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A text cursor in the tty; LDLS sets net_device.priv_len

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The virtual terminals never drew a cursor. Each now paints a steady
block (the cell with its colours swapped), erased before and redrawn
after every output byte, redrawn by a repaint, and hidden by
ESC [ ? 25 l as curses programs ask.

r8169 under LDLS on the TUF A15 got through probe and died in ndo_open
on __fortify_panic. netdev_priv() is `dev->priv` now, a flexible array
counted by net_device.priv_len, and rtl_open's memset of its ring
bookkeeping is bounds-checked against it. The allocator left priv_len
zero, so the driver saw an area of no bytes. It is set from BTF when the
kernel has the member. __fortify_panic also says which check, how many
bytes it had and wanted, and where from.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015f73FesGZGYPkmDvUcj6QX
This commit is contained in:
Nexoniarz 2026-10-25 18:25:30 +01:00
commit 96389ada8f
7 changed files with 86 additions and 5 deletions
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10
include/dev/vt.h
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@ -112,6 +112,16 @@ struct vt {
int esc_parm[VT_MAXPARM];
int esc_nparm;
int esc_private;
int esc_qmark; // the marker was '?': a DEC private mode
// The text cursor, a steady block. Drawn by painting its cell inverted over
// the grid, so the grid never holds it: curs_drawn says whether the screen
// currently does, and where, because erasing it means repainting that cell
// from the grid -- after the byte that moves the cursor has been consumed.
// DECTCEM (ESC [ ? 25 l) hides it; curses programs do before drawing.
int curs_hidden;
int curs_drawn;
int curs_x, curs_y;
// UTF-8 decoder.
uint32 u8_cp;