Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 27 Apr 2003 17:09:04 -0400 | From | Chuck Ebbert <> | Subject | desc v0.61 found a 2.5 kernel bug |
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desc v0.61 running on Linux 2.5.68-rel:
GDT at c0306300, 32 entries:
GDT# 12: base:00000000 limit:ffffffff flags:c09b <P:1 DPL:0 32-bit Code> GDT# 13: base:00000000 limit:ffffffff flags:c093 <P:1 DPL:0 RW Data> GDT# 14: base:00000000 limit:ffffffff flags:c0fb <P:1 DPL:3 32-bit Code> GDT# 15: base:00000000 limit:ffffffff flags:c0f3 <P:1 DPL:3 RW Data> GDT# 16: base:c0353800 limit:000eb flags:008b <P:1 DPL:0 Busy TSS>
TSS at c0353800, 236 bytes:
CS:0000 <GDT#00,RPL0> EIP:00000000 eflags:00000000 SS0:0068 <GDT#13,RPL0> ESP0:c2806000 SS:0000 <GDT#00,RPL0> ESP:00000000 DS:0000 <GDT#00,RPL0> ES:0000 <GDT#00,RPL0> FS:0000 <GDT#00,RPL0> GS:0000 <GDT#00,RPL0> LDT:0011 <GDT#02,RPL1> CR3:00000000 ^^^^ ^^^^^^^^
The LDT in the kernel's TSS is wrong -- it's shifted right by three
bits and should be 0088 <GDT entry #17, RPL 0>
And shouldn't CR3 be intitialized in case anyone actually wants to switch back to the kernel TSS?
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