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modify_ldt.2: Minor fixups 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2015-02-05 09:15:12 +01:00
parent f89f50fa38
commit 6da93ae616
1 changed files with 6 additions and 4 deletions
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10
man2/modify_ldt.2
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@ -190,16 +190,18 @@ Not all kernels allow 16-bit segments to be installed, however.
.PP
Even on 64-bit kernels,
.BR modify_ldt (2)
cannot be used to create a long mode (i.e. 64-bit) code segment. The
undocumented field "lm" in
cannot be used to create a long mode (i.e., 64-bit) code segment.
The undocumented field "lm" in
.IR user_desc
is not useful, and, despite its name, does not result in a long mode segment.
is not useful, and, despite its name,
does not result in a long mode segment.
.SH BUGS
On 64-bit kernels before Linux 3.19,
.\" commit e30ab185c490e9a9381385529e0fd32f0a399495
setting the "lm" bit in
.IR user_desc
prevents the descriptor from being considered empty. Keep in mind that the
prevents the descriptor from being considered empty.
Keep in mind that the
"lm" bit does not exist in the 32-bit headers, but these buggy kernels
will still notice the bit even when set in a 32-bit process.
.SH SEE ALSO