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libsframe: correct binary search for SFrame FDE

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sframe_get_funcdesc_with_addr_internal erroneously returns the last FDE,
if its function start address is lower than the searched for address.

Simplify the binary search for a SFrame FDE for a given address.  Only
return an FDE, if the searched for address is within the bounds of the
FDE function start address and function size.

libsframe/
	* sframe.c (sframe_get_funcdesc_with_addr_internal): Correct
	binary search for SFrame FDE.

libsframe/testsuite/
	* libsframe.find/plt-findfre-1.c: Add test for out of range
	PLT6.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
This commit is contained in:
Jens Remus
2025-05-26 11:01:14 -07:00
committed by Indu Bhagat
parent f0d72d3508
commit 9d2a24349e
2 changed files with 11 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
libsframe/sframe.c
View File

@@ -1023,7 +1023,7 @@ sframe_get_funcdesc_with_addr_internal (sframe_decoder_ctx *ctx, int32_t addr,
{
sframe_header *dhp;
sframe_func_desc_entry *fdp;
int low, high, cnt;
int low, high;
if (ctx == NULL)
return sframe_ret_set_errno (errp, SFRAME_ERR_INVAL);
@@ -1041,22 +1041,19 @@ sframe_get_funcdesc_with_addr_internal (sframe_decoder_ctx *ctx, int32_t addr,
fdp = (sframe_func_desc_entry *) ctx->sfd_funcdesc;
low = 0;
high = dhp->sfh_num_fdes;
cnt = high;
while (low <= high)
{
int mid = low + (high - low) / 2;
if (fdp[mid].sfde_func_start_address == addr)
/* Given sfde_func_start_address <= addr,
addr - sfde_func_start_address must be positive. */
if (fdp[mid].sfde_func_start_address <= addr
&& ((uint32_t)(addr - fdp[mid].sfde_func_start_address)
< fdp[mid].sfde_func_size))
return fdp + mid;
if (fdp[mid].sfde_func_start_address < addr)
{
if (mid == (cnt - 1)) /* Check if it's the last one. */
return fdp + (cnt - 1);
else if (fdp[mid+1].sfde_func_start_address > addr)
return fdp + mid;
low = mid + 1;
}
low = mid + 1;
else
high = mid - 1;
}

4
libsframe/testsuite/libsframe.find/plt-findfre-1.c
View File

@@ -128,6 +128,10 @@ void test_plt_findfre (uint32_t plt_vaddr, uint32_t sframe_vaddr)
TEST ("plt-findfre-1: Find last FRE in PLT4",
(err == 0 && sframe_fre_get_cfa_offset (dctx, &frep, &err) == 0x3));
/* Find no FRE for out of range PLT6. */
err = sframe_find_fre (dctx, (plt_vaddr + 16*5 + 0x0 - sframe_vaddr), &frep);
TEST ("plt-findfre-1: Find no FRE for out of range PLT6", err != 0);
sframe_encoder_free (&ectx);
sframe_decoder_free (&dctx);
}