bfd: Handle bmmap failure in _bfd_mmap_read_temporary
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Commit Message
bmmap may return MAP_FAILED. _bfd_mmap_readonly_temporary returns
MAP_FAILED when called from GDB on an object with opncls_iovec. Update
_bfd_mmap_read_temporary to handle bmmap failure.
* libbfd.c (_bfd_mmap_read_temporary): Handle bmmap failure.
---
bfd/libbfd.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
Comments
On Wed, Apr 03, 2024 at 03:37:44PM -0700, H.J. Lu wrote:
> bmmap may return MAP_FAILED. _bfd_mmap_readonly_temporary returns
> MAP_FAILED when called from GDB on an object with opncls_iovec. Update
> _bfd_mmap_read_temporary to handle bmmap failure.
>
> * libbfd.c (_bfd_mmap_read_temporary): Handle bmmap failure.
> ---
> bfd/libbfd.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/bfd/libbfd.c b/bfd/libbfd.c
> index 869f0ed5c66..34197b75b5e 100644
> --- a/bfd/libbfd.c
> +++ b/bfd/libbfd.c
> @@ -1207,7 +1207,11 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
> {
> data = _bfd_mmap_readonly_temporary (abfd, size, mmap_base,
> size_p);
> - if (data == NULL || data == MAP_FAILED)
> + /* MAP_FAILED is returned when called from GDB on an object with
> + opncls_iovec. Use bfd_read in this case. */
> + if (data == MAP_FAILED)
> + goto mmap_failed;
> + if (data == NULL)
> abort ();
> *data_p = data;
> return true;
> @@ -1216,6 +1220,7 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
>
> if (data == NULL)
> {
> +mmap_failed:
Will this give an unused label warning when !USE_MMAP? I'm sure you
can rewrite the patch without needing a label if you use another temp
rather than "data" inside the use_mmap block. That would be a good
idea anyway as it saves anyone wondering whether the !final_link case
can have "data" non-NULL and thus malloc is not needed.
> data = bfd_malloc (size);
> if (data == NULL)
> return false;
> --
> 2.44.0
On Thu, Apr 4, 2024 at 12:15 AM Alan Modra <amodra@gmail.com> wrote:
>
> On Wed, Apr 03, 2024 at 03:37:44PM -0700, H.J. Lu wrote:
> > bmmap may return MAP_FAILED. _bfd_mmap_readonly_temporary returns
> > MAP_FAILED when called from GDB on an object with opncls_iovec. Update
> > _bfd_mmap_read_temporary to handle bmmap failure.
> >
> > * libbfd.c (_bfd_mmap_read_temporary): Handle bmmap failure.
> > ---
> > bfd/libbfd.c | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/bfd/libbfd.c b/bfd/libbfd.c
> > index 869f0ed5c66..34197b75b5e 100644
> > --- a/bfd/libbfd.c
> > +++ b/bfd/libbfd.c
> > @@ -1207,7 +1207,11 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
> > {
> > data = _bfd_mmap_readonly_temporary (abfd, size, mmap_base,
> > size_p);
> > - if (data == NULL || data == MAP_FAILED)
> > + /* MAP_FAILED is returned when called from GDB on an object with
> > + opncls_iovec. Use bfd_read in this case. */
> > + if (data == MAP_FAILED)
> > + goto mmap_failed;
> > + if (data == NULL)
> > abort ();
> > *data_p = data;
> > return true;
> > @@ -1216,6 +1220,7 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
> >
> > if (data == NULL)
> > {
> > +mmap_failed:
>
> Will this give an unused label warning when !USE_MMAP? I'm sure you
> can rewrite the patch without needing a label if you use another temp
> rather than "data" inside the use_mmap block. That would be a good
> idea anyway as it saves anyone wondering whether the !final_link case
> can have "data" non-NULL and thus malloc is not needed.
>
The v2 patch:
https://sourceware.org/pipermail/binutils/2024-April/133374.html
@@ -1207,7 +1207,11 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
{
data = _bfd_mmap_readonly_temporary (abfd, size, mmap_base,
size_p);
- if (data == NULL || data == MAP_FAILED)
+ /* MAP_FAILED is returned when called from GDB on an object with
+ opncls_iovec. Use bfd_read in this case. */
+ if (data == MAP_FAILED)
+ goto mmap_failed;
+ if (data == NULL)
abort ();
*data_p = data;
return true;
@@ -1216,6 +1220,7 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
if (data == NULL)
{
+mmap_failed:
data = bfd_malloc (size);
if (data == NULL)
return false;