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| author | Efraim Flashner <efraim@flashner.co.il> | 2017-02-14 21:48:30 +0200 |
|---|---|---|
| committer | Efraim Flashner <efraim@flashner.co.il> | 2017-02-20 12:58:06 +0200 |
| commit | 77e16733197b8950f6b665be1f69375cb2a7155f (patch) | |
| tree | e939354807138560f721b5d5090f10604fd97c98 | |
| parent | 653add37af10b0d5dbc20c8bc7ce30eec8cf4ae7 (diff) | |
| download | guix-77e16733197b8950f6b665be1f69375cb2a7155f.tar guix-77e16733197b8950f6b665be1f69375cb2a7155f.tar.gz | |
daemon: Ensure proper alignment on the stack.
* nix/libstore/build.cc (startBuilder): When calling 'clone', increase
the step to 16 and ensure it aligns properly on the stack.
| -rw-r--r-- | nix/libstore/build.cc | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc index cebc404d1c..9b7bb5391c 100644 --- a/nix/libstore/build.cc +++ b/nix/libstore/build.cc @@ -26,6 +26,7 @@ #include <errno.h> #include <stdio.h> #include <cstring> +#include <stdint.h> #include <pwd.h> #include <grp.h> @@ -2008,7 +2009,11 @@ void DerivationGoal::startBuilder() char stack[32 * 1024]; int flags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | SIGCHLD; if (!fixedOutput) flags |= CLONE_NEWNET; - pid = clone(childEntry, stack + sizeof(stack) - 8, flags, this); + + /* Ensure proper alignment on the stack. On aarch64, it has to be 16 + bytes. */ + pid = clone(childEntry, (char *)(((uintptr_t)stack + 16) & ~0xf), + flags, this); if (pid == -1) throw SysError("cloning builder process"); } else |