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malloc: Decorate malloc maps

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Add anonymous mmap annotations on loader malloc, malloc when it
allocates memory with mmap, and on malloc arena.  The /proc/self/maps
will now print:

   [anon: glibc: malloc arena]
   [anon: glibc: malloc]
   [anon: glibc: loader malloc]

On arena allocation, glibc annotates only the read/write mapping.

Checked on x86_64-linux-gnu and aarch64-linux-gnu.
Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella
2023-11-01 09:56:08 -03:00
parent 6afce56c19
commit fee9e40a8d
6 changed files with 55 additions and 0 deletions
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2
elf/dl-minimal-malloc.c
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@@ -26,6 +26,7 @@
#include <string.h>
#include <ldsodefs.h>
#include <malloc/malloc-internal.h>
#include <setvmaname.h>
static void *alloc_ptr, *alloc_end, *alloc_last_block;
@@ -60,6 +61,7 @@ __minimal_malloc (size_t n)
MAP_ANON|MAP_PRIVATE, -1, 0);
if (page == MAP_FAILED)
return NULL;
__set_vma_name (page, nup, " glibc: loader malloc");
if (page != alloc_end)
alloc_ptr = page;
alloc_end = page + nup;