diff options
| author | Ingo Molnar <mingo@kernel.org> | 2021-03-18 17:27:03 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-03-18 17:27:03 +0300 |
| commit | 14ff3ed86e2c1700345f411b90a78f62867f217e (patch) | |
| tree | 0eec583be82296fa6359edb59f2921095eef0dc2 /mm/madvise.c | |
| parent | 81519f778830d1ab02274eeaaeab6797fdc4ec52 (diff) | |
| parent | 1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff) | |
| download | linux-14ff3ed86e2c1700345f411b90a78f62867f217e.tar.xz | |
Merge tag 'v5.12-rc3' into x86/cleanups, to refresh the tree
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index df692d2e35d4..01fef79ac761 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -1198,12 +1198,22 @@ SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec, goto release_task; } - mm = mm_access(task, PTRACE_MODE_ATTACH_FSCREDS); + /* Require PTRACE_MODE_READ to avoid leaking ASLR metadata. */ + mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); if (IS_ERR_OR_NULL(mm)) { ret = IS_ERR(mm) ? PTR_ERR(mm) : -ESRCH; goto release_task; } + /* + * Require CAP_SYS_NICE for influencing process performance. Note that + * only non-destructive hints are currently supported. + */ + if (!capable(CAP_SYS_NICE)) { + ret = -EPERM; + goto release_mm; + } + total_len = iov_iter_count(&iter); while (iov_iter_count(&iter)) { @@ -1218,6 +1228,7 @@ SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec, if (ret == 0) ret = total_len - iov_iter_count(&iter); +release_mm: mmput(mm); release_task: put_task_struct(task); |