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[dfsan] Fix release_shadow_space.c #94770

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Merged
merged 1 commit into from
Jun 8, 2024
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[dfsan] Fix release_shadow_space.c #94770

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14 changes: 10 additions & 4 deletions compiler-rt/test/dfsan/release_shadow_space.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,6 @@
// DFSAN_OPTIONS=no_huge_pages_for_shadow=false RUN: %clang_dfsan %s -DORIGIN_TRACKING -mllvm -dfsan-track-origins=1 -o %t && %run %t
// DFSAN_OPTIONS=no_huge_pages_for_shadow=true RUN: %clang_dfsan %s -DORIGIN_TRACKING -mllvm -dfsan-track-origins=1 -o %t && %run %t

// This test is flaky right now: https://github.com/llvm/llvm-project/issues/91287
// UNSUPPORTED: target={{.*}}

#include <assert.h>
#include <sanitizer/dfsan_interface.h>
#include <stdbool.h>
Expand All @@ -26,7 +23,11 @@ size_t get_rss_kb() {
char buf[256];
while (fgets(buf, sizeof(buf), f) != NULL) {
int64_t rss;
if (sscanf(buf, "Rss: %ld kB", &rss) == 1)
// DFSan's sscanf is broken and doesn't check for ordinary characters in
// the format string, hence we use strstr as a secondary check
// (https://github.com/llvm/llvm-project/issues/94769).
if ((sscanf(buf, "Rss: %ld kB", &rss) == 1) &&
(strstr(buf, "Rss: ") != NULL))
ret += rss;
}
assert(feof(f));
Expand Down Expand Up @@ -73,6 +74,11 @@ int main(int argc, char **argv) {
before, after_mmap, after_mmap_and_set_label, after_fixed_mmap,
after_mmap_and_set_label2, after_munmap);

// This is orders of magnitude larger than we expect (typically < 10,000KB).
// It is a quick check to ensure that the RSS calculation function isn't
// egregriously wrong.
assert(before < 1000000);

const size_t mmap_cost_kb = map_size >> 10;
// Shadow space (1:1 with application memory)
const size_t mmap_shadow_cost_kb = sizeof(dfsan_label) * mmap_cost_kb;
Expand Down
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