From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- tools/perf/util/srcline.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 tools/perf/util/srcline.h (limited to 'tools/perf/util/srcline.h') diff --git a/tools/perf/util/srcline.h b/tools/perf/util/srcline.h new file mode 100644 index 000000000..1018cbc88 --- /dev/null +++ b/tools/perf/util/srcline.h @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef PERF_SRCLINE_H +#define PERF_SRCLINE_H + +#include +#include +#include + +struct dso; +struct symbol; + +extern bool srcline_full_filename; +char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, + bool show_sym, bool show_addr, u64 ip); +char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, + bool show_sym, bool show_addr, bool unwind_inlines, + u64 ip); +void zfree_srcline(char **srcline); +char *get_srcline_split(struct dso *dso, u64 addr, unsigned *line); + +/* insert the srcline into the DSO, which will take ownership */ +void srcline__tree_insert(struct rb_root_cached *tree, u64 addr, char *srcline); +/* find previously inserted srcline */ +char *srcline__tree_find(struct rb_root_cached *tree, u64 addr); +/* delete all srclines within the tree */ +void srcline__tree_delete(struct rb_root_cached *tree); + +extern char *srcline__unknown; +#define SRCLINE_UNKNOWN srcline__unknown + +#define MAX_INLINE_NEST 1024 + +struct inline_list { + struct symbol *symbol; + char *srcline; + struct list_head list; +}; + +struct inline_node { + u64 addr; + struct list_head val; + struct rb_node rb_node; +}; + +/* parse inlined frames for the given address */ +struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr, + struct symbol *sym); +/* free resources associated to the inline node list */ +void inline_node__delete(struct inline_node *node); +void inline_node__clear_frames(struct inline_node *node); + +/* insert the inline node list into the DSO, which will take ownership */ +void inlines__tree_insert(struct rb_root_cached *tree, + struct inline_node *inlines); +/* find previously inserted inline node list */ +struct inline_node *inlines__tree_find(struct rb_root_cached *tree, u64 addr); +/* delete all nodes within the tree of inline_node s */ +void inlines__tree_delete(struct rb_root_cached *tree); + +int inline_list__append(struct symbol *symbol, char *srcline, struct inline_node *node); +int inline_list__append_tail(struct symbol *symbol, char *srcline, struct inline_node *node); +char *srcline_from_fileline(const char *file, unsigned int line); +struct symbol *new_inline_sym(struct dso *dso, + struct symbol *base_sym, + const char *funcname); + +int addr2line_configure(const char *var, const char *value, void *cb); + +#endif /* PERF_SRCLINE_H */ -- cgit v1.3.1