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authorRusty Russell <rusty@rustcorp.com.au>2009-04-19 23:14:00 -0600
committerRusty Russell <rusty@rustcorp.com.au>2009-04-19 23:14:01 +0930
commita489f0b555b753f9df8ddc24c7e74f657ef7ee7b (patch)
tree560bd8c56524b658eb0b46e03ef42e262eb5f9b7 /drivers/lguest/lg.h
parent88df781afb788fa588dbf2e77f205214022a8893 (diff)
lguest: fix guest crash on non-linear addresses in gdt pvops
Fixes guest crash 'lguest: bad read address 0x4800000 len 256' The new per-cpu allocator ends up handing a non-linear address to write_gdt_entry. We do __pa() on it, and hand it to the host, which kills us. I've long wanted to make the hypercall "LOAD_GDT_ENTRY" to match the IDT code, but had no pressing reason until now. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: lguest@ozlabs.org
Diffstat (limited to 'drivers/lguest/lg.h')
-rw-r--r--drivers/lguest/lg.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index ac8a4a3741b..af92a176697 100644
--- a/drivers/lguest/lg.h
+++ b/drivers/lguest/lg.h
@@ -158,7 +158,8 @@ void free_interrupts(void);
/* segments.c: */
void setup_default_gdt_entries(struct lguest_ro_state *state);
void setup_guest_gdt(struct lg_cpu *cpu);
-void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num);
+void load_guest_gdt_entry(struct lg_cpu *cpu, unsigned int i,
+ u32 low, u32 hi);
void guest_load_tls(struct lg_cpu *cpu, unsigned long tls_array);
void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt);
void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt);