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Index: strace-4.24/evdev.c
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===================================================================
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--- strace-4.24.orig/evdev.c 2019-06-13 23:42:43.294304862 +0200
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+++ strace-4.24/evdev.c 2019-06-13 23:43:35.588294946 +0200
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@@ -143,6 +143,14 @@
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return RVAL_IOCTL_DECODED;
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}
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+# ifndef ROUNDUP_DIV
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+# define ROUNDUP_DIV(val_, div_) (((val_) + (div_) - 1) / (div_))
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+# endif
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+
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+# ifndef ROUNDUP
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+# define ROUNDUP(val_, div_) (ROUNDUP_DIV((val_), (div_)) * (div_))
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+# endif
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+
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static int
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decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
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const struct xlat decode_nr[], const unsigned int max_nr,
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@@ -151,25 +159,36 @@
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tprints(", ");
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unsigned int size;
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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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+ unsigned int size_bits;
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+
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+ if ((kernel_ulong_t) tcp->u_rval > max_nr / CHAR_BIT)
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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 * CHAR_BIT;
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+
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+ size = ROUNDUP(ROUNDUP_DIV(size_bits, CHAR_BIT), current_wordsize);
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+
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+ if (syserror(tcp) || !size) {
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+ printaddr(arg);
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+
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+ return RVAL_IOCTL_DECODED;
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+ }
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+
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char decoded_arg[size];
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- if (umove_or_printaddr(tcp, arg, &decoded_arg))
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+ if (umoven_or_printaddr(tcp, arg, size, decoded_arg))
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return RVAL_IOCTL_DECODED;
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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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