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From 96194ed74158f0b9976fae43a910ad14eaea141e Mon Sep 17 00:00:00 2001
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From: Eugene Syromyatnikov <evgsyr@gmail.com>
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Date: Fri, 12 Jul 2019 14:57:28 +0200
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Subject: [PATCH 2/3] evdev: fix array size calculation in decode_bitset_
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max_nr is in bits (as it is a number of flags), result is in bytes, and
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the array allocation has to be in personality words.
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There's still an open question, however, what to do on big-endian
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architectures when a non-divisible-by-4 value is returned.
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* evdev.c (decode_bitset_): Declare size_bits, initialise it and use it
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later instead of size; round up size by personality's word boundary.
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---
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evdev.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/evdev.c b/evdev.c
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index 4b811cf8..a3d9cb55 100644
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--- a/evdev.c
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+++ b/evdev.c
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@@ -151,10 +151,14 @@ decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
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tprints(", ");
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unsigned int size;
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+ unsigned int size_bits;
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+
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if ((kernel_ulong_t) tcp->u_rval > max_nr / 8)
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- size = max_nr;
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+ size_bits = max_nr;
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else
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- size = tcp->u_rval * 8;
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+ size_bits = tcp->u_rval * 8;
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+
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+ size = ROUNDUP(ROUNDUP_DIV(size_bits, 8), current_wordsize);
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if (syserror(tcp) || !size) {
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printaddr(arg);
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@@ -170,13 +174,13 @@ decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
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tprints("[");
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int bit_displayed = 0;
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- int i = next_set_bit(decoded_arg, 0, size);
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+ int i = next_set_bit(decoded_arg, 0, size_bits);
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if (i < 0) {
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tprints(" 0 ");
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} else {
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printxval_dispatch(decode_nr, decode_nr_size, i, dflt, xt);
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- while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
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+ while ((i = next_set_bit(decoded_arg, i + 1, size_bits)) > 0) {
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if (abbrev(tcp) && bit_displayed >= 3) {
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tprints(", ...");
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break;
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--
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2.13.6
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