Patch "perf unwind-libunwind: Fix base address for .eh_frame" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    perf unwind-libunwind: Fix base address for .eh_frame

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-unwind-libunwind-fix-base-address-for-.eh_frame.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ed6f95cdb9b9a90c73855d336fe47b834d9ade4f
Author: Namhyung Kim <namhyung@xxxxxxxxxx>
Date:   Mon Dec 11 23:05:46 2023 -0800

    perf unwind-libunwind: Fix base address for .eh_frame
    
    [ Upstream commit 4fb54994b2360ab5029ee3a959161f6fe6bbb349 ]
    
    The base address of a DSO mapping should start at the start of the file.
    Usually DSOs are mapped from the pgoff 0 so it doesn't matter when it
    uses the start of the map address.
    
    But generated DSOs for JIT codes doesn't start from the 0 so it should
    subtract the offset to calculate the .eh_frame table offsets correctly.
    
    Fixes: dc2cf4ca866f5715 ("perf unwind: Fix segbase for ld.lld linked objects")
    Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
    Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
    Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
    Cc: Fangrui Song <maskray@xxxxxxxxxx>
    Cc: Ingo Molnar <mingo@xxxxxxxxxx>
    Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
    Cc: Milian Wolff <milian.wolff@xxxxxxxx>
    Cc: Pablo Galindo <pablogsal@xxxxxxxxx>
    Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20231212070547.612536-4-namhyung@xxxxxxxxxx
    Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
index c0641882fd2f..5e5c3395a499 100644
--- a/tools/perf/util/unwind-libunwind-local.c
+++ b/tools/perf/util/unwind-libunwind-local.c
@@ -327,7 +327,7 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct unwind_info *ui,
 
 	maps__for_each_entry(thread__maps(ui->thread), map_node) {
 		struct map *map = map_node->map;
-		u64 start = map__start(map);
+		u64 start = map__start(map) - map__pgoff(map);
 
 		if (map__dso(map) == dso && start < base_addr)
 			base_addr = start;