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33 lines
1.2 KiB
33 lines
1.2 KiB
9 years ago
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--- PRoot-5.1.0/src/tracee/mem.c 2014-12-15 15:18:11.000000000 +0100
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+++ src/src/tracee/mem.c 2016-03-20 10:37:46.288702967 +0100
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@@ -131,6 +131,9 @@
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/* Copy the bytes in the last word carefully since we have to
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* overwrite only the relevant ones. */
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+ /* Clear errno so we won't detect previous syscall failure as ptrace one */
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+ errno = 0;
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+
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word = ptrace(PTRACE_PEEKDATA, tracee->pid, dest + i, NULL);
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if (errno != 0) {
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note(tracee, WARNING, SYSTEM, "ptrace(PEEKDATA)");
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@@ -236,6 +239,9 @@
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nb_trailing_bytes = size % sizeof(word_t);
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nb_full_words = (size - nb_trailing_bytes) / sizeof(word_t);
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+ /* Clear errno so we won't detect previous syscall failure as ptrace one */
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+ errno = 0;
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+
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/* Copy one word by one word, except for the last one. */
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for (i = 0; i < nb_full_words; i++) {
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word = ptrace(PTRACE_PEEKDATA, tracee->pid, src + i, NULL);
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@@ -366,6 +372,9 @@
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nb_trailing_bytes = max_size % sizeof(word_t);
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nb_full_words = (max_size - nb_trailing_bytes) / sizeof(word_t);
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+ /* Clear errno so we won't detect previous syscall failure as ptrace one */
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+ errno = 0;
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+
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/* Copy one word by one word, except for the last one. */
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for (i = 0; i < nb_full_words; i++) {
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word = ptrace(PTRACE_PEEKDATA, tracee->pid, src + i, NULL);
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