf.5: add definitions of FreeBSD notes 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 Modified: head/share/man/man5/elf.5 Modified: head/share/man/man5/elf.5 ============================================================================== --- head/share/man/man5/elf.5 Wed Apr 1 15:25:16 2020 (r359512) +++ head/share/man/man5/elf.5 Wed Apr 1 15:34:10 2020 (r359513) @@ -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 , _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
