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Kernel+LibC: Introduce a "dumpable" flag for processes

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This new flag controls two things:
- Whether the kernel will generate core dumps for the process
- Whether the EUID:EGID should own the process's files in /proc

Processes are automatically made non-dumpable when their EUID or EGID is
changed, either via syscalls that specifically modify those ID's, or via
sys$execve(), when a set-uid or set-gid program is executed.

A process can change its own dumpable flag at any time by calling the
new sys$prctl(PR_SET_DUMPABLE) syscall.

Fixes #4504.
This commit is contained in:
Andreas Kling 2020-12-25 18:27:42 +01:00
parent 3c9bd911b8
commit 82f86e35d6
Notes: sideshowbarker 2024-07-19 00:36:28 +09:00
13 changed files with 199 additions and 7 deletions
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3
Kernel/Ptrace.cpp
View file

@ -59,6 +59,9 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
|| (peer->process().uid() != peer->process().euid())) // Disallow tracing setuid processes
return KResult(-EACCES);
if (!peer->process().is_dumpable())
return KResult(-EACCES);
auto& peer_process = peer->process();
if (params.request == PT_ATTACH) {
if (peer_process.tracer()) {