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powerpc: use probe_user_read() and probe_user_write()

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Instead of opencoding, use probe_user_read() to failessly read
a user location and probe_user_write() for writing to user.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e041f5eedb23f09ab553be8a91c3de2087147320.1579800517.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy
2020-01-23 17:30:47 +00:00
committed by Michael Ellerman
parent 1e3531982e
commit def0bfdbd6
7 changed files with 14 additions and 62 deletions
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12
arch/powerpc/kernel/process.c
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@@ -1277,16 +1277,6 @@ void show_user_instructions(struct pt_regs *regs)
pc = regs->nip - (NR_INSN_TO_PRINT * 3 / 4 * sizeof(int));
/*
* Make sure the NIP points at userspace, not kernel text/data or
* elsewhere.
*/
if (!__access_ok(pc, NR_INSN_TO_PRINT * sizeof(int), USER_DS)) {
pr_info("%s[%d]: Bad NIP, not dumping instructions.\n",
current->comm, current->pid);
return;
}
seq_buf_init(&s, buf, sizeof(buf));
while (n) {
@@ -1297,7 +1287,7 @@ void show_user_instructions(struct pt_regs *regs)
for (i = 0; i < 8 && n; i++, n--, pc += sizeof(int)) {
int instr;
if (probe_kernel_address((const void *)pc, instr)) {
if (probe_user_read(&instr, (void __user *)pc, sizeof(instr))) {
seq_buf_printf(&s, "XXXXXXXX ");
continue;
}