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Fix a race on architectures with prioritized interrupts (such as m68k)

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which can causes crashes in drivers/char/random.c:get_reg().
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Merge tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

Pull /dev/random bug fix from Ted Ts'o:
 "Fix a race on architectures with prioritized interrupts (such as m68k)
  which can causes crashes in drivers/char/random.c:get_reg()"

* tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  fix race in drivers/char/random.c:get_reg()
This commit is contained in:
Linus Torvalds 2017-06-02 16:19:47 -07:00
commit 5a4829b564
1 changed files with 5 additions and 1 deletions
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6
drivers/char/random.c
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@ -1097,12 +1097,16 @@ static void add_interrupt_bench(cycles_t start)
static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs)
{
__u32 *ptr = (__u32 *) regs;
unsigned long flags;
if (regs == NULL)
return 0;
local_irq_save(flags);
if (f->reg_idx >= sizeof(struct pt_regs) / sizeof(__u32))
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)