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daemon: Try to execute derivation builders only for matching OS kernels.

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Fixes <https://bugs.gnu.org/43668>.

Previously, guix-daemon would try to run GNU/Hurd executables on
GNU/Linux.  execve(2) would succeed, but the executable would
immediately crash.

This change prevents it from attempting to execute "i586-gnu" code on
"*-linux", while preserving the binfmt_misc-friendly behavior
implemented in commit 7bf2a70a4f.

* nix/libstore/build.cc (sameOperatingSystemKernel): New function.
(DerivationGoal::runChild): Call 'execve' only when
'sameOperatingSystemKernel' returns true.
This commit is contained in:
Ludovic Courtès 2020-10-01 11:17:12 +02:00
parent 905a2ff0c5
commit 9556ac498f
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GPG key ID: 090B11993D9AEBB5
1 changed files with 23 additions and 3 deletions
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26
nix/libstore/build.cc
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@ -1946,6 +1946,15 @@ void DerivationGoal::startBuilder()
}
/* Return true if the operating system kernel part of SYSTEM1 and SYSTEM2 (the
bit that comes after the hyphen in system types such as "i686-linux") is
the same. */
static bool sameOperatingSystemKernel(const std::string& system1, const std::string& system2)
{
auto os1 = system1.substr(system1.find("-"));
auto os2 = system2.substr(system2.find("-"));
return os1 == os2;
}
void DerivationGoal::runChild()
{
@ -2208,9 +2217,20 @@ void DerivationGoal::runChild()
foreach (Strings::iterator, i, drv.args)
args.push_back(rewriteHashes(*i, rewritesToTmp));
execve(drv.builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
int error = errno;
/* If DRV targets the same operating system kernel, try to execute it:
there might be binfmt_misc set up for user-land emulation of other
architectures. However, if it targets a different operating
system--e.g., "i586-gnu" vs. "x86_64-linux"--do not try executing
it: the ELF file for that OS is likely indistinguishable from a
native ELF binary and it would just crash at run time. */
int error;
if (sameOperatingSystemKernel(drv.platform, settings.thisSystem)) {
execve(drv.builder.c_str(), stringsToCharPtrs(args).data(),
stringsToCharPtrs(envStrs).data());
error = errno;
} else {
error = ENOEXEC;
}
/* Right platform? Check this after we've tried 'execve' to allow for
transparent emulation of different platforms with binfmt_misc