The patch titled
Subject: coredump: also dump first pages of non-executable ELF libraries
has been added to the -mm tree. Its filename is
coredump-also-dump-first-pages-of-non-executable-elf-libraries.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/coredump-also-dump-first-pages-of-non-executable-elf-libraries.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/coredump-also-dump-first-pages-of-non-executable-elf-libraries.patch
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------------------------------------------------------
From: Jann Horn <jannh@xxxxxxxxxx>
Subject: coredump: also dump first pages of non-executable ELF libraries
When I rewrote the VMA dumping logic for coredumps, I changed it to
recognize ELF library mappings based on the file being executable instead
of the mapping having an ELF header. But turns out, distros ship many ELF
libraries as non-executable, so the heuristic goes wrong...
Restore the old behavior where FILTER(ELF_HEADERS) dumps the first page of
any offset-0 readable mapping that starts with the ELF magic.
This fix is technically layer-breaking a bit, because it checks for
something ELF-specific in fs/coredump.c; but since we probably want to
share this between standard ELF and FDPIC ELF anyway, I guess it's fine?
And this also keeps the change small for backporting.
Link: https://lkml.kernel.org/r/20220126025739.2014888-1-jannh@xxxxxxxxxx
Fixes: 429a22e776a2 ("coredump: rework elf/elf_fdpic vma_dump_size() into c=
ommon helper")
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
Reported-by: Bill Messmer <wmessmer@xxxxxxxxxxxxx>
Cc: "Eric W . Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/coredump.c | 39 ++++++++++++++++++++++++++++++++++-----
1 file changed, 34 insertions(+), 5 deletions(-)
--- a/fs/coredump.c~coredump-also-dump-first-pages-of-non-executable-elf-libraries
+++ a/fs/coredump.c
@@ -42,6 +42,7 @@
#include <linux/path.h>
#include <linux/timekeeping.h>
#include <linux/sysctl.h>
+#include <linux/elf.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
@@ -980,6 +981,8 @@ static bool always_dump_vma(struct vm_ar
return false;
}
+#define DUMP_SIZE_MAYBE_ELFHDR_PLACEHOLDER 1
+
/*
* Decide how much of @vma's contents should be included in a core dump.
*/
@@ -1039,9 +1042,20 @@ static unsigned long vma_dump_size(struc
* dump the first page to aid in determining what was mapped here.
*/
if (FILTER(ELF_HEADERS) &&
- vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ) &&
- (READ_ONCE(file_inode(vma->vm_file)->i_mode) & 0111) != 0)
- return PAGE_SIZE;
+ vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
+ if ((READ_ONCE(file_inode(vma->vm_file)->i_mode) & 0111) != 0)
+ return PAGE_SIZE;
+
+ /*
+ * ELF libraries aren't always executable.
+ * We'll want to check whether the mapping starts with the ELF
+ * magic, but not now - we're holding the mmap lock,
+ * so copy_from_user() doesn't work here.
+ * Use a placeholder instead, and fix it up later in
+ * dump_vma_snapshot().
+ */
+ return DUMP_SIZE_MAYBE_ELFHDR_PLACEHOLDER;
+ }
#undef FILTER
@@ -1116,8 +1130,6 @@ int dump_vma_snapshot(struct coredump_pa
m->end = vma->vm_end;
m->flags = vma->vm_flags;
m->dump_size = vma_dump_size(vma, cprm->mm_flags);
-
- vma_data_size += m->dump_size;
}
mmap_write_unlock(mm);
@@ -1127,6 +1139,23 @@ int dump_vma_snapshot(struct coredump_pa
return -EFAULT;
}
+ for (i = 0; i < *vma_count; i++) {
+ struct core_vma_metadata *m = (*vma_meta) + i;
+
+ if (m->dump_size == DUMP_SIZE_MAYBE_ELFHDR_PLACEHOLDER) {
+ char elfmag[SELFMAG];
+
+ if (copy_from_user(elfmag, (void __user *)m->start, SELFMAG) ||
+ memcmp(elfmag, ELFMAG, SELFMAG) != 0) {
+ m->dump_size = 0;
+ } else {
+ m->dump_size = PAGE_SIZE;
+ }
+ }
+
+ vma_data_size += m->dump_size;
+ }
+
*vma_data_size_ptr = vma_data_size;
return 0;
}
_
Patches currently in -mm which might be from jannh@xxxxxxxxxx are
coredump-also-dump-first-pages-of-non-executable-elf-libraries.patch
