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Differential D122962 Diff 420411 compiler-rt/lib/scudo/standalone/linux.cpp

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compiler-rt/lib/scudo/standalone/linux.cpp

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#include <string.h> #include <string.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/syscall.h> #include <sys/syscall.h>
#include <sys/time.h> #include <sys/time.h>
#include <time.h> #include <time.h>
#include <unistd.h> #include <unistd.h>
#if SCUDO_ANDROID
#include <sys/prctl.h> #include <sys/prctl.h>
// Definitions of prctl arguments to set a vma name in Android kernels. // Definitions of prctl arguments to set a vma name in kernels (Linux from 5.17).
#define ANDROID_PR_SET_VMA 0x53564d41 #ifndef PR_SET_VMA
#define ANDROID_PR_SET_VMA_ANON_NAME 0 #define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
#endif #endif
namespace scudo { namespace scudo {
uptr getPageSize() { return static_cast<uptr>(sysconf(_SC_PAGESIZE)); } uptr getPageSize() { return static_cast<uptr>(sysconf(_SC_PAGESIZE)); }
void NORETURN die() { abort(); } void NORETURN die() { abort(); }
Show All 17 Lines#endif
if (Addr) if (Addr)
MmapFlags |= MAP_FIXED; MmapFlags |= MAP_FIXED;
void *P = mmap(Addr, Size, MmapProt, MmapFlags, -1, 0); void *P = mmap(Addr, Size, MmapProt, MmapFlags, -1, 0);
if (P == MAP_FAILED) { if (P == MAP_FAILED) {
if (!(Flags & MAP_ALLOWNOMEM) || errno != ENOMEM) if (!(Flags & MAP_ALLOWNOMEM) || errno != ENOMEM)
dieOnMapUnmapError(errno == ENOMEM ? Size : 0); dieOnMapUnmapError(errno == ENOMEM ? Size : 0);
return nullptr; return nullptr;
} }
#if SCUDO_ANDROID
if (Name) if (Name)
prctl(ANDROID_PR_SET_VMA, ANDROID_PR_SET_VMA_ANON_NAME, P, Size, Name); prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, P, Size, Name);
#endif
return P; return P;
} }
void unmap(void *Addr, uptr Size, UNUSED uptr Flags, void unmap(void *Addr, uptr Size, UNUSED uptr Flags,
UNUSED MapPlatformData *Data) { UNUSED MapPlatformData *Data) {
if (munmap(Addr, Size) != 0) if (munmap(Addr, Size) != 0)
dieOnMapUnmapError(); dieOnMapUnmapError();
} }
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