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[v3,bpf] lib/buildid: handle memfd_secret() files in build_id_parse()

Message ID 20241017174713.2157873-1-andrii@kernel.org (mailing list archive)
State Accepted
Commit 5ac9b4e935dfc6af41eee2ddc21deb5c36507a9f
Delegated to: BPF
Headers show
Series [v3,bpf] lib/buildid: handle memfd_secret() files in build_id_parse() | expand

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Commit Message

Andrii Nakryiko Oct. 17, 2024, 5:47 p.m. UTC 
From memfd_secret(2) manpage:

  The memory areas backing the file created with memfd_secret(2) are
  visible only to the processes that have access to the file descriptor.
  The memory region is removed from the kernel page tables and only the
  page tables of the processes holding the file descriptor map the
  corresponding physical memory. (Thus, the pages in the region can't be
  accessed by the kernel itself, so that, for example, pointers to the
  region can't be passed to system calls.)

We need to handle this special case gracefully in build ID fetching
code. Return -EFAULT whenever secretmem file is passed to build_id_parse()
family of APIs. Original report and repro can be found in [0].

  [0] https://lore.kernel.org/bpf/ZwyG8Uro%2FSyTXAni@ly-workstation/

Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Reported-by: Yi Lai <yi1.lai@intel.com>
Suggested-by: Shakeel Butt <shakeel.butt@linux.dev>
Fixes: de3ec364c3c3 ("lib/buildid: add single folio-based file reader abstraction")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 lib/buildid.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

patchwork-bot+netdevbpf@kernel.org Oct. 17, 2024, 7:40 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Thu, 17 Oct 2024 10:47:13 -0700 you wrote:
> From memfd_secret(2) manpage:
> 
>   The memory areas backing the file created with memfd_secret(2) are
>   visible only to the processes that have access to the file descriptor.
>   The memory region is removed from the kernel page tables and only the
>   page tables of the processes holding the file descriptor map the
>   corresponding physical memory. (Thus, the pages in the region can't be
>   accessed by the kernel itself, so that, for example, pointers to the
>   region can't be passed to system calls.)
> 
> [...]

Here is the summary with links:
  - [v3,bpf] lib/buildid: handle memfd_secret() files in build_id_parse()
    https://git.kernel.org/bpf/bpf/c/5ac9b4e935df

You are awesome, thank you!
diff mbox series

Patch

diff --git a/lib/buildid.c b/lib/buildid.c
index 290641d92ac1..c4b0f376fb34 100644
--- a/lib/buildid.c
+++ b/lib/buildid.c
@@ -5,6 +5,7 @@ 
 #include <linux/elf.h>
 #include <linux/kernel.h>
 #include <linux/pagemap.h>
+#include <linux/secretmem.h>
 
 #define BUILD_ID 3
 
@@ -64,6 +65,10 @@  static int freader_get_folio(struct freader *r, loff_t file_off)
 
 	freader_put_folio(r);
 
+	/* reject secretmem folios created with memfd_secret() */
+	if (secretmem_mapping(r->file->f_mapping))
+		return -EFAULT;
+
 	r->folio = filemap_get_folio(r->file->f_mapping, file_off >> PAGE_SHIFT);
 
 	/* if sleeping is allowed, wait for the page, if necessary */