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modify_ldt.2: Tweaks after feedback from Andy Lutomirski 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-01-30 16:11:02 +01:00
parent 520789667e
commit c79a3031bb
1 changed files with 9 additions and 5 deletions
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14
man2/modify_ldt.2
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@ -100,7 +100,7 @@ field is the segment type (data, expand-down data, non-conforming code, or
conforming code). conforming code).
The other fields match their descriptions in the CPU manual, although The other fields match their descriptions in the CPU manual, although
.BR modify_ldt () .BR modify_ldt ()
cannot set the accessed bit. cannot set the hardware-defined "accessed" bit described in the CPU manual.
.PP .PP
A A
.I user_desc .I user_desc
@ -119,7 +119,9 @@ and
.I limit .I limit
to 0. to 0.
.PP .PP
A conforming code segment will be rejected if A conforming code segment (i.e., one with
.IR contents==3 )
will be rejected if
.I .I
func func
is 1 or if is 1 or if
@ -186,9 +188,11 @@ The normal use for
is to run legacy 16-bit or segmented 32-bit code. is to run legacy 16-bit or segmented 32-bit code.
Not all kernels allow 16-bit segments to be installed, however. Not all kernels allow 16-bit segments to be installed, however.
.SH BUGS .SH BUGS
On 64-bit kernels before Linux 3.19, one of the padding bits in On 64-bit kernels before Linux 3.19,
.IR user_desc , .\" commit e30ab185c490e9a9381385529e0fd32f0a399495
if set, would prevent the descriptor from being considered empty. setting the "lm" padding bit in
.IR user_desc
prevents the descriptor from being considered empty.
.SH SEE ALSO .SH SEE ALSO
.BR arch_prctl (2), .BR arch_prctl (2),
.BR set_thread_area (2), .BR set_thread_area (2),