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13 June 2022, 11:31:42 UTC
Revision f4d43bd579f13219ffd3cae48432eab5bbac2d6f authored by Hugh Dickins on 25 May 2007, 23:39:17 UTC, committed by Linus Torvalds on 26 May 2007, 00:37:46 UTC 
fix compat console unimap regression
 
Why is it that since the 2f1a2ccb9c0de632ab07193becf5f7121794f6ae console
UTF-8 fixes went into 2.6.22-rc1, the PowerMac G5 shows only inverse video
question marks for the text on tty2-6? whereas tty1 is fine, and so is x86.

No fault of that patch: by removing the old fallback behaviour, it reveals
that 32-bit setfont running on 64-bit kernels has only really worked on
the current console, the rest getting faked by that inadequate fallback.

Bring the compat do_unimap_ioctl into line with the main one: PIO_UNIMAP
and GIO_UNIMAP apply to the specified tty, not redirected to fg_console.
Use the same checks, and most particularly, remember to check access_ok:
con_set_unimap and con_get_unimap are using __get_user and __put_user.

And the compat vt_check should ask for the same capability as the main
one, CAP_SYS_TTY_CONFIG rather than CAP_SYS_ADMIN.  Added in vt_ioctl's
vc_cons_allocated check for safety, though failure may well be impossible.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 1ea0975
History
Tip revision: f4d43bd579f13219ffd3cae48432eab5bbac2d6f authored by Hugh Dickins on 25 May 2007, 23:39:17 UTC
fix compat console unimap regression
Tip revision: f4d43bd
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.gitignore -rw-r--r-- 572 bytes
.mailmap -rw-r--r-- 3.6 KB
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CREDITS -rw-r--r-- 89.3 KB
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