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Merge branch 'v4.4/topic/mm-kaslr-pax_usercopy' into linux-linaro-lsk-v4.4

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This commit is contained in:
Alex Shi 2017-03-24 11:27:33 +08:00
commit 11d2c48e81
1 changed files with 6 additions and 1 deletions
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7
fs/proc/kcore.c
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@ -516,7 +516,12 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
if (kern_addr_valid(start)) {
unsigned long n;
n = copy_to_user(buffer, (char *)start, tsz);
/*
* Using bounce buffer to bypass the
* hardened user copy kernel text checks.
*/
memcpy(buf, (char *) start, tsz);
n = copy_to_user(buffer, buf, tsz);
/*
* We cannot distinguish between fault on source
* and fault on destination. When this happens