Commit 9dfa7bba authored by Michael Schmitz's avatar Michael Schmitz Committed by Theodore Ts'o

fix race in drivers/char/random.c:get_reg()

get_reg() can be reentered on architectures with prioritized interrupts
(m68k in this case), causing f->reg_index to be incremented after the
range check. Out of bounds memory access past the pt_regs struct results.
This will go mostly undetected unless access is beyond end of memory.

Prevent the race by disabling interrupts in get_reg().

Tested on m68k (Atari Falcon, and ARAnyM emulator).

Kudos to Geert Uytterhoeven for helping to trace this race.
Signed-off-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 08332893
...@@ -1097,12 +1097,16 @@ static void add_interrupt_bench(cycles_t start) ...@@ -1097,12 +1097,16 @@ static void add_interrupt_bench(cycles_t start)
static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs) static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs)
{ {
__u32 *ptr = (__u32 *) regs; __u32 *ptr = (__u32 *) regs;
unsigned long flags;
if (regs == NULL) if (regs == NULL)
return 0; return 0;
local_irq_save(flags);
if (f->reg_idx >= sizeof(struct pt_regs) / sizeof(__u32)) if (f->reg_idx >= sizeof(struct pt_regs) / sizeof(__u32))
f->reg_idx = 0; f->reg_idx = 0;
return *(ptr + f->reg_idx++); ptr += f->reg_idx++;
local_irq_restore(flags);
return *ptr;
} }
void add_interrupt_randomness(int irq, int irq_flags) void add_interrupt_randomness(int irq, int irq_flags)
......
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