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debug: correctly detect missing entries in .eh_frame_hdr

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This commit is contained in:
Jacob Young 2025-05-12 19:03:04 -04:00
parent 025611629f
commit 4adb7eca6a
2 changed files with 4 additions and 2 deletions
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4
lib/std/debug/Dwarf.zig
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@ -402,7 +402,7 @@ pub const ExceptionFrameHeader = struct {
}
}
if (len == 0) return bad();
if (len == 0) return missing();
fbr.pos = left * entry_size;
// Read past the pc_begin field of the entry
@ -460,6 +460,8 @@ pub const ExceptionFrameHeader = struct {
@sizeOf(usize),
native_endian,
);
if (pc < fde.pc_begin or pc >= fde.pc_begin + fde.pc_range) return missing();
}
};

2
lib/std/debug/SelfInfo.zig
View File

@ -1633,7 +1633,7 @@ pub fn unwindFrameDwarf(
&cie,
&fde,
) catch |err| switch (err) {
error.InvalidDebugInfo => {
error.MissingDebugInfo => {
// `.eh_frame_hdr` appears to be incomplete, so go ahead and populate `cie_map`
// and `fde_list`, and fall back to the binary search logic below.
try di.scanCieFdeInfo(allocator, base_address);