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author | Cristian Marussi <cristian.marussi@arm.com> | 2019-10-25 18:57:12 +0100 |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2019-11-08 11:10:42 +0000 |
commit | 6c2aa4284513585e9cc0c25b125ab4d57ef4ce76 (patch) | |
tree | 6b1dfe2fe94b6056691598a53677557f06feb91b /tools/testing/selftests/arm64/signal/testcases/testcases.c | |
parent | kselftest: arm64: add helper get_current_context (diff) | |
download | linux-dev-6c2aa4284513585e9cc0c25b125ab4d57ef4ce76.tar.xz linux-dev-6c2aa4284513585e9cc0c25b125ab4d57ef4ce76.zip |
kselftest: arm64: fake_sigreturn_bad_magic
Add a simple fake_sigreturn testcase which builds a ucontext_t with a bad
magic header and place it onto the stack. Expects a SIGSEGV on test PASS.
Introduce a common utility assembly trampoline function to invoke a
sigreturn while placing the provided sigframe at wanted alignment and
also an helper to make space when needed inside the sigframe reserved
area.
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'tools/testing/selftests/arm64/signal/testcases/testcases.c')
-rw-r--r-- | tools/testing/selftests/arm64/signal/testcases/testcases.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/signal/testcases/testcases.c b/tools/testing/selftests/arm64/signal/testcases/testcases.c index 1914a01222a1..e3521949b800 100644 --- a/tools/testing/selftests/arm64/signal/testcases/testcases.c +++ b/tools/testing/selftests/arm64/signal/testcases/testcases.c @@ -148,3 +148,49 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) return true; } + +/* + * This function walks through the records inside the provided reserved area + * trying to find enough space to fit @need_sz bytes: if not enough space is + * available and an extra_context record is present, it throws away the + * extra_context record. + * + * It returns a pointer to a new header where it is possible to start storing + * our need_sz bytes. + * + * @shead: points to the start of reserved area + * @need_sz: needed bytes + * @resv_sz: reserved area size in bytes + * @offset: if not null, this will be filled with the offset of the return + * head pointer from @shead + * + * @return: pointer to a new head where to start storing need_sz bytes, or + * NULL if space could not be made available. + */ +struct _aarch64_ctx *get_starting_head(struct _aarch64_ctx *shead, + size_t need_sz, size_t resv_sz, + size_t *offset) +{ + size_t offs = 0; + struct _aarch64_ctx *head; + + head = get_terminator(shead, resv_sz, &offs); + /* not found a terminator...no need to update offset if any */ + if (!head) + return head; + if (resv_sz - offs < need_sz) { + fprintf(stderr, "Low on space:%zd. Discarding extra_context.\n", + resv_sz - offs); + head = get_header(shead, EXTRA_MAGIC, resv_sz, &offs); + if (!head || resv_sz - offs < need_sz) { + fprintf(stderr, + "Failed to reclaim space on sigframe.\n"); + return NULL; + } + } + + fprintf(stderr, "Available space:%zd\n", resv_sz - offs); + if (offset) + *offset = offs; + return head; +} |