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libsframe: use offsets to FDE and FRE sub-sections

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In SFrame format, the SFrame FDEs begin at an offset 'sfh_fdeoff' from
the end of the SFrame header.  Similarly, the SFrame FREs begin at an
offset 'sfh_freoff' from the end of the SFrame header.

While the GNU assembler generates these subsections such that sfd_fdeoff
is zero, the correct way to decode the SFrame section (conforming with
the specification) is to use both sfh_fdeoff and sfh_freoff in
sframe_decode.

libsframe/
	* sframe.c (sframe_decode): Use offsets to SFrame FDE and FRE
	sub-sections as applicable.
This commit is contained in:
Indu Bhagat
2025-08-23 12:09:44 -07:00
parent c8a03d6406
commit 0d90e0ce80
1 changed files with 6 additions and 4 deletions
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10
libsframe/sframe.c
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@@ -969,12 +969,11 @@ sframe_decode (const char *sf_buf, size_t sf_size, int *errp)
sframe_ret_set_errno (errp, SFRAME_ERR_NOMEM);
goto decode_fail_free;
}
memcpy (dctx->sfd_funcdesc, frame_buf, fidx_size);
/* SFrame FDEs are at an offset of sfh_fdeoff from SFrame header end. */
memcpy (dctx->sfd_funcdesc, frame_buf + sfheaderp->sfh_fdeoff, fidx_size);
debug_printf ("%u total fidx size\n", fidx_size);
frame_buf += (fidx_size);
/* Handle the SFrame Frame Row Entry section. */
dctx->sfd_fres = (char *) malloc (sfheaderp->sfh_fre_len);
if (dctx->sfd_fres == NULL)
@@ -982,7 +981,10 @@ sframe_decode (const char *sf_buf, size_t sf_size, int *errp)
sframe_ret_set_errno (errp, SFRAME_ERR_NOMEM);
goto decode_fail_free;
}
memcpy (dctx->sfd_fres, frame_buf, sfheaderp->sfh_fre_len);
/* SFrame FREs are at an offset of sfh_freoff from SFrame header end. */
memcpy (dctx->sfd_fres,
frame_buf + sfheaderp->sfh_freoff,
sfheaderp->sfh_fre_len);
fre_bytes = sfheaderp->sfh_fre_len;
dctx->sfd_fre_nbytes = fre_bytes;