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| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2019-02-27 21:11:50 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2019-02-27 21:11:50 +0000 |
| commit | 9cde2249660f19f4ffa6d7703cecfdced27f9917 (patch) | |
| tree | 3a43912617386db72ff90fe311d8119bb793aa11 /lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S | |
| parent | 8015adf96f55714e240cec187adfdcffbddbe2b6 (diff) | |
| download | compiler-rt-9cde2249660f19f4ffa6d7703cecfdced27f9917.tar.gz | |
[hwasan, asan] Intercept vfork.
Summary:
Intercept vfork on arm, aarch64, i386 and x86_64.
Reviewers: pcc, vitalybuka
Subscribers: kubamracek, mgorny, javed.absar, krytarowski, kristof.beyls, #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D58533
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@355030 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S')
| -rw-r--r-- | lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S b/lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S new file mode 100644 index 000000000..20f42f1ea --- /dev/null +++ b/lib/sanitizer_common/sanitizer_common_interceptors_vfork_aarch64.inc.S @@ -0,0 +1,43 @@ +#if defined(__aarch64__) && defined(__linux__) + +#include "sanitizer_common/sanitizer_asm.h" + +ASM_HIDDEN(COMMON_INTERCEPTOR_SPILL_AREA) + +.comm _ZN14__interception10real_vforkE,8,8 +.globl ASM_WRAPPER_NAME(vfork) +ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(vfork)) +ASM_WRAPPER_NAME(vfork): + // Save x30 in the off-stack spill area. + stp xzr, x30, [sp, #-16]! + bl COMMON_INTERCEPTOR_SPILL_AREA + ldp xzr, x30, [sp], 16 + str x30, [x0] + + // Call real vfork. This may return twice. User code that runs between the first and the second return + // may clobber the stack frame of the interceptor; that's why it does not have a frame. + adrp x0, _ZN14__interception10real_vforkE + ldr x0, [x0, :lo12:_ZN14__interception10real_vforkE] + blr x0 + + stp x0, xzr, [sp, #-16]! + cmp x0, #0 + b.eq .L_exit + + // x0 != 0 => parent process. Clear stack shadow. + add x0, sp, #16 + bl COMMON_INTERCEPTOR_HANDLE_VFORK + +.L_exit: + // Restore x30. + bl COMMON_INTERCEPTOR_SPILL_AREA + ldr x30, [x0] + ldp x0, xzr, [sp], 16 + + ret +ASM_SIZE(vfork) + +.weak vfork +.set vfork, ASM_WRAPPER_NAME(vfork) + +#endif |