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library: protect against large version numbers.

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Linux release numbers are x.y.z we assumed but never protected
against x> 0x7fff and y,z > 0xff before.

Linux release in 1991, 1 major release per 6 years so we're fine
until 7452, unless they do way too many minor rels (max being 39)
This commit is contained in:
Craig Small 2016-05-01 17:14:48 +10:00
parent 6b5cb345c5
commit 9abf7d879d
2 changed files with 11 additions and 2 deletions
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11
doc/procps_linux_version.3
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@ -16,7 +16,7 @@
.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
.\" %%%LICENSE_END
.\"
.TH PROCPS_LINUX_VERSION 3 2016-04-14 "libproc-2"
.TH PROCPS_LINUX_VERSION 3 2016-05-01 "libproc-2"
.\" Please adjust this date whenever revising the manpage.
.\"
.SH NAME
@ -79,6 +79,15 @@ Contains the release version of the Linux kernel or proc filesystem.
.B procps_linux_version()
first appeared in libproc-2 version 0.0.
.SH BUGS
Due to the way the three numbers are encoded into a single integer,
.BR procps_linux_version ()
and the associated macros assume 255 for the maximum value for the
minor and patch level and 32767 (hex 0x7fff) for the maximum value
for the major version. In other words, when Linux v 32768.0.0 comes
out, this function will break.
.\" Maj/6yr - In 7452 we'll think of something
.SH SEE ALSO
.BR fopen (3),
.BR proc (5).

2
proc/version.h
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@ -29,7 +29,7 @@ __BEGIN_DECLS
int procps_linux_version(void);
/* Convenience macros for composing/decomposing version codes */
#define LINUX_VERSION(x,y,z) (0x10000*(x) + 0x100*(y) + z)
#define LINUX_VERSION(x,y,z) (0x10000*((x)&0x7fff) + 0x100*((y)&0xff) + (z)&0xff)
#define LINUX_VERSION_MAJOR(x) (((x)>>16) & 0xFF)
#define LINUX_VERSION_MINOR(x) (((x)>> 8) & 0xFF)
#define LINUX_VERSION_PATCH(x) ( (x) & 0xFF)