d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

elfctl: allow features to be specified by value

Browse Source 
This will allow elfctl on older releases to set bits that are not yet
known there, so that the binary will have the correct settings applied
if run on a later FreeBSD version.

PR:		252629 (related)
Suggested by:	kib
Reviewed by:	gbe (manpage, earlier), kib
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28284
This commit is contained in:
Ed Maste 2021-01-22 12:22:35 -05:00
parent 57a543d8b8
commit 86f33b5fcf
2 changed files with 35 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
usr.bin/elfctl/elfctl.1
View File

@ -26,7 +26,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd January 12, 2021
.Dd January 22, 2021
.Dt ELFCTL 1
.Os
.Sh NAME
@ -64,7 +64,8 @@ to turn on the features,
to turn off the features,
.Dq Li =
to only turn on the given features.
A comma separated list of feature names follows the operation.
A comma separated list of feature names or numeric values follows the
operation.
.El
.Pp
If
@ -86,6 +87,16 @@ command:
elfctl file
elfctl -e +aslr file
.Ed
.Pp
Features may be specified as numerical values:
.Bd -literal -offset -indent
elfctl -e =0x0001,0x0004 file
.Ed
.Pp
Features may also be specified as a single combined value:
.Bd -literal -offset -indent
elfctl -e =0x5 file
.Ed
.Sh HISTORY
.Nm
first appeared in

19
usr.bin/elfctl/elfctl.c
View File

@ -33,7 +33,9 @@
#include <sys/endian.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <gelf.h>
#include <getopt.h>
@ -245,11 +247,28 @@ convert_to_feature_val(char *feature_str, uint32_t *feature_val)
}
}
if (i == len) {
if (isdigit(feature[0])) {
char *eptr;
long val;
errno = 0;
val = strtol(feature, &eptr, 0);
if (eptr == feature || *eptr != '\0')
errno = EINVAL;
else if (val > UINT_MAX)
errno = ERANGE;
if (errno != 0) {
warn("%s invalid", feature);
return (false);
}
input != val;
} else {
warnx("%s is not a valid feature", feature);
if (!iflag)
return (false);
}
}
}
if (operation == '+') {
*feature_val |= input;